Professor Yoshi Uchida

Sakai S, Abe K, Bronner C, Hayato Y, Hiraide K, Hosokawa K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Tanaka H, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Yoshida S, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Jang MC, Lee SH, Moon DH, Park RG, Bodur B, Scholberg K, Walter CW, Beauchêne A, Drapier O, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Nakamura T, Jang JS, Machado LN, Learned JG, Choi K, Iovine N, Cao S, Anthony LHV, Martin D, Prouse NW, Scott M, Sztuc AA, Uchida Y, Berardi V, Calabria NF, Catanesi MG, Radicioni E, Langella A, De Rosa G, Collazuol G, Iacob F, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Okazaki R, Akutsu Ret al., 2024, Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment, Physical Review D, Vol: 109, ISSN: 2470-0010

We report the first measurement of the atmospheric neutrino-oxygen neutral-current quasielastic (NCQE) cross section in the gadolinium-loaded Super-Kamiokande (SK) water Cherenkov detector. In June 2020, SK began a new experimental phase, named SK-Gd, by loading 0.011% by mass of gadolinium into the ultrapure water of the SK detector. The introduction of gadolinium to ultrapure water has the effect of improving the neutron-tagging efficiency. Using a 552.2 day dataset from August 2020 to June 2022, we measure the NCQE cross section to be 0.74±0.22(stat)-0.15+0.85(syst)×10-38 cm2/oxygen in the energy range from 160 MeV to 10 GeV, which is consistent with the atmospheric neutrino-flux-averaged theoretical NCQE cross section and the measurement in the SK pure-water phase within the uncertainties. Furthermore, we compare the models of the nucleon-nucleus interactions in water and find that the binary cascade model and the Liège intranuclear cascade model provide a somewhat better fit to the observed data than the Bertini cascade model. Since the atmospheric neutrino-oxygen NCQE reactions are one of the main backgrounds in the search for diffuse supernova neutrino background (DSNB), these new results will contribute to future studies - and the potential discovery - of the DSNB in SK.

• Abstract
• Cite

Abe K, Hayato Y, Hiraide K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Okamoto K, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Xia J, Yoshida S, Megias GD, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Choi K, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Taani M, Zsoldos S, Kotsar Y, Ozaki H, Suzuki AT, Takeuchi Y, Bronner C, Feng J, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tsui KM, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Harada M, Ishino H, Ito S, Kitagawa H, Koshio Y, Nakanishi F, Sakai S, Barr G, Barrow D, Cook L, Samani S, Wark D, Nova F, Yang JY, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Nishijima K, Iwamoto K, Nakagiri K, Nakajima Y, Taniuchi N, Yokoyama M, Martens K, de Perio P, Vagins MR, Kuze M, Izumiyama S, Inomoto M, Ishitsuket al., 2023, Erratum: Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande [Phys. Rev. Lett. 130, 031802 (2023)]., Phys Rev Lett, Vol: 131

This corrects the article DOI: 10.1103/PhysRevLett.130.031802.

• Abstract
• Author Web Link
• Cite

Harada M, Abe K, Bronner C, Hayato Y, Hiraide K, Hosokawa K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Okamoto K, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Yoshida S, Megias GD, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wester T, Bian J, Griskevich NJ, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Lee SH, Moon DH, Park RG, Bodur B, Scholberg K, Walter CW, Beauchene A, Drapier O, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Choi K, Iovine N, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Langella A, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Okazaki R, Akutsu R, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Bhuiyan N, Burton GT, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Xie Z, Zsoldos S, Kotsar Y, Ozaki H, Suzuki AT, Takagi Y, Takeuchi Y, Feng J, Feng L, Hu JR, Hu Z, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tarrant A, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Hino Y, Ishino H, Kitagawa H, Koshio Y, Nakanishi F, Sakai S, Tada T, Tano T, Barr G, Barrow D, Cook L, Samani S, Wark D, Holin A, Nova F, Yang BS, Yang JY, Yoo J, Fannon JEP, Kneale L, Malek M, McElwee JM, Thiesse MD, Thompson LF, Wilson ST, Okazawa H, Kim SB, Kwon E, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Niet al., 2023, Search for Astrophysical Electron Antineutrinos in Super-Kamiokande with 0.01% Gadolinium-loaded Water, ASTROPHYSICAL JOURNAL LETTERS, Vol: 951, ISSN: 2041-8205

• Author Web Link
• Cite
• Citations: 1

Shinoki M, Abe K, Hayato Y, Hiraide K, Hosokawa K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Okamoto K, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Yoshida S, Megias GD, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Lee SH, Moon DH, Park RG, Bodur B, Scholberg K, Walter CW, Beauchene A, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Choi K, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Langella A, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Akutsu R, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Bhuiyan N, Boschi T, Burton GT, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Taani M, Xie Z, Zsoldos S, Kotsar Y, Ozaki H, Suzuki AT, Takeuchi Y, Bronner C, Feng J, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tarrant A, Tsui KM, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Harada M, Ishino H, Ito S, Kitagawa H, Koshio Y, Nakanish F, Sakai S, Barr G, Barrow D, Cook L, Samani S, Wark D, Holin A, Nova F, Yang JY, Yang BS, Yoo J, Fannon JEP, Kneale L, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Kwon E, Seo JW, Yu I, Ichikawa AK, Nakamura Ket al., 2023, Measurement of the cosmogenic neutron yield in Super-Kamiokande with gadolinium loaded water, PHYSICAL REVIEW D, Vol: 107, ISSN: 2470-0010

• Author Web Link
• Cite

Agarwal A, Budd H, Capo J, Chong P, Christodoulou G, Danilov M, Dergacheva A, De Roeck A, Dokania N, Douqa D, Dugas K, Fedotov S, Gwon S, Howell R, Iwamoto K, Jesus-Valls C, Jung CK, Kasetti SP, Khabibullin M, Khotjantsev A, Kikawa T, Kose U, Kudenko Y, Kuribayashi S, Kutter T, Last D, Lin LS, Lin S, Lux T, Manly S, Caicedo DAM, Martynenko S, Matsubara T, Mauger C, McFarland K, McGrew C, Mefodiev A, Mineev O, Nakadaira T, Noah E, Olivier A, Paolone V, Palestini S, Paul-Torres A, Pellegrino R, Ramirez MA, Riccio C, Rondon JR, Sanchez F, Sgalaberna D, Shorrock W, Sitraka A, Siyeon K, Skrobova N, Suvorov S, Teklu A, Tzanov M, Uchida Y, Wret C, Yang G, Yershov N, Yokoyama M, Zilberman Pet al., 2023, Total neutron cross-section measurement on CH with a novel 3D-projection scintillator detector, PHYSICS LETTERS B, Vol: 840, ISSN: 0370-2693

• Author Web Link
• Cite
• Citations: 1

Abe K, Hayato Y, Hiraide K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Okamoto K, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Xia J, Yoshida S, Megias GD, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Choi K, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Taani M, Zsoldos S, Kotsar Y, Ozaki H, Suzuki AT, Takeuchi Y, Bronner C, Feng J, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tsui KM, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Harada M, Ishino H, Ito S, Kitagawa H, Koshio Y, Nakanishi F, Sakai S, Barr G, Barrow D, Cook L, Samani S, Wark D, Nova F, Yang JY, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Nishijima K, Iwamoto K, Nakagiri K, Nakajima Y, Taniuchi N, Yokoyama M, Martens K, de Perio P, Vagins MR, Kuze M, Izumiyama S, Inomoto M, Ishitsuket al., 2023, Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande, PHYSICAL REVIEW LETTERS, Vol: 130, ISSN: 0031-9007

