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α -event characterization and rejection in point-contact HPGe detectors.
Arnquist, I J; Avignone, F T; Barabash, A S; Barton, C J; Bertrand, F E; Blalock, E; Bos, B; Busch, M; Buuck, M; Caldwell, T S; Chan, Y-D; Christofferson, C D; Chu, P-H; Clark, M L; Cuesta, C; Detwiler, J A; Drobizhev, A; Edwards, T R; Edwins, D W; Edzards, F; Efremenko, Y; Elliott, S R; Gilliss, T; Giovanetti, G K; Green, M P; Gruszko, J; Guinn, I S; Guiseppe, V E; Haufe, C R; Hegedus, R J; Henning, R; Aguilar, D Hervas; Hoppe, E W; Hostiuc, A; Kim, I; Kouzes, R T; Lopez, A M; López-Castaño, J M; Martin, E L; Martin, R D; Massarczyk, R; Meijer, S J; Mertens, S; Myslik, J; Oli, T K; Othman, G; Pettus, W; Poon, A W P; Radford, D C; Rager, J.
Affiliation
  • Arnquist IJ; Pacific Northwest National Laboratory, Richland, WA 99354 USA.
  • Avignone FT; Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208 USA.
  • Barabash AS; Oak Ridge National Laboratory, Oak Ridge, TN 37830 USA.
  • Barton CJ; National Research Center "Kurchatov Institute" Institute for Theoretical and Experimental Physics, Moscow, 117218 Russia.
  • Bertrand FE; Department of Physics, University of South Dakota, Vermillion, SD 57069 USA.
  • Blalock E; Oak Ridge National Laboratory, Oak Ridge, TN 37830 USA.
  • Bos B; Department of Physics, North Carolina State University, Raleigh, NC 27695 USA.
  • Busch M; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Buuck M; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Caldwell TS; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514 USA.
  • Chan YD; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Christofferson CD; Department of Physics, Duke University, Durham, NC 27708 USA.
  • Chu PH; Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, WA 98195 USA.
  • Clark ML; Present Address: SLAC National Accelerator Laboratory, Menlo Park, CA 94025 USA.
  • Cuesta C; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Detwiler JA; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514 USA.
  • Drobizhev A; Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA.
  • Edwards TR; South Dakota School of Mines and Technology, Rapid City, SD 57701 USA.
  • Edwins DW; Los Alamos National Laboratory, Los Alamos, NM 87545 USA.
  • Edzards F; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Efremenko Y; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514 USA.
  • Elliott SR; Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, WA 98195 USA.
  • Gilliss T; Present Address: Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, 28040 Madrid Spain.
  • Giovanetti GK; Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, WA 98195 USA.
  • Green MP; Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA.
  • Gruszko J; Department of Physics, University of South Dakota, Vermillion, SD 57069 USA.
  • Guinn IS; Los Alamos National Laboratory, Los Alamos, NM 87545 USA.
  • Guiseppe VE; Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208 USA.
  • Haufe CR; Max-Planck-Institut für Physik, 80805 Munich, Germany.
  • Hegedus RJ; Present Address: Physik-Department, Technische Universität, 85748 Munich, Germany.
  • Henning R; Oak Ridge National Laboratory, Oak Ridge, TN 37830 USA.
  • Aguilar DH; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37916 USA.
  • Hoppe EW; Los Alamos National Laboratory, Los Alamos, NM 87545 USA.
  • Hostiuc A; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Kim I; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514 USA.
  • Kouzes RT; Present Address: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723 USA.
  • Lopez AM; Physics Department, Williams College, Williamstown, MA 01267 USA.
  • López-Castaño JM; Oak Ridge National Laboratory, Oak Ridge, TN 37830 USA.
  • Martin EL; Department of Physics, North Carolina State University, Raleigh, NC 27695 USA.
  • Martin RD; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Massarczyk R; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Meijer SJ; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514 USA.
  • Mertens S; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Myslik J; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514 USA.
  • Oli TK; Oak Ridge National Laboratory, Oak Ridge, TN 37830 USA.
  • Othman G; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Pettus W; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514 USA.
  • Poon AWP; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
  • Radford DC; Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27514 USA.
  • Rager J; Triangle Universities Nuclear Laboratory, Durham, NC 27708 USA.
Eur Phys J C Part Fields ; 82(3): 226, 2022.
Article in En | MEDLINE | ID: mdl-35310515
ABSTRACT
P-type point contact (PPC) HPGe detectors are a leading technology for rare event searches due to their excellent energy resolution, low thresholds, and multi-site event rejection capabilities. We have characterized a PPC detector's response to α particles incident on the sensitive passivated and p + surfaces, a previously poorly-understood source of background. The detector studied is identical to those in the Majorana Demonstrator experiment, a search for neutrinoless double-beta decay ( 0 ν ß ß ) in 76 Ge. α decays on most of the passivated surface exhibit significant energy loss due to charge trapping, with waveforms exhibiting a delayed charge recovery (DCR) signature caused by the slow collection of a fraction of the trapped charge. The DCR is found to be complementary to existing methods of α identification, reliably identifying α background events on the passivated surface of the detector. We demonstrate effective rejection of all surface α events (to within statistical uncertainty) with a loss of only 0.2% of bulk events by combining the DCR discriminator with previously-used methods. The DCR discriminator has been used to reduce the background rate in the 0 ν ß ß region of interest window by an order of magnitude in the Majorana Demonstrator  and will be used in the upcoming LEGEND-200 experiment.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Eur Phys J C Part Fields Year: 2022 Document type: Article
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Eur Phys J C Part Fields Year: 2022 Document type: Article