Publications
478 results found
Arnold R, Augier C, Barabash AS, et al., 2021, Measurement of the distribution of 207Bi depositions on calibration sources for SuperNEMO, Publisher: arXiv
The SuperNEMO experiment will search for neutrinoless double-beta decay($0\nu\beta\beta$), and study the Standard-Model double-beta decay process($2\nu\beta\beta$). The SuperNEMO technology can measure the energy of each ofthe electrons produced in a double-beta ($\beta\beta$) decay, and canreconstruct the topology of their individual tracks. The study of thedouble-beta decay spectrum requires very accurate energy calibration to becarried out periodically. The SuperNEMO Demonstrator Module will be calibratedusing 42 calibration sources, each consisting of a droplet of $^{207}$Bi withina frame assembly. The quality of these sources, which depends upon the entire $^{207}$Bidroplet being contained within the frame, is key for correctly calibratingSuperNEMO's energy response. In this paper, we present a novel method forprecisely measuring the exact geometry of the deposition of $^{207}$Bi dropletswithin the frames, using Timepix pixel detectors. We studied 49 differentsources and selected 42 high-quality sources with the most central sourcepositioning.
Collaboration N, Arnold R, Augier C, et al., 2020, Search for periodic modulations of the rate of double-beta decay of 100Mo in the NEMO-3 detector, Publisher: arXiv
Double-beta decays of $^{100}$Mo from the 6.0195-year exposure of a 6.914 kghigh-purity sample were recorded by the NEMO-3 experiment that searched forneutrinoless double-beta decays. These ultra-rare transitions to $^{100}$Ruhave a half-life of approximately $7\times10^{18}$ years, and have been used toconduct the first ever search for periodic variations of this decay mode. TheLomb-Scargle periodogram technique, and its error-weighted extension, wereemployed to look for periodic modulations of the half-life. Monte Carlomodeling was used to study the modulation sensitivity of the data over a broadrange of amplitudes and frequencies. Data show no evidence of modulations withamplitude greater than 2.5% in the frequency range of $0.33225\,{\rm y^{-1}}$to $365.25\,{\rm y^{-1}}$.
Arnold R, Augier C, Barabash AS, et al., 2020, Search for the double-beta decay of 82Se to the excited states of 82Kr with NEMO-3, Nuclear Physics A, Vol: 996, Pages: 1-21, ISSN: 0375-9474
Rakhimov A, Barabash AS, Basharina-Freshville A, et al., 2020, Development of methods for the preparation of radiopure 82Se sources for the SuperNEMO neutrinoless double-beta decay experiment, Radiochimica Acta, Vol: 108, ISSN: 0033-8230
A radiochemical method for producing 82Se sources with an ultra-low level of contamination of natural radionuclides (40K, decay products of 232Th and 238U) has been developed based on cation-exchange chromatographic purification with reverse removal of impurities. It includes chromatographic separation (purification), reduction, conditioning (which includes decantation, centrifugation, washing, grinding, and drying), and 82Se foil production. The conditioning stage, during which highly dispersed elemental selenium is obtained by the reduction of purified selenious acid (H2SeO3) with sulfur dioxide (SO2) represents the crucial step in the preparation of radiopure 82Se samples. The natural selenium (600 g) was first produced in this procedure in order to refine the method. The technique developed was then used to produce 2.5 kg of radiopure enriched selenium (82Se). The produced 82Se samples were wrapped in polyethylene (12 μm thick) and radionuclides present in the sample were analyzed with the BiPo-3 detector. The radiopurity of the plastic materials (chromatographic column material and polypropylene chemical vessels), which were used at all stages, was determined by instrumental neutron activation analysis. The radiopurity of the 82Se foils was checked by measurements with the BiPo-3 spectrometer, which confirmed the high purity of the final product. The measured contamination level for 208Tl was 8–54 μBq/kg, and for 214Bi the detection limit of 600 μBq/kg has been reached.
Arnold R, Augier C, Barabash AS, et al., 2019, Detailed studies of 100< Mo two-neutrino double beta decay in NEMO-3, European Physical Journal C: Particles and Fields, Vol: 79, Pages: 1-11, ISSN: 1124-1861
The full data set of the NEMO-3 experiment has been used to measure the half-life of the two-neutrino double beta decay of 100 Mo to the ground state of 100 Ru, 𝑇1/2=[6.81±0.01( stat )+0.38−0.40( syst )]×1018 year. The two-electron energy sum, single electron energy spectra and distribution of the angle between the electrons are presented with an unprecedented statistics of 5×105 events and a signal-to-background ratio of ∼ 80. Clear evidence for the Single State Dominance model is found for this nuclear transition. Limits on Majoron emitting neutrinoless double beta decay modes with spectral indices of n=2,3,7 , as well as constraints on Lorentz invariance violation and on the bosonic neutrino contribution to the two-neutrino double beta decay mode are obtained.