• Author Web Link
• Cite
• Citations: 1

Abe K, Akhlaq N, Akutsu R, Ali A, Alt C, Andreopoulos C, Antonova M, Aoki S, Arihara T, Asada Y, Ashida Y, Atkin ET, Ban S, Barbi M, Barker GJ, Barr G, Barrow D, Batkiewicz-Kwasniak M, Bench F, Berardi V, Berns L, Bhadra S, Blanchet A, Blondel A, Bolognesi S, Bonus T, Bordoni S, Boyd SB, Bravar A, Bronner C, Bron S, Bubak A, Avanzini MB, Calabria NF, Cao S, Carter AJ, Cartwright SL, Catanesi MG, Cervera A, Chakrani J, Cherdack D, Christodoulou G, Cicerchia M, Coleman J, Collazuol G, Cook L, Cudd A, Davydov Y, De Roeck A, De Rosa G, Dealtry T, Delogu CC, Densham C, Dergacheva A, Di Lodovico F, Dolan S, Douqa D, Doyle TA, Drapier O, Duffy KE, Dumarchez J, Dunne P, Dygnarowicz K, Eguchi A, Emery-Schrenk S, Ershova A, Fedotov S, Fernandez P, Finch AJ, Aguirre GAF, Fiorillo G, Friend M, Fujii Y, Fukuda Y, Fusshoeller K, Giganti C, Glagolev V, Gonin M, Goodman EAG, Gorin A, Grassi M, Guigue M, Hadley DR, Haigh JT, Hamacher-Baumann P, Harris DA, Hartz M, Hasegawa T, Hassani S, Hastings NC, Hatzikoutelis A, Hayato Y, Hiramoto A, Hogan M, Holeczek J, Holin A, Holvey TJ, Van NTH, Honjo T, Iacob F, Ichikawa AK, Ikeda M, Ishida T, Ishitsuka M, Israel HT, Ives SJ, Iwamoto K, Izmaylov A, Izumi N, Jakkapu M, Jamieson B, Jenkins SJ, Jesus-Valls C, Jiang JJ, Jonsson P, Jung CK, Jurj PB, Kabirnezhad M, Kaboth AC, Kajita T, Kakuno H, Kameda J, Kasetti SP, Kataoka Y, Katayama Y, Katori T, Kawaue M, Kearns E, Khabibullin M, Khotjantsev A, Kikawa T, Kikutani H, King S, Kisiel J, Knight A, Kobata T, Kobayashi T, Koch L, Kogan G, Konaka A, Kormos LL, Koshio Y, Kostin A, Kowalik K, Kudenko Y, Kuribayashi S, Kurjata R, Kutter T, Kuze M, La Commara M, Labarga L, Lachner K, Lagoda J, Lakshmi SM, James ML, Lamont I, Lamoureux M, Last D, Latham N, Laveder M, Lawe M, Lee Y, Lin C, Lindner T, Lin S-K, Litchfield RP, Liu SL, Longhin A, Long KR, Ludovici L, Lu X, Lux T, Machado LN, Magaletti L, Mahn K, Malek M, Mandal M, Manly S, Marino AD, Marti-Magro L, Martin DGR, Martini M, Martin JF, Maruyama Tet al., 2022, Scintillator ageing of the T2K near detectors fro 2010 to 2021, Journal of Instrumentation, Vol: 17, Pages: 1-36, ISSN: 1748-0221

The T2K experiment widely uses plastic scintillator as a target for neutrino interactions and an active medium for the measurement of charged particles produced in neutrino interactions at its near detector complex. Over 10 years of operation the measured light yield recorded by the scintillator based subsystems has been observed to degrade by 0.9–2.2% per year. Extrapolation of the degradation rate through to 2040 indicates the recorded light yield should remain above the lower threshold used by the current reconstruction algorithms for all subsystems. This will allow the near detectors to continue contributing to important physics measurements during the T2K-II and Hyper-Kamiokande eras. Additionally, work to disentangle the degradation of the plastic scintillator and wavelength shifting fibres shows that the reduction in light yield can be attributed to the ageing of the plastic scintillator. The long component of the attenuation length of the wavelength shifting fibres was observed to degrade by 1.3–5.4% per year, while the short component of the attenuation length did not show any conclusive degradation.

• Abstract
• Publisher Web Link
• Author Web Link
• Open Access Link
• Cite

Matsumoto R, Abe K, Hayato Y, Hiraide K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Okamoto K, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Xia J, Yoshida S, Megias GD, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Choi K, Cao S, Anthony LH, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Taani M, Xie Z, Zsoldos S, Kotsar Y, Ozaki H, Suzuki AT, Takeuchi Y, Yamamoto S, Bronner C, Feng J, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tsui KM, Tarrant A, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Harada M, Ishino H, Ito S, Kitagawa H, Koshio Y, Ma W, Nakanishi F, Sakai S, Barr G, Barrow D, Cook L, Samani S, Wark D, Holin A, Nova F, Yang JY, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Kwon E, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Nishijima K, Koshiba M, Iwamoto K, Nakagiri K, Nakajima Y, Shimaet al., 2022, Search for proton decay via p -> mu(+) K-0 in 0.37 megaton-years exposure of Super-Kamiokande, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 106, Pages: 1-13, ISSN: 1550-2368

We searched for proton decay via p→μ+K0 in 0.37  Mton⋅years of data collected between 1996 and 2018 from the Super-Kamiokande water Cherenkov experiment. The selection criteria were defined separately for K0S and K0L channels. No significant event excess has been observed. As a result of this analysis, which extends the previous search by an additional 0.2  Mton⋅years of exposure and uses an improved event reconstruction, we set a lower limit of 3.6×1033  years on the proton lifetime.

• Abstract
• Publisher Web Link
• Author Web Link
• Open Access Link
• Cite

Mori M, Abe K, Hayato Y, Hiraide K, Ieki K, Ikeda M, Imaizumi S, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakano Y, Nakayama S, Noguchi Y, Okada T, Okamoto K, Orii A, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Tomiya T, Watanabe S, Yano T, Yoshida S, Han S, Kajita T, Okumura K, Tashiro T, Wang X, Xia J, Megias GD, Bravo-Berguno D, Fernandez P, Labarga L, Ospina N, Zaldivar B, Zsoldos S, Pointon BW, Blaszczyk FDM, Kearns E, Raaf JL, Stone JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Mueller TA, Paganini P, Quilain B, Santos AD, Ishizuka T, Nakamura T, Jang JS, Learned JG, Anthony LH, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Maekawa Y, Nishimura Y, Fujisawa C, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Ozaki H, Shiozawa T, Suzuki AT, Takeuchi Y, Yamamoto S, Kotsar Y, Ashida Y, Bronner C, Feng J, Hirota S, Kikawa T, Nakaya T, Wendell RA, Yasutome K, McCauley N, Mehta P, Tsui KM, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Niwa T, Tsukada M, Lagoda J, Lakshmi SM, Mijakowski P, Zalipska J, Mandal M, Prabhu YS, Jiang J, Jung CK, Vilela C, Wilking MJ, Yanagisawa C, Jia M, Hagiwara K, Harada M, Horai T, Ishino H, Ito S, Kitagawa H, Koshio Y, Ma W, Nakanishi F, Piplani N, Sakai S, Barr G, Barrow D, Cook L, Samani S, Wark D, Nova F, Boschi T, Gao J, Goldsack A, Katori T, Di Lodovico F, Migenda J, Taani M, Zsoldos S, Yang JY, Jenkins SJ, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim Set al., 2022, Searching for Supernova Bursts in Super-Kamiokande IV, ASTROPHYSICAL JOURNAL, Vol: 938, ISSN: 0004-637X

• Author Web Link
• Cite
• Citations: 1

Abe K, Haga Y, Hayato Y, Hiraide K, Ieki K, Ikeda M, Imaizumi S, Iyogi K, Kameda J, Kanemura Y, Kataoka Y, Kato Y, Kishimoto Y, Miki S, Mine S, Miura M, Mochizuki T, Moriyama S, Nagao Y, Nakahata M, Nakajima T, Nakano Y, Nakayama S, Okada T, Okamoto K, Orii A, Sato K, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Tasaka S, Tomura T, Ueno K, Watanabe S, Yano T, Yokozawa T, Han S, Irvine T, Kajita T, Kametani I, Kaneyuki K, Lee KP, McLachlan T, Okumura K, Richard E, Tashiro T, Wang R, Xia J, Megias GD, Bravo-Berguno D, Labarga L, Zaldivar B, Goldhaber M, Blaszczyk FDM, Gustafson J, Kachulis C, Kearns E, Raaf JL, Stone JL, Sulak LR, Sussman S, Wan L, Wester T, Pointon BW, Bian J, Carminati G, Elnimr M, Griskevich NJ, Kropp WR, Locke S, Renshaw A, Smy MB, Sobel HW, Takhistov V, Weatherly P, Ganezer KS, Hartfiel BL, Hill J, Keig WE, Hong N, Kim JY, Lim IT, Park RG, Akiri T, Bodur B, Himmel A, Li Z, O'Sullivan E, Scholberg K, Walter CW, Wongjirad T, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Imber J, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Choi K, Learned JG, Matsuno S, Smith SN, Amey J, Anthony LH, Litchfield RP, Ma WY, Marin D, Sztuc AA, Uchida Y, Wascko MO, Berardi V, Catanesi MG, Intonti RA, Radicioni E, Calabria NF, De Rosa G, Machado LN, Collazuol G, Iacob F, Lamoureux M, Ospina N, Ludovici L, Gonin M, Pronost G, Maekawa Y, Nishimura Y, Cao S, Friend M, Hasegawa T, Ishida T, Ishii T, Jakkapu M, Kobayashi T, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Di Lodovico F, Migenda J, Sedgwick SM, Taani M, Zsoldos S, Abe KE, Hasegawa M, Isobe Y, Kotsar Y, Miyabe H, Ozaki H, Shiozawa T, Sugimoto T, Suzuki AT, Takeuchi Y, Yamamoto S, Ali A, Ashida Y, Bronner C, Feng J, Hayashino T, Hiraki T, Hirota S, Huang K, Jiang M, Kikawa T, Mori M, Murakami A, Nakamura K, Nakaya T, Patel ND, Suzuki K, Takahashi S, Tateishi K, Wendell RA, Yasutome K, Fernanet al., 2022, Neutron tagging following atmospheric neutrino events in a water Cherenkov detector, JOURNAL OF INSTRUMENTATION, Vol: 17, ISSN: 1748-0221

