Multisite event discrimination for the MAJORANA DEMONSTRATOR

Journal Article · Fri Jun 07 00:00:00 EDT 2019 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.99.065501· OSTI ID:1526382

Alvis, S. I.; Arnquist, I. J.; Avignone, F. T.; Barabash, A. S.; Barton, C. J.; Basu, V.; Bertrand, F. E.; Bos, B.; Buuck, M.; Caldwell, T. S.; Chan, Y-D.; Christofferson, C. D.; Chu, P. -H.; Cuesta, C.; Detwiler, J. A.; Ejiri, H.; 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.; Hehn, L.; Henning, R.; Hervas Aguilar, D.; Hoppe, E. W.; Howe, M. A.; Keeter, K. J.; Kidd, M. F.; Konovalov, S. I.; Kouzes, R. T.; Lopez, A. M.; Martin, R. D.; Massarczyk, R.; Meijer, S. J.; Mertens, S.; Myslik, J.; Othman, G.; Pettus, W.; Piliounis, A.; Poon, A. W. P.; Radford, D. C.; Rager, J.; Reine, A. L.; Rielage, K.; Ruof, N. W.; Shanks, B.; Shirchenko, M.; Tedeschi, D.; Varner, R. L.; Vasilyev, S.; White, B. R.; Wilkerson, J. F.; Wiseman, C.; Xu, W.; Yakushev, E.; Yu, C. -H.; Yumatov, V.; Zhitnikov, I.; Zhu, B. X.

The Majorana Demonstrator is searching for neutrinoless double-beta decay (0νββ) in 76Ge using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility. Background results in the 0νββ region of interest from data taken during construction, commissioning, and the start of full operations have been recently published. A pulse shape analysis cut applied to achieve this result, named AvsE, is described in this paper. This cut is developed to remove events whose waveforms are typical of multisite energy deposits while retaining (90±3.5)% of single-site events. This pulse shape discrimination is based on the relationship between the maximum current and energy, and tuned using 228Th calibration source data. The efficiency uncertainty accounts for variation across detectors, energy, and time, as well as for the position distribution difference between calibration and 0νββ events, established using simulations.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of North Carolina, Chapel Hill, NC (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Contributing Organization: Majorana Collaboration
• Grant/Contract Number: AC02-05CH11231; AC05-00OR22725; AC05-76RL0130; AC52-06NA25396; FG02-97ER41020; FG02-97ER41033; FG02-97ER41041; SC0010254; SC0012612; SC0014445; SC0018060; AC05-76RL01830; 89233218CNA000001
• OSTI ID: 1526382
• Alternate ID(s): OSTI ID: 1492335; OSTI ID: 1544790; OSTI ID: 1546222; OSTI ID: 1658900; OSTI ID: 1658940; OSTI ID: 1768539
• Report Number(s): PNNL-SA-140391; LA-UR-19-20305; PRVCAN
• Journal Information: Physical Review. C, Vol. 99, Issue 6; ISSN 2469-9985
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Neutrinoless double beta decay
Nucleus-neutrino interactions
59 ≤ A ≤ 89
Radiation detectors
Spectrometers & spectroscopic techniques
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Atomic
Nuclear and Particle Physics