Barabash AS, Basharina-Freshville A, Blot S, et al., 2017, Calorimeter development for the SuperNEMO double beta decay experiment, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol: 868, Pages: 98-108, ISSN: 0168-9002
SuperNEMO is a double-β decay experiment, which will employ the successful tracker–calorimeter technique used in the recently completed NEMO-3 experiment. SuperNEMO will implement 100 kg of double-β decay isotope, reaching a sensitivity to the neutrinoless double-β decay (0νββ) half-life of the order of 1026 yr, corresponding to a Majorana neutrino mass of 50–100 meV. One of the main goals and challenges of the SuperNEMO detector development programme has been to reach a calorimeter energy resolution, ΔE∕E, around 3%∕E(MeV) σ, or 7%∕E(MeV) FWHM (full width at half maximum), using a calorimeter composed of large volume plastic scintillator blocks coupled to photomultiplier tubes. We describe the R&D programme and the final design of the SuperNEMO calorimeter that has met this challenging goal.
Adey D, Agarwalla SK, Ankenbrandt CM, et al., 2014, Light sterile neutrino sensitivity at the nuSTORM facility, Physical Review D: Particles, Fields, Gravitation and Cosmology, Vol: 89, ISSN: 1550-7998
A facility that can deliver beams of electron and muon neutrinos from the decay of a stored muon beam has the potential to unambiguously resolve the issue of the evidence for light sterile neutrinos that arises in short-baseline neutrino oscillation experiments and from estimates of the effective number of neutrino flavors from fits to cosmological data. In this paper, we show that the nuSTORM facility, with stored muons of 3.8 GeV/c ± 10%, will be able to carry out a conclusive muon neutrino appearance search for sterile neutrinos and test the LSND and MiniBooNE experimental signals with 10σ sensitivity, even assuming conservative estimates for the systematic uncertainties. This experiment would add greatly to our knowledge of the contribution of light sterile neutrinos to the number of effective neutrino flavors from the abundance of primordial helium production and from constraints on neutrino energy density from the cosmic microwave background. The appearance search is complemented by a simultaneous muon neutrino disappearance analysis that will facilitate tests of various sterile neutrino models.
Derrick M, Krakauer D, Magill S, et al., 2014, Search for lepton flavor violation in ep collisions at 300 GeV center of mass energy, ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, Vol: 73, Pages: 613-628, ISSN: 0170-9739
Using the ZEUS detector at the HERA electronproton collider, we have searched for lepton flavor violation in ep collisions at a center—of—mass energy ($sqrt S$) of 300 GeV. Events of the type e + p → ℓ + X with a final—state lepton of high transverse momentum, ℓ = μ or τ, were sought. No evidence was found for lepton flavor violation in the combined 1993 and 1994 data samples, for which the integrated luminosities were 0.84 pb{−1}for e{∼p collisions and 2.94 pb{−1} for e+p collisions. Limits on coupling vs. mass are provided for leptoquarks and R—parity violating squarks. For flavor violating couplings of electromagnetic strength, we set 95% confidence level lower limits on leptoquark masses between 207 GeV and 272 GeV, depending on the leptoquark species and final—state lepton. For leptoquark masses larger than 300 GeV, limits on flavor—changing couplings are determined, many of which supersede prior limits from rare decay processes.
Schael S, Barate R, Bruneliere R, et al., 2013, Electroweak measurements in electron positron collisions at W-boson-pair energies at LEP, PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, Vol: 532, Pages: 119-244, ISSN: 0370-1573
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- Citations: 352
Adey D, Agarwalla SK, Ankenbrandt CM, et al., 2013, nuSTORM - Neutrinos from STORed Muons: Proposal to the Fermilab PAC
The nuSTORM facility has been designed to deliver beams of electron neutrinosand muon neutrinos (and their anti-particles) from the decay of a stored muonbeam with a central momentum of 3.8 GeV/c and a momentum acceptance of 10%. Thefacility is unique in that it will: 1. Allow searches for sterile neutrinos ofexquisite sensitivity to be carried out; 2. Serve future long- andshort-baseline neutrino-oscillation programs by providing definitivemeasurements of electron neutrino and muon neutrino scattering cross sectionsoff nuclei with percent-level precision; and 3. Constitutes the crucial firststep in the development of muon accelerators as a powerful new technique forparticle physics. The document describes the facility in detail anddemonstrates its physics capabilities. This document was submitted to theFermilab Physics Advisory Committee in consideration for Stage I approval.
Arnold R, Augier C, Baker J, et al., 2010, Probing new physics models of neutrinoless double beta decay with SuperNEMO, EUROPEAN PHYSICAL JOURNAL C, Vol: 70, Pages: 927-943, ISSN: 1434-6044
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- Citations: 153
Argyriades J, Arnold R, Augier C, et al., 2010, Spectral modeling of scintillator for the NEMO-3 and SuperNEMO detectors, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol: 625, Pages: 20-28, ISSN: 0168-9002
We have constructed a GEANT4-based detailed software model of photon transport in plastic scintillator blocks and have used it to study the NEMO-3 and SuperNEMO calorimeters employed in experiments designed to search for neutrinoless double beta decay. We compare our simulations to measurements using conversion electrons from a calibration source of 207Bi and show that the agreement is improved if wavelength-dependent properties of the calorimeter are taken into account. In this article, we briefly describe our modeling approach and results of our studies.