• Author Web Link
• Cite
• Citations: 1

Machado LN, Abe K, Hayato Y, Hiraide K, Ieki K, Ikeda M, Kameda J, Kanemura Y, Kaneshima R, Kashiwagi Y, Kataoka Y, Miki S, Mine S, Miura M, Moriyama S, Nakano Y, Nakahata M, Nakayama S, Noguchi Y, Okamoto K, Sato K, Sekiya H, Shiba H, Shimizu K, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, de Perio P, Martens K, Vagins MR, Bian J, Griskevich NJ, Kropp WR, Locke S, Smy MB, Sobel HW, Takhistov V, Yankelevich A, Han S, Kajita T, Okumura K, Tashiro T, Tomiya T, Wang X, Xia J, Yoshida S, Megias GD, Fernandez P, Labarga L, Ospina N, Zaldivar B, Pointon BW, Akutsu R, Gousy-Leblanc V, Hartz M, Konaka A, Prouse NW, Kearns E, Raaf JL, Wan L, Wester T, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Mueller TA, Santos AD, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Cao S, Choi K, Anthony LH, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ludovici L, Gonin M, Pronost G, Fujisawa C, Maekawa Y, Nishimura Y, Sasaki R, Friend M, Hasegawa T, Ishida T, Jakkapu M, Kobayashi T, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Di Lodovico F, Gao J, Goldsack A, Katori T, Migenda J, Taani M, Zsoldos S, Kotsar Y, Ozaki H, Suzuki AT, Takeuchi Y, Yaamoto S, Bronner C, Feng J, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Jenkins SJ, McCauley N, Mehta P, Tsui KM, Fukuda Y, Itow Y, Menjo H, Ninomiya K, Lagoda J, Lakshmi SM, Mandal M, Mijakowski P, Prabhu YS, Zalipska J, Jia M, Jiang J, Jung CK, Wilking MJ, Yanagisawa C, Harada M, Ishino H, Ito S, Kitagawa H, Koshio Y, Ma W, Nakanishi F, Sakai S, Barr G, Barrow D, Cook L, Samani S, Wark D, Nova F, Yang JY, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Seo JW, Yu I, Ichikawa AK, Nakamura KD, Tairafune S, Nishijima Ket al., 2022, Pre-supernova alert system for super-kamiokande, The Astrophysical Journal: an international review of astronomy and astronomical physics, Vol: 935, Pages: 1-14, ISSN: 0004-637X

In 2020, the Super-Kamiokande (SK) experiment moved to a new stage (SK-Gd) in which gadolinium (Gd) sulfate octahydrate was added to the water in the detector, enhancing the efficiency to detect thermal neutrons and consequently improving the sensitivity to low energy electron anti-neutrinos from inverse beta decay (IBD) interactions. SK-Gd has the potential to provide early alerts of incipient core-collapse supernovae through detection of electron anti-neutrinos from thermal and nuclear processes responsible for the cooling of massive stars before the gravitational collapse of their cores. These pre-supernova neutrinos emitted during the silicon burning phase can exceed the energy threshold for IBD reactions. We present the sensitivity of SK-Gd to pre-supernova stars and the techniques used for the development of a pre-supernova alarm based on the detection of these neutrinos in SK, as well as prospects for future SK-Gd phases with higher concentrations of Gd. For the current SK-Gd phase, high-confidence alerts for Betelgeuse could be issued up to 9 hr in advance of the core collapse itself.

• Abstract
• Publisher Web Link
• Author Web Link
• Open Access Link
• Cite

Abe K, Bronner C, Hayato Y, Ikeda M, Imaizumi S, Ito H, Kameda J, Kataoka Y, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakajima Y, Nakayama S, Okada T, Okamoto K, Orii A, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Yano T, Akutsu R, Han S, Kajita T, Okumura K, Tashiro T, Wang R, Xia J, Bravo-Berguño D, Labarga L, Marti L, Zaldivar B, Blaszczyk FDM, Kearns E, Raaf JL, Stone JL, Wan L, Wester T, Pointon BW, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Weatherly P, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, Hedri SE, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Anthony LHV, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Ospina N, Ludovici L, Nishimura Y, Cao S, Friend M, Hasegawa T, Ishida T, Jakkapu M, Kobayashi T, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita Ket al., 2022, Search for solar electron anti-neutrinos due to spin-flavor precession in the Sun with Super-Kamiokande-IV, Astroparticle Physics, Vol: 139, ISSN: 0927-6505

Due to a very low production rate of electron anti-neutrinos (ν̄e) via nuclear fusion in the Sun, a flux of solar ν̄e is unexpected. An appearance of ν̄e in solar neutrino flux opens a new window for the new physics beyond the standard model. In particular, a spin-flavor precession process is expected to convert an electron neutrino into an electron anti-neutrino (νe→ν̄e) when neutrino has a finite magnetic moment. In this work, we have searched for solar ν̄e in the Super-Kamiokande experiment, using neutron tagging to identify their inverse beta decay signature. We identified 78 ν̄e candidates for neutrino energies of 9.3 to 17.3 MeV in 2970.1 live days with a fiducial volume of 22.5 kiloton water (183.0 kton⋅year exposure). The energy spectrum has been consistent with background predictions and we thus derived a 90% confidence level upper limit of 4.7×10−4 on the νe→ν̄e conversion probability in the Sun. We used this result to evaluate the sensitivity of future experiments, notably the Super-Kamiokande Gadolinium (SK-Gd) upgrade.

• Abstract
• Cite
• Citations: 7

Edmonds A, Quirk J, Wong M-L, Alexander D, Bernstein RH, Daniel A, Diociaiuti E, Donghia R, Gillies EL, Hungerford E, Kammel P, Krikler BE, Kuno Y, Lancaster M, Litchfield RP, Miller JP, Palladino A, Repond J, Sato A, Sarra I, Soleti SR, Tishchenko V, Tran NH, Uchida Y, Winter P, Wu Cet al., 2022, Measurement of proton, deuteron, triton, and alpha particle emission after nuclear muon capture on Al, Si, and Ti with the AlCap experiment, Physical Review C: Nuclear Physics, Vol: 105, Pages: 1-21, ISSN: 0556-2813

Background: Heavy charged particles after nuclear muon capture are an important nuclear physics background to the muon-to-electron conversion experiments Mu2e and COMET, which will search for charged lepton flavor violation at an unprecedented level of sensitivity.Purpose: The AlCap experiment aimed to measure the yield and energy spectra of protons, deuterons, tritons, and α particles emitted after the nuclear capture of muons stopped in Al, Si, and Ti in the low-energy range relevant for the muon-to-electron conversion experiments.Methods: Individual charged particle types were identified in layered silicon detector packages and their initial energy distributions were unfolded from the observed energy spectra.Results: The proton yields per muon capture were determined as Yp(Al)=26.64(28stat.)(77syst.)×10−3 and Yp(Ti)=26.48(35)(80)×10−3 in the energy range 3.5–20.0 MeV, and as Yp(Si)=52.5(6)(18)×10−3 in the energy range 4.0–20.0 MeV. Detailed information on yields and energy spectra for all observed nuclei are presented in the paper.Conclusions: The yields in the candidate muon stopping targets, Al and Ti, are approximately half of that in Si, which was used in the past to estimate this background. The reduced background allows for less shielding and a better energy resolution in these experiments. It is anticipated that the comprehensive information presented in this paper will stimulate modern theoretical calculations of the rare process of muon capture with charged particle emission and inform the design of future muon-to-electron conversion experiments.

