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Search Results: 1 - 10 of 462030 matches for " A. Empl "
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A. Fluka Study of Underground Cosmogenic Neutron Production
A Empl,E. V. Hungerford,R. Jasim,P. Mosteiro
Physics , 2014, DOI: 10.1088/1475-7516/2014/08/064
Abstract: Neutrons produced by cosmic muon interactions are important contributors to backgrounds in underground detectors when searching for rare events. Typically such neutrons can dominate the background, as they are particularly difficult to shield and detect. Since actual data is sparse and not well documented, simulation studies must be used to design shields and predict background rates. Thus validation of any simulation code is necessary to assure reliable results. This work compares in detail the predictions of the FLUKA simulation code to existing data, and uses this code to report a simulation of cosmogenic backgrounds for typical detectors embedded in a water tank with liquid scintillator shielding.
Study of Cosmogenic Neutron Backgrounds at LNGS
A. Empl,R. Jasim,E. Hungerford,P. Mosteiro
Physics , 2012,
Abstract: Cosmic muon interactions are important contributors to backgrounds in underground detectors when searching for rare events. Typically neutrons dominate this background as they are particularly difficult to shield and detect in a veto system. Since actual background data is sparse and not well documented, simulation studies must be used to design shields and predict background rates. This means that validation of any simulation code is necessary to assure reliable results. This work studies the validation of the FLUKA simulation code, and reports the results of a simulation of cosmogenic background for a liquid argon two-phase detector embedded within a water tank and liquid scintillator shielding.
The CLEAR Experiment
K. Scholberg,T. Wongjirad,E. Hungerford,A. Empl,D. Markoff,P. Mueller,Y. Efremenko,D. McKinsey,J. Nikkel
Physics , 2009,
Abstract: The Spallation Neutron Source in Oak Ridge, Tennessee, is designed to produce intense pulsed neutrons for various science and engineering applications. Copious neutrinos are a free by-product. When it reaches full power, the SNS will be the world's brightest source of neutrinos in the few tens of MeV range. The proposed CLEAR (Coherent Low Energy A (Nuclear) Recoils) experiment will measure coherent elastic neutral current neutrino-nucleus scattering at the SNS. The physics reach includes tests of the Standard Model.
A FLUKA Study of $β$-delayed Neutron Emission for the Ton-size DarkSide Dark Matter Detector
Anton Empl,Ed V. Hungerford
Physics , 2014,
Abstract: In the published cosmogenic background study for a ton-sized DarkSide dark matter search, only prompt neutron backgrounds coincident with cosmogenic muons or muon induced showers were considered, although observation of the initiating particle(s) was not required. The present paper now reports an initial investigation of the magnitude of cosmogenic background from $\beta$-delayed neutron emission produced by cosmogenic activity in DarkSide. The study finds a background rate for $\beta$-delayed neutrons in the fiducial volume of the detector on the order of < 0.1 event/year. However, detailed studies are required to obtain more precise estimates. The result should be compared to a radiogenic background event rate from the PMTs inside the DarkSide liquid scintillator veto of 0.2 events/year.
The FLUKA code: present applications and future developments
A. Fasso',A. Ferrari,S. Roesler,J. Ranft,P. R. Sala,G. Battistoni,M. Campanella,F. Cerutti,L. De Biaggi,E. Gadioli,M. V. Garzelli,F. Ballarini,A. Ottolenghi,D. Scannicchio,M. Carboni,M. Pelliccioni,R. Villari,V. Andersen,A. Empl,K. Lee,L. Pinsky,T. N. Wilson,N. Zapp
Physics , 2003,
Abstract: The main features of the FLUKA Monte Carlo code, which can deal with transport and interaction of electromagnetic and hadronic particles, are summarised. The physical models embedded in FLUKA are mentioned, as well as examples of benchmarking against experimental data. A short history of the code is provided and the following examples of applications are discussed in detail: prediction of calorimetric performances, atmospheric neutrino flux calculations, dosimetry in atmosphere and radiobiology applications, including hadrontherapy and space radiation protection. Finally a few lines are dedicated to the FLUKA server, from which the code can be downloaded.