Argyriades J, Arnold R, Augier C, et al., 2010, Results of the BiPo-1 prototype for radiopurity measurements for the SuperNEMO double beta decay source foils, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Vol: 622, Pages: 120-128, ISSN: 0168-9002
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- Citations: 23
Schael S, Barate R, Bruneliere R, et al., 2010, Search for neutral Higgs bosons decaying into four taus at LEP2, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 52
Schael S, Barate R, Bruneliere R, et al., 2009, Measurement of Z-pair production in e(+)e(-) collisions and constraints on anomalous neutral gauge couplings, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 5
Schael S, Barate R, Bruneliere R, et al., 2007, Measurement of the cross section for open b-quark production in two-photon interactions at LEP, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 4
Schael S, Barate R, Bruneliere R, et al., 2007, Fermion pair production in e(+)e(-) collisions at 189-209 GeV and constraints on physics beyond the standard model, EUROPEAN PHYSICAL JOURNAL C, Vol: 49, Pages: 411-437, ISSN: 1434-6044
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- Citations: 55
Schael S, Barate R, Bruneliere R, et al., 2007, Search for Higgs bosons decaying to WW in e(+)e(-) stope collisions at LEP, EUROPEAN PHYSICAL JOURNAL C, Vol: 49, Pages: 439-455, ISSN: 1434-6044
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- Citations: 6
Schael S, Barate R, Bruneliere R, et al., 2006, Test of colour reconnection models using three-jet events in hadronic Z decays, EUROPEAN PHYSICAL JOURNAL C, Vol: 48, Pages: 685-698, ISSN: 1434-6044
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- Citations: 9
Schael S, Barate R, Bruneliere R, et al., 2006, Search for neutral MSSM Higgs bosons at LEP, EUROPEAN PHYSICAL JOURNAL C, Vol: 47, Pages: 547-587, ISSN: 1434-6044
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- Citations: 601
Schael S, Barate R, Bruneliere R, et al., 2006, Deuteron and anti-deuteron production in e(+)e(-) collisions at the Z resonance, PHYSICS LETTERS B, Vol: 639, Pages: 192-201, ISSN: 0370-2693
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- Citations: 44
Schael S, Barate R, Bruneliere R, et al., 2006, Measurement of the W boson mass and width in e(+)e(-) collisions at LEP, EUROPEAN PHYSICAL JOURNAL C, Vol: 47, Pages: 309-335, ISSN: 1434-6044
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- Citations: 36
Schael S, Barate R, Bruneliere R, et al., 2006, Precision electroweak measurements on the Z resonance, PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, Vol: 427, Pages: 257-454, ISSN: 0370-1573
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- Citations: 1329
Schael S, Barate R, Bruneliere R, et al., 2005, Branching ratios and spectral functions of tau decays: Final ALEPH measurements and physics implications, PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, Vol: 421, Pages: 191-284, ISSN: 0370-1573
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- Citations: 308
Schael S, Barate R, Bruneliere R, et al., 2005, Improved measurement of the triple gauge-boson couplings gamma WW and ZWW in e(+)e(-) collisions, PHYSICS LETTERS B, Vol: 614, Pages: 7-26, ISSN: 0370-2693
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- Citations: 56
Schael S, Barate R, Bruneliere R, et al., 2005, Two-particle correlations in pp, (p)over-bar(p)over-bar and (KSKS0)-K-0 pairs from hadronic Z decays, PHYSICS LETTERS B, Vol: 611, Pages: 66-80, ISSN: 0370-2693
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- Citations: 14
Schael S, Barate R, Bruneliere R, et al., 2005, Bose-Einstein correlations in W-pair decays with an event-mixing technique, PHYSICS LETTERS B, Vol: 606, Pages: 265-275, ISSN: 0370-2693
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- Citations: 30
Schael S, Barate R, Bruneliere R, et al., 2005, Single vector boson production in e(+)e(-) collisions at centre-of-mass energies from 183 to 209 GeV, PHYSICS LETTERS B, Vol: 605, Pages: 49-62, ISSN: 0370-2693
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- Citations: 5
Schael S, Barate R, Bruneliere R, et al., 2004, Measurement of W-pair production in e(+)e(-) collisions at centre-of-mass energies from 183 to 209 GeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 38, Pages: 147-160, ISSN: 1434-6044
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- Citations: 7
Heister A, Schael S, Barate R, et al., 2004, Constraints on anomalous QGCs in e(+)e(-) interactions from 183 to 209 GeV, PHYSICS LETTERS B, Vol: 602, Pages: 31-40, ISSN: 0370-2693
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- Citations: 11
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