• Abstract
• Publisher Web Link
• Author Web Link
• Open Access Link
• Cite

Yano T, Abe K, Adrich P, Aihara H, Akutsu R, Alekseev I, Ali A, Alj Hakim YI, Ameli F, Anthony LHV, Araya A, Asaoka Y, Aushev V, Ballester F, Bandac I, Barbi M, Barr G, Batkiewicz-Kwasniak M, Bellato M, Berardi V, Bernard L, Bernardini E, Berns L, Bhadra S, Bian J, Blanchet A, Blondel A, Boiano A, Bolognesi S, Bonavera L, Booth N, Bordoni S, Borjabad S, Boschi T, Bose D, Boyd SB, Bozza C, Bravar A, Bronner C, Brown L, Bubak A, Buchowicz A, Buizza Avanzini M, Cafagna FS, Calabria NF, Calvo-Mozota JM, Cao S, Carroll A, Catanesi MG, Cebriàn S, Chakraborty S, Choi JH, Choubey S, Cicerchia M, Coleman J, Collazuol G, Cuen-Rochin S, Danilov M, Díaz López G, De la Fuente E, de Perio P, De Rosa G, Dealtry T, Densham CJ, Dergacheva A, Deshmukh N, Devi MM, Di Lodovico F, Di Meo P, Di Palma I, Doyle TA, Drakopoulou E, Drapier O, Dumarchez J, Eklund L, El Hedri S, Ellis J, Emery S, Esmaili A, Esteve R, Fedotov S, Feng J, Fernandez P, Fernández-Martinez E, Ferrario P, Ferrazzi B, Finch A, Finley C, Fiorillo G, Fitton M, Friend M, Fujii Y, Fujisawa C, Fukuda Y, Galinski G, Gao J, Garde C, Garfagnini A, Garode S, Gialanella Let al., 2022, Prospects for neutrino astrophysics with Hyper-Kamiokande

Hyper-Kamiokande is a multi-purpose next generation neutrino experiment. The detector is a two-layered cylindrical shape ultra-pure water tank, with its height of 64 m and diameter of 71 m. The inner detector will be surrounded by tens of thousands of twenty-inch photosensors and multi-PMT modules to detect water Cherenkov radiation due to the charged particles and provide our fiducial volume of 188 kt. This detection technique is established by Kamiokande and Super-Kamiokande. As the successor of these experiments, Hyper-K will be located deep underground, 600 m below Mt. Tochibora at Kamioka in Japan to reduce cosmic-ray backgrounds. Besides our physics program with accelerator neutrino, atmospheric neutrino and proton decay, neutrino astrophysics is an important research topic for Hyper-K. With its fruitful physics research programs, Hyper-K will play a critical role in the next neutrino physics frontier. It will also provide important information via astrophysical neutrino measurements, i.e., solar neutrino, supernova burst neutrinos and supernova relic neutrino. Here, we will discuss the physics potential of Hyper-K neutrino astrophysics.

• Abstract
• Cite

El Hedri S, Ashida Y, Giampaolo A, Abe K, Bronner C, Hayato Y, Hiraide K, Ikeda M, Kameda J, Kanemura Y, Kataoka Y, Miki S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakayama S, Okamoto K, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Xia J, Megias GD, Labarga L, Marti L, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, Gimpaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ospina N, Ludovici L, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Yet al., 2022, Diffuse Supernova Neutrino Background Search at Super-Kamiokande

We present the results of a search for the Diffuse Supernova Neutrino Background (DSNB) at Super-Kamiokande (SK) that incorporates 22.5 × 2970 kton.days of data from its fourth data-taking phase. Two analyses, with different energy regimes covering the 9.3−81.3 MeV antineutrino energy range, have been developed based on previous SK searches, with substantially improved background modeling and data reduction techniques. Moreover, a combined analysis of nearly 20 years of SK data (1996-2018) has been performed, with a 90% C.L. sensitivity to the DSNB flux comparable to various DSNB predictions. No significant evidence for a DSNB signal has been observed, and both analyses set world-leading limits on the DSNB flux that can reach about 2.7νe.cm−2.s−1 for a wide range of models.

• Abstract
• Cite

Giampaolo A, El Hedri S, Abe K, Bronner C, Hayato Y, Hiraide K, Ikeda M, Kameda J, Kanemura Y, Kataoka Y, Miki S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakayama S, Okamoto K, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Xia J, Megias GD, Labarga L, Marti L, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, Giampolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ospina N, Ludovici L, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita Ket al., 2022, Diffuse Supernova Neutrino Background search at Super-Kamiokande with neutron tagging

Detecting the Diffuse Supernova Neutrino Background at Super-Kamiokande requires designing state-of-the-art background removal technique to reject radioactivity induced by cosmic muon spallation, and identify atmospheric neutrino interactions. Identifying the neutron produced by the interaction of DSNB antineutrinos would allow to remove most of these backgrounds, but is particularly challenging in pure water. With the advent of the SK-Gd era, with Gadolinium being dissolved in the SK water, the efficiency of the neutron tagging procedure will increase dramatically, and the SK experiment will make significant gains in its sensitivity to the DSNB. I will present the role of neutron tagging and the challenges it provides, as well as discuss the impact of the SK-Gd project.

• Abstract
• Cite

Pronost G, Abe K, Bronner C, Hayato Y, Hiraide K, Ikeda M, Kameda J, Kanemura Y, Kataoka Y, Miki S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakayama S, Okamoto K, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Xia J, Megias GD, Labarga L, Marti L, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ospina N, Ludovici L, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi Tet al., 2022, Low energy radioactivity BG model in Super-Kamiokande detector from SK-IV data

The radioactivity background are among the most dangerous background for low energy neutrino analysis in Super-Kamiokande (SK), like the solar neutrino analysis. Among them, the main contribution is coming from 222Rn, which is spread in the detector’s water due to the water source and to the photo multiplier (PMT) emanations. Up to now, its exact distribution in the detector was not known. Using our knowledge of the radon concentration in the detector water, and the SK-IV solar data, we developed a model of the radon distribution in the detector. The uncertainty on the Rn concentration associated with this model was estimated to be ∼ 0.1 mBq/m3

• Abstract
• Cite

Kitagawa H, Nakano Y, Koshio Y, Abe K, Bronner C, Hayato Y, Hiraide K, Ikeda M, Kameda J, Kanemura Y, Kataoka Y, Miki S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakayama S, Okamoto K, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Xia J, Megias GD, Labarga L, Marti L, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ospina N, Ludovici L, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Yet al., 2022, Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector

Cosmic-ray muons arise from the showers of secondary particles produced via the interactions of primary cosmic particles with air nuclei at the top of the atmosphere. The interaction products, pions and kaons composing showers mostly decay to muons reflect the details of the hadronic interactions depending on their energy. Measurements of the charge ratio and polarization of cosmic-ray muons can be used to constrain high energy hadronic interaction models in the atmosphere. In this presentation, we will report the current status of the measurement of the charge ratio using data collected by the Super-Kamiokande (SK) detector located at a depth of 2700 m of water equivalent. Using the data taken in the fourth phase of SK (SK-IV), the charge ratio is measured to be 1.42 ± 0.02 (statistical uncertainty only), at the energy of 1.3 TeV. This result for the charge ratio is in good agreement with those previously obtained by deep underground experiments.

• Abstract
• Cite

Abe K, Bronner C, Hayato Y, Hiraide K, Ikeda M, Kameda J, Kanemura Y, Kataoka Y, Miki S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakayama S, Okamoto K, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Xia J, Megias GD, Labarga L, Marti L, Zaldivar B, Pointon BW, Kearns E, Raaf JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Cao S, Anthony LHV, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ospina N, Ludovici L, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto Tet al., 2022, Follow-up of GWTC-2 gravitational wave events with neutrinos from the Super-Kamiokande detector

Super-Kamiokande (SK) is a 50-kt water Cherenkov detector, instrumented with ∼ 13k photo-multipliers and running since 1996. It is sensitive to neutrinos with energies ranging from 4.5 MeV to several TeV. A new framework has been developed for the follow-up of gravitational wave (GW) alerts issued by the LIGO-Virgo collaboration (LVC). Neutrinos are searched for, using a 1000-second time window centered on the alert time and in both SK low-energy and high-energy samples. Such observation can then be used to constrain the neutrino emission from the GW source. The significance of potential signals has been obtained by comparing neutrino direction with the localization of the GW. The computation of limits on incoming neutrino flux and on the total energy emitted in neutrinos by the source has been performed for the different neutrino flavors. The results using the LVC GWTC-2 catalog (covering O3a period) are presented, as well as the outlooks for the future real-time public release of follow-ups for the O4 period (in 2022) and beyond.

• Abstract
• Cite

Abe K, Bronner C, Hayato Y, Hiraide K, Ikeda M, Imaizumi S, Kameda J, Kanemura Y, Kataoka Y, Miki S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakayama S, Okada T, Okamoto K, Orii A, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Xia J, Megias GD, Bravo-Berguno D, Labarga L, Marti L, Zaldivar B, Pointon BW, Blaszczyk FDM, Kearns E, Raaf JL, Stone JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Anthony LH, Martin D, Scott M, Sztuc AA, Uchida Y, Cao S, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ospina N, Ludovici L, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Gao J, Di Lodovico F, Migenda J, Taani M, Zsoldos S, Kotsar Y, Nakano Y, Ozaki H, Shiozawa T, Suzuki AT, Takeuchi Y, Yamamoto S, Ali A, Ashida Y, Feng J, Hirota S, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Fernandez P, McCauley N, Mehta P, Tsui KM, Fukuda Y, Itow Y, Menjo H, Niwa T, Sato K, Tsukada M, Lagoda J, Lakshmi SM, Mijakowski P, Zalipska J, Jiang J, Jung CK, Vilela C, Wilking MJ, Yanagisawa C, Hagiwara K, Harada M, Horai T, Ishino H, Ito S, Kitagawa F, Koshio Y, Ma W, Piplani N, Sakai S, Barr G, Barrow D, Cook L, Goldsack A, Samani S, Wark D, Nova F, Yang JY, Jenkins SJ, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Seo JW, Yu I, Ichikawa AK, Nakamura K, Nishijima K, Koshiba M, Iwamoto K, Nakajima Y, Ogawa N, Yokoyama M, Martens K, Vagins MR, Kuze M, Izumiyama S, Yoshida T, Inomoto M, Ishitsuket al., 2022, First gadolinium loading to Super-Kamiokande, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, Vol: 1027, Pages: 1-15, ISSN: 0168-9002