A New Method for Measuring Coherent Elastic Neutrino Nucleus Scattering at an Off-Axis High-Energy Neutrino Beam Target
S. J. Brice,R. L. Cooper,F. DeJongh,A. Empl,L. M. Garrison,A. Hime,E. Hungerford,T. Kobilarcik,B. Loer,C. Mariani,M. Mocko,G. Muhrer,R. Pattie,Z. Pavlovic,E. Ramberg,K. Scholberg,R. Tayloe,R. T. Thornton,J. Yoo,A. Young
Physics , 2013, DOI: 10.1103/PhysRevD.89.072004
Abstract: We present a new experimental method for measuring the process of Coherent Elastic Neutrino Nucleus Scattering (CENNS). This method uses a detector situated transverse to a high energy neutrino beam production target. This detector would be sensitive to the low energy neutrinos arising from pion decays-at-rest in the target. We discuss the physics motivation for making this measurement and outline the predicted backgrounds and sensitivities using this approach. We report a measurement of neutron backgrounds as found in an off-axis surface location of the Fermilab Booster Neutrino Beam (BNB) target. The results indicate that the Fermilab BNB target is a favorable location for a CENNS experiment.
New Limit for the Family-Number Non-conserving Decay mu+ to e+_gamma
MEGA Collaboration,M. L. Brooks,Y. K. Chen,M. D. Cooper,P. S. Cooper,M. Dzemidzic,A. Empl,C. A. Gagliardi,G. E. Hogan,E. B. Hughes,E. V. Hungerford,C. C. H. Jui,J. E. Knott,D. D. Koetke,M. A. Kroupa K. A. Lan,R. Manweiler,B. W. Mayes,R. E. Mischke,L. E. Piilonen,T. D. S. Stanislaus,K. M. Stantz,J. J. Szymanski,R. E. Tribble,X. L. Tu,L. A. Van Ausdeln,W. H. von Witsch,S. C. Wright,K. O. H. Ziock
Physics , 1999, DOI: 10.1103/PhysRevLett.83.1521
Abstract: An experiment has been performed to search for the muon- and electron-number non-conserving decay mu+ to e+_gamma. The upper limit for the branching ratio to be GAMMA(mu+ to e+_gamma)/GAMMA(mu+ to e+_nu_nubar) < 1.2e-11 with 90% confidence.
Snowmass CF1 Summary: WIMP Dark Matter Direct Detection
P. Cushman,C. Galbiati,D. N. McKinsey,H. Robertson,T. M. P. Tait,D. Bauer,A. Borgland,B. Cabrera,F. Calaprice,J. Cooley,T. Empl,R. Essig,E. Figueroa-Feliciano,R. Gaitskell,S. Golwala,J. Hall,R. Hill,A. Hime,E. Hoppe,L. Hsu,E. Hungerford,R. Jacobsen,M. Kelsey,R. F. Lang,W. H. Lippincott,B. Loer,S. Luitz,V. Mandic,J. Mardon,J. Maricic,R. Maruyama,R. Mahapatra,H. Nelson,J. Orrell,K. Palladino,E. Pantic,R. Partridge,A. Ryd,T. Saab,B. Sadoulet,R. Schnee,W. Shepherd,A. Sonnenschein,P. Sorensen,M. Szydagis,T. Volansky,M. Witherell,D. Wright,K. Zurek
Physics , 2013,
Abstract: As part of the Snowmass process, the Cosmic Frontier WIMP Direct Detection subgroup (CF1) has drawn on input from the Cosmic Frontier and the broader Particle Physics community to produce this document. The charge to CF1 was (a) to summarize the current status and projected sensitivity of WIMP direct detection experiments worldwide, (b) motivate WIMP dark matter searches over a broad parameter space by examining a spectrum of WIMP models, (c) establish a community consensus on the type of experimental program required to explore that parameter space, and (d) identify the common infrastructure required to practically meet those goals.
