444 results found
Hammond GD, Paton AP, Speake CC, et al., 2008, New spin source to search for scalar-pseudoscalar couplings at short range, PHYSICAL REVIEW D, Vol: 77, ISSN: 1550-7998
Sumner TJ, 2008, Fundamental physics experiments in space (within ESA), Pages: 36-42
As a discipline Fundamental Physics is a relatively new domain within the European Space Agency for carrying out dedicated space experiments. However the availability of new technologies making a very quiet environment in space accessible, together with a powerful scientific motivation have created a community of scientists who are promoting a number of experiments. The motivations, technologies and some specific mission concepts will be reviewed.
IceCube is a new high-energy neutrino telescope which will be coming online in the near future. IceCube will be capable of measuring fluxes of all three flavors of neutrino, and its peak neutrino energy sensitivity will be in the TeV-PeV range. Here, after a brief description of the detector, we describe its anticipated performance with a selection of physics topics: supernovae, extraterrestrial diffuse and point sources of neutrinos, gamma-ray bursts, neutrinos from WIMP annihilation, and cosmic ray composition. © 2008 The Physical Society of Japan.
Burgos S, Forbes J, Ghag C, et al., 2008, Track reconstruction and performance of DRIFT directional dark matter detectors using alpha particles, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol: 584, Pages: 114-128, ISSN: 0168-9002
First results are presented from an analysis of data from the DRIFT-IIa and DRIFT-IIb directional dark matter detectors at Boulby Mine in which alpha particle tracks were reconstructed and used to characterise detector performance—an important step towardsoptimising directional technology. The drift velocity in DRIFT-IIa was 59:3 0:2 (stat) 7:5 (sys) ms 1based on an analysis ofnaturally occurring alpha-emitting background. The drift velocity in DRIFT-IIb was 57 1 (stat) 3 (sys) ms 1determined by theanalysis of alpha particle tracks from a210Po source. Three-dimensional range reconstruction and range spectra were used to identifyalpha particles from the decay of222Rn,218Po,220Rn and216Po. This study found thatð22 2Þ%of218Po progeny (from222Rn decay)did not plate out and remained suspended in the 40 Torr CS2gas fill until they decayed. A likely explanation for this is that some of thepolonium progeny are produced in an uncharged state. For216Po progeny (from220Rn decay) the undeposited fraction was apparentlymuch higher atð100þ0 35Þ% most likely due to a shorter lifetime, causing a larger fraction of the progeny to decay whilst drifting to the cathode plane. This explanation implies a much slower drift time for positively charged polonium progeny compared to CS2 ions.
Achterberg A, Ackermann M, Adams J, et al., 2008, IceCube contributions to the XIV International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2006) Weihai, China - August 15-22, 14th International Symposium on Very High Energy Cosmic Ray Interactions, Publisher: ELSEVIER SCIENCE BV, Pages: 407-408, ISSN: 0920-5632
Burgos S, Forbes J, Ghag C, et al., 2007, Studies of neutron detection and backgrounds with the DRIFT-IIa dark matter detector, ASTROPARTICLE PHYSICS, Vol: 28, Pages: 409-421, ISSN: 0927-6505
Sumner TJ, Akimov DY, Alner GJ, et al., 2007, The ZEPLIN III detector; Results from surface calibrations, 7th UCLA Symposium on Sources and Detection of Dark Matter and Dark Energy in the Universe, Publisher: ELSEVIER, Pages: 108-112, ISSN: 0920-5632
Alner GJ, Araujo HM, Bewick A, et al., 2007, Limits on spin-dependent WIMP-nucleon cross-sections from the first ZEPLIN-II data, PHYSICS LETTERS B, Vol: 653, Pages: 161-166, ISSN: 0370-2693
Achterberg A, Ackermann M, Adams J, et al., 2007, Multiyear search for a diffuse flux of muon neutrinos with AMANDA-II, PHYSICAL REVIEW D, Vol: 76, ISSN: 1550-7998
Achterberg A, Ackermann M, Adams J, et al., 2007, Search for neutrino-induced cascades from gamma-ray bursts with Amanda, ASTROPHYSICAL JOURNAL, Vol: 664, Pages: 397-410, ISSN: 0004-637X