In order to improve Super-Kamiokande’s neutron detection efficiency and to thereby increase its sensitivity tothe diffuse supernova neutrino background flux, 13 tons of Gd2(SO4)3⋅ 8H2O (gadolinium sulfate octahydrate)was dissolved into the detector’s otherwise ultrapure water from July 14 to August 17, 2020, marking thestart of the SK-Gd phase of operations. During the loading, water was continuously recirculated at a rate of 60m3/h, extracting water from the top of the detector and mixing it with concentrated Gd2(SO4)3⋅ 8H2O solutionto create a 0.02% solution of the Gd compound before injecting it into the bottom of the detector. A clearboundary between the Gd-loaded and pure water was maintained through the loading, enabling monitoring ofthe loading itself and the spatial uniformity of the Gd concentration over the 35 days it took to reach the top ofthe detector. During the subsequent commissioning the recirculation rate was increased to 120 m3/h, resultingin a constant and uniform distribution of Gd throughout the detector and water transparency equivalent tothat of previous pure-water operation periods. Using an Am–Be neutron calibration source the mean neutroncapture time was measured to be 115 ± 1 μs, which corresponds to a Gd concentration of 111 ± 2 ppm, asexpected for this level of Gd loading. This paper describes changes made to the water circulation system for this detector upgrade, the Gd loading procedure, detector commissioning, and the first neutron calibrationmeasurements in SK-Gd.

• Abstract
• Publisher Web Link
• Author Web Link
• Cite

Abe K, Bronner C, Hayato Y, Hiraide K, Ikeda M, Imaizumi S, Kameda J, Kanemura Y, Kataoka Y, Miki S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakayama S, Okada T, Okamoto K, Orii A, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Xia J, Megias GD, Bravo-Berguno D, Labarga L, Marti L, Zaldivar B, Pointon BW, Blaszczyk FDM, Kearns E, Raaf JL, Stone JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Cao S, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Anthony LH, Martin D, Scott M, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Mattiazzi M, Ospina N, Ludovici L, Maekawa Y, Nishimura Y, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Kotsar Y, Nakano Y, Ozaki H, Shiozawa T, Suzuki AT, Takeuchi Y, Yamamoto S, Ali A, Ashida Y, Feng J, Hirota S, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Fernandez P, McCauley N, Mehta P, Tsui KM, Fukuda Y, Itow Y, Menjo H, Niwa T, Sato K, Tsukada M, Lagoda J, Lakshmi SM, Mijakowski P, Zalipska J, Jiang J, Jung CK, Vilela C, Wilking MJ, Yanagisawa C, Hagiwara K, Harada M, Horai T, Ishino H, Ito S, Kitagawa H, Koshio Y, Ma W, Piplani N, Sakai S, Barr G, Barrow D, Cook L, Goldsack A, Samani S, Wark D, Nova F, Boschi T, Di Lodovico F, Gao J, Migenda J, Taani M, Zsoldos S, Yang JY, Jenkins SJ, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Seo JW, Yu I, Nishijima K, Koshiba M, Iwamoto K, Nakagiri K, Nakajima Y, Ogawa N, Yokoyama M, Martens K, Vagins MR, Kuze M, Izumiyama S, Yoshida T, Inomoto M, Ishitsuka M, Ito H Ket al., 2021, Diffuse supernova neutrino background search at Super-Kamiokande, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 104, Pages: 1-41, ISSN: 1550-2368

y, potentialities of the gadolinium phase of SK and the future Hyper-Kamiokande experiment are discussed.

• Abstract
• Publisher Web Link
• Author Web Link
• Open Access Link
• Cite

Abe K, Bronner C, Hayato Y, Ikeda M, Imaizumi S, Ito H, Kameda J, Kataoka Y, Kato Y, Kishimoto Y, Miura M, Moriyama S, Mochizuki T, Nagao Y, Nakahata M, Nakajima Y, Nakayama S, Okada T, Okamoto K, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Wang R, Xia J, Megias GD, Bravo-Berguno D, Labarga L, Marti L, Zaldivar B, Blaszczyk FDM, Kearns E, Raaf JL, Stone JL, Wan L, Wester T, Pointon BW, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Weatherly P, Ganezer KS, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Matsuno S, Anthony LH, Litchfield RP, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Ospina N, Ludovici L, Nishimura Y, Cao S, Friend M, Hasegawa T, Ishida T, Kobayashi T, Jakkapu M, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Boschi T, Di Lodovico F, Sedgwick SM, Taani M, Zsoldos S, Hasegawa M, Isobe Y, Miyabe H, Nakano Y, Shiozawa T, Sugimoto T, Suzuki AT, Takeuchi Y, Yamamoto S, Ali A, Ashida Y, Feng J, Hirota S, Jiang M, Ichikawa AK, Kikawa T, Mori M, Nakamura KE, Nakaya T, Wendell RA, Yasutome K, Fernandez P, McCauley N, Mehta P, Pritchard A, Tsui KM, Fukuda Y, Itow Y, Menjo H, Niwa T, Sato K, Tsukada M, Mijakowski P, Frankiewicz K, Jung CK, Vilela C, Wilking MJ, Yanagisawa C, Fukuda D, Harada M, Hagiwara K, Horai T, Ishino H, Ito S, Koshio Y, Ma W, Piplani N, Sakai S, Sakuda M, Takahira Y, Xu C, Kuno Y, Barr G, Barrow D, Cook L, Goldsack A, Samani S, Simpson C, Wark D, Nova F, Yang JY, Jenkins SJ, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Choi Y, Kim SB, Yu I, Nishijima K, Koshiba M, Iwamoto K, Ogawa N, Yokoyama M, Martenset al., 2021, Search for tens of MeV neutrinos associated with gamma-ray bursts in Super-Kamiokande, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, Vol: 2021, ISSN: 2050-3911

• Author Web Link
• Cite

Abe K, Bronner C, Hayato Y, Ikeda M, Imaizumi S, Kameda J, Kanemura Y, Kataoka Y, Miki S, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakayama S, Okada T, Okamoto K, Orii A, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Watanabe S, Yano T, Han S, Kajita T, Okumura K, Tashiro T, Wang R, Xia J, Megias GD, Bravo-Berguno D, Labarga L, Marti L, Zaldivar B, Pointon BW, Blaszczyk FDM, Kearns E, Raaf JL, Stone JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Weatherly P, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Bernard L, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Anthony LHV, Martin DGR, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Ospina N, Ludovici L, Maekawa Y, Nishimura Y, Cao S, Friend M, Hasegawa T, Ishida T, Jakkapu M, Kobayashi T, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Kotsar Y, Nakano Y, Ozaki H, Shiozawa T, Suzuki AT, Takeuchi Y, Yamamoto S, Ali A, Ashida Y, Feng J, Hirota S, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Fernandez P, McCauley N, Mehta P, Pritchard A, Tsui KM, Fukuda Y, Itow Y, Menjo H, Niwa T, Sato K, Tsukada M, Mijakowski P, Jiang J, Jung CK, Vilela C, Wilking MJ, Yanagisawa C, Hagiwara K, Harada M, Horai T, Ishino H, Ito S, Koshio Y, Kitagawa H, Ma W, Piplani N, Sakai S, Kuno Y, Barr G, Barrow D, Cook L, Goldsack A, Samani S, Simpson C, Wark D, Nova F, Boschi T, Di Lodovico F, Migenda J, Molina Sedgwick S, Taani M, Zsoldos S, Yang JY, Jenkins SJ, Malek M, McElwee JM, Stone O, Thiesse MD, Thompson LF, Okazawa H, Kim SB, Yu I, Nishijima K, Koshiba M, Iwamoto K, Nakajima Y, Ogawa N, Yokoyama M, Martens K, Vagins MR, Izumiyama S, Kuze M, Tanaka M, Yoshida T, Inomoto M, Ishitsuka M, Ito H, Matsumotoet al., 2021, Search for Neutrinos in Coincidence with Gravitational Wave Events from the LIGO-Virgo O3a Observing Run with the Super-Kamiokande Detector, ASTROPHYSICAL JOURNAL, Vol: 918, ISSN: 0004-637X