Hypernuclear Spectroscopy using the (e,e'K+) Reaction
L. Yuan,M. Sarsour,T. Miyoshi,Z. Zhu,A. Ahmindouch,D. Androic,T. Angelescu,R. Asaturyan,S. Avery,O. K. Baker,I. Betovic,H. Breuer,R. Carlini,J. Cha,R. Chrien M. Christy,L. Cole,S. Danagoulian,D. Dehnhard,M. Elaasar,A. Empl,R. Ent,H. Fenker,Y. Fujii,M. Furic,L. Gan,K. Garrow,A. Gasparian,P. Gueye,M. harvey,O. Hashimoto,W. Hinton,B. Hu,E. Hungerford,C. Jackson,K. Johnston,H. Juengst,C. Keppel,K. Lan,Y. Liang,V. P. Likhachev,J. H. Liu,D. Mack,A. Margaryan,P. markowitz,H. Mkrtchyan,S. N. Nakamura,T. Petkovic,J. Reinhold,J. Roche,Y. Sato,R. Sawafta,N. Simicevic,G. Smith,S. Stepanyan,V. Tadevosyan,T. Takahashi,K. Tanida,L. Tang,M. Ukai,A. Uzzle,W. Vulcan,S. Wells,S. Wood,G. Xu,H. Yamaguchi,C. Yan
Physics , 2004, DOI: 10.1103/PhysRevC.73.044607
Abstract: A pioneering experiment in Lambda hypernuclear spectroscopy, undertaken at the Thomas Jefferson National Accelerator Facility (Jlab), was recently reported. The experiment used the high- precision, continuous electron beam at Jlab, and a special arrangement of spectrometer magnets to measure the spectrum from {nat}C and 7Li targets using the (e,e' K+)reaction. The 12B hypernuclear spectrum was previously published. This experiment is now reported in more detail, with improved results for the 12B hypernuclear spectrum. In addition, unpublished results of the 7He hypernuclear spectrum are also shown. This later spectrum indicates the need for a more detailed few-body calculation of the hypernucleus and the reaction process. The success of this experiment demonstrates that the (e,e'K+) reaction can be effectively used as a high resolution tool to study hypernuclear spectra, ant its use should be vigorously pursued.
Light Yield in DarkSide-10: a Prototype Two-phase Liquid Argon TPC for Dark Matter Searches
T. Alexander,D. Alton,K. Arisaka,H. O. Back,P. Beltrame,J. Benziger,G. Bonfini,A. Brigatti,J. Brodsky,L. Cadonati,F. Calaprice,A. Candela,H. Cao,P. Cavalcante,A. Chavarria,A. Chepurnov,D. Cline,A. G. Cocco,C. Condon,D. D'Angelo,S. Davini,E. De Haas,A. Derbin,G. Di Pietro,I. Dratchnev,D. Durben,A. Empl,A. Etenko,A. Fan,G. Fiorillo,K. Fomenko,F. Gabriele,C. Galbiati,S. Gazzana,C. Ghag,C. Ghiano,A. Goretti,L. Grandi,M. Gromov,M. Guan,C. Guo,G. Guray,E. V. Hungerford,Al. Ianni,An. Ianni,A. Kayunov,K. Keeter,C. Kendziora,S. Kidner,V. Kobychev,G. Koh,D. Korablev,G. Korga,E. Shields,P. Li,B. Loer,P. Lombardi,C. Love,L. Ludhova,L. Lukyanchenko,A. Lund,K. Lung,Y. Ma,I. Machulin,J. Maricic,C. J. Martoff,Y. Meng,E. Meroni,P. D. Meyers,T. Mohayai,D. Montanari,M. Montuschi,P. Mosteiro,B. Mount,V. Muratova,A. Nelson,A. Nemtzow,N. Nurakhov,M. Orsini,F. Ortica,M. Pallavicini,E. Pantic,S. Parmeggiano,R. Parsells,N. Pelliccia,L. Perasso,F. Perfetto,L. Pinsky,A. Pocar,S. Pordes,G. Ranucci,A. Razeto,A. Romani,N. Rossi,P. Saggese,R. Saldanha,C. Salvo,W. Sands,M. Seigar,D. Semenov,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,J. Tatarowicz,G. Testera,A. Teymourian,J. Thompson,E. Unzhakov,R. B. Vogelaar,H. Wang,S. Westerdale,M. Wojcik,A. Wright,J. Xu,C. Yang,S. Zavatarelli,M. Zehfus,W. Zhong,G. Zuzel
Physics , 2012, DOI: 10.1016/j.astropartphys.2013.08.004
Abstract: As part of the DarkSide program of direct dark matter searches using liquid argon TPCs, a prototype detector with an active volume containing 10 kg of liquid argon, DarkSide-10, was built and operated underground in the Gran Sasso National Laboratory in Italy. A critically important parameter for such devices is the scintillation light yield, as photon statistics limits the rejection of electron-recoil backgrounds by pulse shape discrimination. We have measured the light yield of DarkSide-10 using the readily-identifiable full-absorption peaks from gamma ray sources combined with single-photoelectron calibrations using low-occupancy laser pulses. For gamma lines of energies in the range 122-1275 keV, we get consistent light yields averaging 8.887+-0.003(stat)+-0.444(sys) p.e./keVee. With additional purification, the light yield measured at 511 keV increased to 9.142+-0.006(stat) p.e./keVee.
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