Achterberg A, Ackermann M, Adams J, et al., 2007, Detection of atmospheric muon neutrinos with the IceCube 9-string detector, PHYSICAL REVIEW D, Vol: 76, ISSN: 1550-7998
Alner GJ, Araujo HM, Bewick A, et al., 2007, First limits on WIMP nuclear recoil signals in ZEPLIN-II: A two-phase xenon detector for dark matter detection, Astroparticle Physics, Vol: 28, Pages: 287-302, ISSN: 1873-2852
Results are presented from the first underground data run of ZEPLIN-II, a 31 kg two-phase xenon detector developed to observe nuclear recoils from hypothetical weakly interacting massive dark matter particles. Discrimination between nuclear recoils and background electron recoils is afforded by recording both the scintillation and ionisation signals generated within the liquid xenon, with the ratio of these signals being different for the two classes of event. This ratio is calibrated for different incident species using an AmBe neutron source and 60Co γ-ray sources. From our first 31 live days of running ZEPLIN-II, the total exposure following the application of fiducial and stability cuts was 225 kg × days. A background population of radon progeny events was observed in this run, arising from radon emission in the gas purification getters, due to radon daughter ion decays on the surfaces of the walls of the chamber. An acceptance window, defined by the neutron calibration data, of 50% nuclear recoil acceptance between 5 keVee and 20 keVee, had an observed count of 29 events, with a summed expectation of 28.6 ± 4.3 γ-ray and radon progeny induced background events. These figures provide a 90% c.l. upper limit to the number of nuclear recoils of 10.4 events in this acceptance window, which converts to a WIMP–nucleon spin-independent cross-section with a minimum of 6.6×10−7 pb following the inclusion of an energy-dependent, calibrated, efficiency. A second run is currently underway in which the radon progeny will be eliminated, thereby removing the background population, with a projected sensitivity of 2×10−7 pb for similar exposures as the first run.
Achterberg A, Ackermann M, Adams J, et al., 2007, Five years of searches for point sources of astrophysical neutrinos with the AMANDA-II neutrino telescope, PHYSICAL REVIEW D, Vol: 75, ISSN: 1550-7998
Sumner TJ, 2007, Position sensitive detectors for astroparticle physics, 7th International Conference on Position-Sensitive Detectors, Publisher: ELSEVIER SCIENCE BV, Pages: 208-211, ISSN: 0168-9002
Bao G, Liu L, Shaul D, et al., 2007, Further computation of the test mass charging and disturbances in ASTROD I, 3rd International Conference on Particle and Fundamental Physics in Space, Publisher: ELSEVIER SCIENCE BV, Pages: 246-248, ISSN: 0920-5632
Lindote A, Araujo HM, da Cunha JP, et al., 2007, Preliminary results on position reconstruction for ZEPLIN III, 7th International Conference on Position-Sensitive Detectors, Publisher: ELSEVIER, Pages: 200-203, ISSN: 0168-9002
Akimov DY, Alner GJ, Araujo HM, et al., 2007, The ZEPLIN-III dark matter detector: Instrument design, manufacture and commissioning, Astroparticle Physics, Vol: 27, Pages: 46-60, ISSN: 1873-2852
We present details of the technical design, manufacture and testing of the ZEPLIN-III dark matter experiment. ZEPLIN-III is a twophasexenon detector which measures both the scintillation light and the ionisation charge generated in the liquid by interacting particlesand radiation. The instrument design is driven by both the physics requirements and by the technology requirements surrounding the useof liquid xenon. These include considerations of key performance parameters, such as the efficiency of scintillation light collection, restrictionsplaced on the use of materials to control the inherent radioactivity levels, attainment of high vacuum levels and chemical contaminationcontrol. The successful solution has involved a number of novel design and manufacturing features which will be of specific use tofuture generations of direct dark matter search experiments as they struggle with similar and progressively more demanding requirements.