• Author Web Link
• Cite
• Citations: 3

Abe K, Adrich P, Aihara H, Akutsu R, Alekseev I, Ali A, Ameli F, Anghel I, Anthony LH, Antonova M, Araya A, Asaoka Y, Ashida Y, Aushev V, Ballester F, Bandac I, Barbi M, Barker GJ, Barr G, Batkiewicz-Kwasniak M, Bellato M, Berardi V, Bergevin M, Bernard L, Bernardini E, Berns L, Bhadra S, Bian J, Blanchet A, Blaszczyk FDM, Blondel A, Boiano A, Bolognesi S, Bonavera L, Booth N, Borjabad S, Boschi T, Bose D, Bozza C, Bravar A, Bravo-Berguno D, Bronner C, Brown L, Bubak A, Buchowicz A, Avanzini MB, Cafagna FS, Calabria NF, Calvo-Mozota JM, Cao S, Cartwright SL, Carroll A, Catanesi MG, Cebrian S, Chabera M, Chakraborty S, Checchia C, Choi JH, Choubey S, Cicerchia M, Coleman J, Collazuol G, Cook L, Cowan G, Cuen-Rochin S, Danilov M, Daz Lopez G, De la Fuente E, de Perio P, De Rosa G, Dealtry T, Densham CJ, Dergacheva A, Deshmukh N, Devi MM, Di Lodovico F, Di Meo P, Di Palma I, Doyle TA, Drakopoulou E, Drapier O, Dumarchez J, Dunne P, Dziewiecki M, Eklund L, El Hedri S, Ellis J, Emery S, Esmaili A, Esteve R, Evangelisti A, Feely M, Fedotov S, Feng J, Fernandez P, Fernandez-Martinez E, Ferrario P, Ferrazzi B, Feusels T, Finch A, Finley C, Fiorentini A, Fiorillo G, Fitton M, Frankiewicz K, Friend M, Fujii Y, Fukuda Y, Galinski G, Gao J, Garde C, Garfagnini A, Garode S, Gialanella L, Giganti C, Gomez-Cadenas JJ, Gonin M, Gonzalez-Nuevo J, Gorin A, Gornea R, Gousy-Leblanc V, Gramegna F, Grassi M, Grella G, Guigue M, Gumplinger P, Hadley DR, Harada M, Hartfiel B, Hartz M, Hassani S, Hastings NC, Hayato Y, Hernando-Morata JA, Herrero V, Hill J, Hiraide K, Hirota S, Holin A, Horiuchi S, Hoshina K, Hultqvist K, Iacob F, Ichikawa AK, Ibnsalih WI, Iijima T, Ikeda M, Inomoto M, Inoue K, Insler J, Ioannisian A, Ishida T, Ishidoshiro K, Ishino H, Ishitsuka M, Ito H, Ito S, Itow Y, Iwamoto K, Izmaylov A, Izumi N, Izumiyama S, Jakkapu M, Jamieson B, Jang H, Jang JS, Jenkins SJ, Jeon SH, Jiang M, Jo HS, Jonsson P, Joo KK, Kajita T, Kakuno H, Kameda J, Kano Y, Kalaczynski P, Karlen D, Kaset al., 2021, Supernova Model Discrimination with Hyper-Kamiokande, ASTROPHYSICAL JOURNAL, Vol: 916, ISSN: 0004-637X

• Author Web Link
• Cite
• Citations: 19

Abe K, Akhlaq N, Akutsu R, Ali A, Alt C, Andreopoulos C, Antonova M, Aoki S, Arihara T, Asada Y, Ashida Y, Atkin ET, Awataguchi Y, Barker GJ, Barr G, Barrow D, Batkiewicz-Kwasniak M, Beloshapkin A, Bench F, Berardi V, Berns L, Bhadra S, Blanchet A, Blondel A, Bolognesi S, Bonus T, Bourguille B, Boyd SB, Bravar A, Bravo Berguño D, Bronner C, Bron S, Bubak A, Buizza Avanzini M, Cao S, Cartwright SL, Catanesi MG, Cervera A, Chakrani J, Cherdack D, Christodoulou G, Cicerchia M, Coleman J, Collazuol G, Cook L, Coplowe D, Cudd A, De Rosa G, Dealtry T, Delogu CC, Dennis SR, Densham C, Dergacheva A, Di Lodovico F, Dolan S, Douqa D, Doyle TA, Dumarchez J, Dunne P, Eguchi A, Eklund L, Emery-Schrenk S, Ereditato A, Finch AJ, Fiorillo G, Francois C, Friend M, Fujii Y, Fukuda R, Fukuda Y, Fusshoeller K, Giganti C, Gonin M, Goodman EAG, Gorin A, Grassi M, Guigue M, Hadley DR, Hamacher-Baumann P, Harris DA, Hartz M, Hasegawa T, Hassani S, Hastings NC, Hayato Y, Hiramoto A, Hogan M, Holeczek J, Hong Van NT, Honjo T, Iacob F, Ichikawa AK, Ikeda M, Ishida T, Ishitsuka M, Iwamoto K, Izmaylov A, Izumi N, Jakkapu M, Jamieson B, Jenkins SJ, Jesús-Valls C, Jiang JJ, Jonsson P, Jung CK, Jurj PB, Kabirnezhad M, Kakuno H, Kameda J, Kasetti SP, Kataoka Y, Katayama Y, Katori T, Kearns E, Khabibullin M, Khotjantsev A, Kikawa T, Kikutani H, King S, Kisiel J, Kobata T, Kobayashi T, Koch L, Konaka A, Kormos LL, Koshio Y, Kostin A, Kowalik K, Kudenko Y, Kuribayashi S, Kurjata R, Kutter T, Kuze M, Labarga L, Lagoda J, Lamoureux M, Last D, Laveder M, Lawe M, Lin S-K, Litchfield RP, Liu SL, Longhin A, Ludovici L, Lu X, Lux T, Machado LN, Magaletti L, Mahn K, Malek M, Manly S, Maret L, Marino AD, Marti-Magro L, Maruyama T, Matsubara T, Matsushita K, Mauger C, Maurel A, Mavrokoridis K, Mazzucato E, McCauley N, McElwee J, McFarland KS, McGrew C, Mefodiev A, Megias GD, Mellet L, Mezzetto M, Minamino A, Mineev O, Mine S, Miura M, Molina Bueno L, Moriyama S, Mueller TA, Munford D, Munteanu L, Nagai Y, Nakadet al., 2021, First T2K measurement of transverse kinematic imbalance in the muon-neutrino charged-current single-π+ production channel containing at least one proton, Physical Review D, Vol: 103, Pages: 1-27, ISSN: 2470-0010

This paper reports the first T2K measurement of the transverse kinematic imbalance in the single-π+ production channel of neutrino interactions. We measure the differential cross sections in the muon-neutrino charged-current interaction on hydrocarbon with a single π+ and at least one proton in the final state, at the ND280 off axis near detector of the T2K experiment. The extracted cross sections are compared to the predictions from different neutrino-nucleus interaction event generators. Overall, the results show a preference for models that have a more realistic treatment of nuclear medium effects including the initial nuclear state and final-state interactions.

• Abstract
• Publisher Web Link
• Open Access Link
• Cite

Abe K, Akhlaq N, Akutsu R, Ali A, Alt C, Andreopoulos C, Antonova M, Aoki S, Arihara T, Asada Y, Ashida Y, Atkin ET, Awataguchi Y, Barker GJ, Barr G, Barrow D, Batkiewicz-Kwasniak M, Beloshapkin A, Bench F, Berardi V, Berns L, Bhadra S, Blanchet A, Blondel A, Bolognesi S, Bonus T, Bourguille B, Boyd SB, Bravar A, Bravo Berguño D, Bronner C, Bron S, Bubak A, Buizza Avanzini M, Cao S, Cartwright SL, Catanesi MG, Cervera A, Chakrani J, Cherdack D, Christodoulou G, Cicerchia M, Coleman J, Collazuol G, Cook L, Coplowe D, Cudd A, De Rosa G, Dealtry T, Delogu CC, Dennis SR, Densham C, Dergacheva A, Di Lodovico F, Dolan S, Douqa D, Doyle TA, Dumarchez J, Dunne P, Eguchi A, Eklund L, Emery-Schrenk S, Ereditato A, Finch AJ, Fiorillo G, Francois C, Friend M, Fujii Y, Fukuda R, Fukuda Y, Fusshoeller K, Giganti C, Gonin M, Goodman EAG, Gorin A, Grassi M, Guigue M, Hadley DR, Hamacher-Baumann P, Harris DA, Hartz M, Hasegawa T, Hassani S, Hastings NC, Hayato Y, Hiramoto A, Hogan M, Holeczek J, Hong Van NT, Honjo T, Iacob F, Ichikawa AK, Ikeda M, Ishida T, Ishitsuka M, Iwamoto K, Izmaylov A, Izumi N, Jakkapu M, Jamieson B, Jenkins SJ, Jesús-Valls C, Jiang JJ, Jonsson P, Jung CK, Jurj PB, Kabirnezhad M, Kakuno H, Kameda J, Kasetti SP, Kataoka Y, Katayama Y, Katori T, Kearns E, Khabibullin M, Khotjantsev A, Kikawa T, Kikutani H, King S, Kisiel J, Kobata T, Kobayashi T, Koch L, Konaka A, Kormos LL, Koshio Y, Kostin A, Kowalik K, Kudenko Y, Kuribayashi S, Kurjata R, Kutter T, Kuze M, Labarga L, Lagoda J, Lamoureux M, Last D, Laveder M, Lawe M, Lin S-K, Litchfield RP, Liu SL, Longhin A, Ludovici L, Lu X, Lux T, Machado LN, Magaletti L, Mahn K, Malek M, Manly S, Maret L, Marino AD, Marti-Magro L, Maruyama T, Matsubara T, Matsushita K, Mauger C, Maurel A, Mavrokoridis K, Mazzucato E, McCauley N, McElwee J, McFarland KS, McGrew C, Mefodiev A, Megias GD, Mellet L, Mezzetto M, Minamino A, Mineev O, Mine S, Miura M, Molina Bueno L, Moriyama S, Mueller TA, Munford D, Munteanu L, Nagai Y, Nakadet al., 2021, Improved constraints on neutrino mixing from the T2K experiment with 3.13×1021 protons on target, Physical Review D, Vol: 103, Pages: 1-59, ISSN: 2470-0010

The T2K experiment reports updated measurements of neutrino and antineutrino oscillations using both appearance and disappearance channels. This result comes from an exposure of 14.9(16.4)×1020 protons on target in neutrino (antineutrino) mode. Significant improvements have been made to the neutrino interaction model and far detector reconstruction. An extensive set of simulated data studies have also been performed to quantify the effect interaction model uncertainties have on the T2K oscillation parameter sensitivity. T2K performs multiple oscillation analyses that present both frequentist and Bayesian intervals for the Pontecorvo-Maki-Nakagawa-Sakata parameters. For fits including a constraint on sin2θ13 from reactor data and assuming normal mass ordering T2K measures sin2θ23=0.53+0.03−0.04 and Δm232=(2.45±0.07)×10−3  eV2 c−4. The Bayesian analyses show a weak preference for normal mass ordering (89% posterior probability) and the upper sin2θ23 octant (80% posterior probability), with a uniform prior probability assumed in both cases. The T2K data exclude CP conservation in neutrino oscillations at the 2σ level.

• Abstract
• Publisher Web Link
• Open Access Link
• Cite

Abe K, Akhlaq N, Akutsu R, Ali A, Alt C, Andreopoulos C, Anthony L, Antonova M, Aoki S, Ariga A, Arihara T, Asada Y, Ashida Y, Atkin ET, Awataguchi Y, Ban S, Barbi M, Barker GJ, Barr G, Barrow D, Barry C, Batkiewicz-Kwasniak M, Beloshapkin A, Bench F, Berardi V, Berkman S, Berns L, Bhadra S, Bienstock S, Blanchet A, Blondel A, Bolognesi S, Bonus T, Bourguille B, Boyd SB, Brailsford D, Bravar A, Berguno DB, Bronner C, Bron S, Bubak A, Avanzini MB, Calcutt J, Campbell T, Cao S, Cartwright SL, Catanesi MG, Cervera A, Chappell A, Checchia C, Cherdack D, Chikuma N, Christodoulou G, Cicerchia M, Coleman J, Collazuol G, Cook L, Coplowe D, Cudd A, Dabrowska A, De Rosa G, Dealtry T, Denner PF, Dennis SR, Densham C, Dergacheva A, Di Lodovico F, Dokania N, Dolan S, Doyle TA, Drapier O, Dumarchez J, Dunne P, Eguchi A, Eklund L, Emery-Schrenk S, Ereditato A, Fernandez P, Feusels T, Finch AJ, Fiorentini GA, Fiorillo G, Francois C, Friend M, Fujii Y, Fujita R, Fukuda D, Fukuda R, Fukuda Y, Fusshoeller K, Gameil K, Giganti C, Golan T, Gonin M, Gorin A, Guigue M, Hadley DR, Haigh JT, Hamacher-Baumann P, Harris DA, Hartz M, Hasegawa T, Hassani S, Hastings NC, Hayashino T, Hayato Y, Hiramoto A, Hogan M, Holeczek J, Van NTH, Honjo T, Iacob F, Ichikawa AK, Ikeda M, Ishida T, Ishii T, Ishitsuka M, Iwamoto K, Izmaylov A, Izumi N, Jakkapu M, Jamieson B, Jenkins SJ, Jesus-Valls C, Jiang M, Johnson S, Jonsson P, Jung CK, Jurj PB, Kabirnezhad M, Kaboth AC, Kajita T, Kakuno H, Kameda J, Karlen D, Kasetti SP, Kataoka Y, Katayama Y, Katori T, Kato Y, Kearns E, Khabibullin M, Khotjantsev A, Kikawa T, Kikutani H, Kim H, Kim J, King S, Kisiel J, Knight A, Knox A, Kobata T, Kobayashi T, Koch L, Koga T, Konaka A, Kormos LL, Koshio Y, Kostin A, Kowalik K, Kubo H, Kudenko Y, Kukita N, Kuribayashi S, Kurjata R, Kutter T, Kuze M, Labarga L, Lagoda J, Lamoureux M, Last D, Laveder M, Lawe M, Licciardi M, Lindner T, Litchfield RP, Liu SL, Li X, Longhin A, Ludovici L, Lu X, Lux T, Machado LN, Magaletti L, Maet al., 2021, Measurements of (nu)over-bar(mu) and (nu)over-bar(mu) + nu(mu) charged-current cross-sections without detected pions or protons on water and hydrocarbon at a mean anti-neutrino energy of 0.86 GeV, Progress of Theoretical and Experimental Physics, Vol: 2021, ISSN: 0033-068X

We report measurements of the flux-integrated ν̅μ and ν̅μ + νμ charged-current cross-sections on water and hydrocarbon targets using the T2K anti-neutrino beam with a mean beam energy of 0.86 GeV. The signal is defined as the (anti-)neutrino charged-current interaction with one induced μ± and no detected charged pion or proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton Module. The phase space of muons is restricted to the high-detection efficiency region, pμ>400 MeV/c and θμ<30∘⁠, in the laboratory frame. An absence of pions and protons in the detectable phase spaces of pπ>200 MeV/c⁠, θπ<70∘ and pp>600 MeV/c⁠, θp<70∘ is required. In this paper, both the ν¯¯¯μ cross-sections and ν¯¯¯μ+νμ cross-sections on water and hydrocarbon targets and their ratios are provided by using the D’Agostini unfolding method. The results of the integrated ν¯¯¯μ cross-section measurements over this phase space are σH2O=(1.082±0.068(stat.)+0.145−0.128(syst.))×10−39cm2/nucleon⁠, σCH=(1.096±0.054(stat.)+0.132−0.117(syst.))×10−39cm2/nucleon⁠, and σH2O/σCH=0.987±0.078(stat.)+0.093−0.090(syst.)⁠. The ν¯¯¯μ+νμ cross-section is σH2O=(1.155±0.064(stat.)+0.148−0.129(syst.))×10−39cm2/nucleon⁠, σCH=(1.159±0.049(stat.)+0.129−0.115(syst.))×10−39cm2/nucleon⁠, and σH2O/σCH=0.996±0.069(stat.)+0.083−0.078(syst.)⁠.