Sumner TJ, Anderson J, Blaser J-P, et al., 2007, STEP (Satellite Test of the Equivalence Principle), ADV SPACE RES, Vol: 39, Pages: 254-258
Achterberg A, Ackermann M, Adams J, et al., 2006, Neutrino detectors in ICE: Results and perspectives, Pages: 87-101, ISSN: 1122-5157
The AMANDA neutrino detector has been in operation at the South Pole for several years. A number of searches for extraterrestrial sources of high energy neutrinos have been performed. A selection of results is presented in this paper. The much larger IceCube detector will extend the instrumented ice volume to a cubic kilometer and 9 out of 80 planned IceCube strings have been deployed to date. We present the status for both detectors.
Achterberg A, Ackermann M, Adams J, et al., 2006, Limits on the high-energy gamma and neutrino fluxes from the SGR 1806-20 giant flare of 27 December 2004 with the AMANDA-II detector, PHYSICAL REVIEW LETTERS, Vol: 97, ISSN: 0031-9007
Smith NJT, Murphy AS, Sumner TJ, 2006, Reply to: "Critical revision of the ZEPLIN-I sensitivity to WIMP interactions", PHYSICS LETTERS B, Vol: 642, Pages: 567-569, ISSN: 0370-2693
Achterberg A, Ackermann M, Adams J, et al., 2006, On the selection of AGN neutrino source candidates for a source stacking analysis with neutrino telescopes, ASTROPARTICLE PHYSICS, Vol: 26, Pages: 282-300, ISSN: 0927-6505
Shaul D N, et al, 2006, Solar And Cosmic Ray Physics And The Space Environment: Studies For And With LISA, LASER INTERFEROMETER SPACE ANTENNA: 6th International LISA Symposium, Publisher: AIP Press, Pages: 172-178, ISSN: 0094-243X
Wass P J, 2006, The LISA Pathfinder Radiation Monitor, LASER INTERFEROMETER SPACE ANTENNA: 6th International LISA Symposium, Publisher: AIP Press, Pages: 225-229, ISSN: 0094-243X
Ni W-T, Bao Y, Dittus H, et al., 2006, ASTROD I: Mission concept and Venus flybys, 5th IAA International Conference on Low-Cost Planetary Missions, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 598-607, ISSN: 0094-5765
Araujo HM, Akimov DY, Alner GJ, et al., 2006, The ZEPLIN-III dark matter detector: Performance study using an end-to-end simulation tool, Astroparticle Physics, Vol: 26, Pages: 140-153, ISSN: 1873-2852
We present results from a GEANT4-based Monte Carlo tool for end-to-end simulations of the ZEPLIN-III dark matter experiment.ZEPLIN-III is a two-phase detector which measures both the scintillation light and the ionisation charge generated in liquid xenon byinteracting particles and radiation. The software models the instrument response to radioactive backgrounds and calibration sources,including the generation, ray-tracing and detection of the primary and secondary scintillations in liquid and gaseous xenon, and subsequentprocessing by data acquisition electronics. A flexible user interface allows easy modification of detector parameters at run time.Realistic datasets can be produced to help with data analysis, an example of which is the position reconstruction algorithm developedfrom simulated data. We present a range of simulation results confirming the original design sensitivity of a few times 108 pb to theWIMP-nucleon cross-section.
Achterberg A, Ackermann M, Adams J, et al., 2006, Limits on the muon flux from neutralino annihilations at the center of the Earth with AMANDA, ASTROPARTICLE PHYSICS, Vol: 26, Pages: 129-139, ISSN: 0927-6505
Grimani C, et al, 2006, SEP flux mapping with PHOEBUS, 6th Edoardo Amaldi Conference on Gravitational Waves, Publisher: Institute of Physics Publishing, Pages: 6-11
Ni W-T, et al, 2006, ASTROD and ASTROD I: Progress Report, 6th Edoardo Amaldi Conference on Gravitational Waves, Publisher: Institute of Physics Publishing, Pages: 154-160
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