• Abstract
• Publisher Web Link
• Author Web Link
• Open Access Link
• Cite

Abe K, Akhlaq N, Akutsu R, Ali A, Alt C, Andreopoulos C, Antonova M, Aoki S, Arihara T, Asada Y, Ashida Y, Atkin ET, Awataguchi Y, Barker GJ, Barr G, Barrow D, Batkiewicz-Kwasniak M, Beloshapkin A, Bench F, Berardi V, Berns L, Bhadra S, Blondel A, Bolognesi S, Bonus T, Bourguille B, Boyd SB, Bravar A, Berguno DB, Bronner C, Bron S, Bubak A, Avanzini MB, Cao S, Cartwright SL, Catanesi MG, Cervera A, Cherdack D, Christodoulou G, Cicerchia M, Coleman J, Collazuol G, Cook L, Coplowe D, Cudd A, De Rosa G, Dealtry T, Delogu CC, Dennis SR, Densham C, Dergacheva A, Di Lodovico F, Dolan S, Doyle TA, Dumarchez J, Dunne P, Eguchi A, Eklund L, Emery-Schrenk S, Ereditato A, Finch AJ, Fiorentini GA, Francois C, Friend M, Fujii Y, Fukuda R, Fukuda Y, Fusshoeller K, Giganti C, Gonin M, Gorin A, Guigue M, Hadley DR, Hamacher-Baumann P, Hartz M, Hasegawa T, Hassani S, Hastings NC, Hayato Y, Hiramoto A, Hogan M, Holeczek J, Van NTH, Honjo T, Iacob F, Ichikawa AK, Ikeda M, Ishida T, Ishitsuka M, Iwamoto K, Izmaylov A, Izumi N, Jakkapu M, Jamieson B, Jenkins SJ, Jesus-Valls C, Jonsson P, Jung CK, Jurj PB, Kabirnezhad M, Kakuno H, Kameda J, Kasetti SP, Kataoka Y, Katayama Y, Katori T, Kearns E, Khabibullin M, Khotjantsev A, Kikawa T, Kikutani H, King S, Kisiel J, Kobata T, Kobayashi T, Koch L, Konaka A, Kormos LL, Koshio Y, Kostin A, Kowalik K, Kudenko Y, Kuribayashi S, Kurjata R, Kutter T, Kuze M, Labarga L, Lagoda J, Lamoureux M, Last D, Laveder M, Lawe M, Litchfield RP, Liu SL, Longhin A, Ludovici L, Lu X, Lux T, Machado LN, Magaletti L, Mahn K, Malek M, Manly S, Maret L, Marino AD, Marti-Magro L, Maruyama T, Matsubara T, Matsushita K, Mauger C, Mavrokoridis K, Mazzucato E, McCauley N, McElwee J, McFarland KS, McGrew C, Mefodiev A, Mezzetto M, Minamino A, Mineev O, Mine S, Miura M, Bueno LM, Moriyama S, Mueller TA, Munteanu L, Nagai Y, Nakadaira T, Nakahata M, Nakajima Y, Nakamura A, Nakamura K, Nakano Y, Nakayama S, Nakaya T, Nakayoshi K, Naseby CER, Ngoc T, Nguyen VQ, Niewczas K, Niet al., 2021, T2K measurements of muon neutrino and antineutrino disappearance using 3.13 x 10(21) protons on target, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 103, Pages: 1-9, ISSN: 1550-2368

We report measurements by the T2K experiment of the parameters θ23 and Δm232, which govern the disappearance of muon neutrinos and antineutrinos in the three-flavor PMNS neutrino oscillation model at T2K’s neutrino energy and propagation distance. Utilizing the ability of the experiment to run with either a mainly neutrino or a mainly antineutrino beam, muon-like events from each beam mode are used to measure these parameters separately for neutrino and antineutrino oscillations. Data taken from 1.49×1021 protons on target (POT) in neutrino mode and 1.64×1021 POT in antineutrino mode are used. The best-fit values obtained by T2K were sin2(θ23)=0.51+0.06−0.07(0.43+0.21−0.05) and Δm232=2.47+0.08−0.09(2.50+0.18−0.13)×10−3  eV2/c4 for neutrinos (antineutrinos). No significant differences between the values of the parameters describing the disappearance of muon neutrinos and antineutrinos were observed. An analysis using an effective two-flavor neutrino oscillation model where the sine of the mixing angle is allowed to take nonphysical values larger than 1 is also performed to check the consistency of our data with the three-flavor model. Our data were found to be consistent with a physical value for the mixing angle.

• Abstract
• Publisher Web Link
• Author Web Link
• Open Access Link
• Cite

Abe K, Bronner C, Hayato Y, Ikeda M, Imaizumi S, Ito H, Kameda J, Kataoka Y, Miura M, Moriyama S, Nagao Y, Nakahata M, Nakajima Y, Nakayama S, Okada T, Okamoto K, Orii A, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Takenaka A, Tanaka H, Yano T, Akutsu R, Han S, Kajita T, Okumura K, Tashiro T, Wang R, Xia J, Bravo-Berguno D, Labarga L, Marti LL, Zaldivar B, Blaszczyk FDM, Kearns E, Gustafson JD, Raaf JL, Stone JL, Wan L, Wester T, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Weatherly P, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Anthony LH, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Ospina N, Ludovici L, Nishimura Y, Cao S, Friend M, Hasegawa T, Ishida T, Kobayashi T, Matsubara T, Nakadaira T, Jakkapu M, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Nakano Y, Shiozawa T, Suzuki AT, Takeuchi Y, Yamamoto S, Ali A, Ashida Y, Feng J, Hirota S, Ichikawa AK, Kikawa T, Mori M, Nakaya T, Wendell RA, Yasutome K, Fernandez P, McCauley N, Mehta P, Pritchard A, Tsui KM, Fukuda Y, Itow Y, Menjo H, Niwa T, Sato K, Tsukada M, Mijakowski P, Posiadala-Zezula M, Jung CK, Vilela C, Wilking MJ, Yanagisawa C, Harada M, Hagiwara K, Horai T, Ishino H, Ito S, Koshio Y, Ma W, Piplani N, Sakai S, Kuno Y, Barr G, Barrow D, Cook L, Goldsack A, Samani S, Simpson C, Wark D, Nova F, Boschi T, Di Lodovico F, Sedgwick SM, Taani M, Zsoldos S, Yang JY, Jenkins SJ, McElwee JM, Thiesse MD, Thompson LF, Malek M, Stone O, Okazawa H, Kim SB, Yu I, Nishijima K, Koshiba M, Ogawa N, Iwamoto K, Yokoyama M, Martens K, Vagins MR, Kuze M, Izumiyama S, Tanaka M, Yoshida T, Inomoto M, Ishitsuka M, Matsumoto R, Ohta K, Shinoki M, Martin JF, Tanaka HA, Towstego T, Hartz M, Konaka A, de Perio P, Pret al., 2021, Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande, PHYSICAL REVIEW D, Vol: 103, ISSN: 2470-0010

• Author Web Link
• Cite
• Citations: 13

Takenaka A, Abe K, Bronner C, Hayato Y, Ikeda M, Imaizumi S, Ito H, Kameda J, Kataoka Y, Kato Y, Kishimoto Y, Marti L, Miura M, Moriyama S, Mochizuki T, Nagao Y, Nakahata M, Nakajima Y, Nakayama S, Okada T, Okamoto K, Orii A, Pronost G, Sekiya H, Shiozawa M, Sonoda Y, Suzuki Y, Takeda A, Takemoto Y, Tanaka H, Yano T, Akutsu R, Han S, Kajita T, Okumura K, Tashiro T, Wang R, Xia J, Bravo-Berguno D, Labarga L, Fernandez P, Zaldivar B, Blaszczyk FDM, Kearns E, Raaf JL, Stone JL, Wan L, Wester T, Pointon BW, Bian J, Griskevich NJ, Kropp WR, Locke S, Mine S, Smy MB, Sobel HW, Takhistov V, Weatherly P, Ganezer KS, Hill J, Kim JY, Lim IT, Park RG, Bodur B, Scholberg K, Walter CW, Coffani A, Drapier O, El Hedri S, Giampaolo A, Gonin M, Mueller TA, Paganini P, Quilain B, Ishizuka T, Nakamura T, Jang JS, Learned JG, Matsuno S, Anthony LH, Litchfield RP, Sztuc AA, Uchida Y, Berardi V, Catanesi MG, Radicioni E, Calabria NF, Machado LN, De Rosa G, Collazuol G, Iacob F, Lamoureux M, Ospina N, Ludovici L, Nishimura Y, Cao S, Friend M, Hasegawa T, Ishida T, Jakkapu M, Kobayashi T, Matsubara T, Nakadaira T, Nakamura K, Oyama Y, Sakashita K, Sekiguchi T, Tsukamoto T, Hasegawa M, Isobe Y, Miyabe H, Nakano Y, Shiozawa T, Sugimoto T, Suzuki AT, Takeuchi Y, Yamamoto S, Ali A, Ashida Y, Feng J, Hirota S, Ichikawa AK, Jiang M, Kikawa T, Mori M, Nakamura KE, Nakaya T, Wendell RA, Yasutome K, McCauley N, Mehta P, Pritchard A, Tsui KM, Fukuda Y, Itow Y, Menjo H, Niwa T, Sato K, Taani M, Tsukada M, Mijakowski P, Frankiewicz K, Jung CK, Santucci G, Vilela C, Wilking MJ, Yanagisawa C, Fukuda D, Harada M, Hagiwara K, Horai T, Ishino H, Ito S, Koshio Y, Ma K, Piplani N, Sakai S, Sakuda M, Takahira Y, Xu C, Kuno Y, Barr G, Barrow D, Cook L, Simpson C, Wark D, Nova F, Boschi T, Di Lodovico F, Segwick SM, Zsoldos S, Yang JY, Jenkins SJ, McElwee JM, Thiesse MD, Thompson LF, Okazawa H, Choi Y, Kim SB, Yu I, Nishijima K, Koshiba M, Iwamoto K, Ogawa N, Yokoyama M, Goldsack A, Martens K, Vagins MR, Kuze Met al., 2020, Search for proton decay via <i>p</i> → <i>e</i><SUP>+</SUP>π<SUP>0</SUP> and <i>p</i> → μ<SUP>+</SUP>π<SUP>0</SUP> with an enlarged fiducial volume in Super-Kamiokande I-IV, PHYSICAL REVIEW D, Vol: 102, ISSN: 2470-0010

• Author Web Link
• Cite
• Citations: 34