/ physics.ins-det arXiv:1711.05801

Progress Toward A $2\nu\beta\beta$ Measurement For The Majorana Demonstrator

Gilliss, T. (TUNL, Durham) ; Abgrall, N. (LBNL, NSD) ; Alvis, S.I. (CENPA, Seattle) ; Arnquist, I.J. (PNL, Richland) ; Avignone, F.T., III (Oak Ridge) ; Barabash, A.S. (Moscow, ITEP) ; Barton, C.J. (South Dakota U.) ; Bertrand, F.E. (Oak Ridge) ; Bode, T. (Munich, Max Planck Inst.) ; Bradley, A.W. (LBNL, NSD) ; Brudanin, V. (Dubna, JINR) ; Busch, M. (TUNL, Durham) ; Buuck, M. (CENPA, Seattle) ; Caldwell, T.S. (TUNL, Durham) ; Chan, Y-D (LBNL, NSD) ; Christofferson, C.D. (South Dakota Sch. Mines Tech.) ; Chu, P. -H (Los Alamos) ; Cuesta, C. (CENPA, Seattle) ; Detwiler, J.A. (CENPA, Seattle) ; Dunagan, C. (South Dakota Sch. Mines Tech.) ; Efremenko, Yu (Oak Ridge) ; Elliott, S.R. (Los Alamos) ; Giovanetti, G.K. (Princeton U.) ; Green, M.P. (Oak Ridge) ; Gruszko, J. (CENPA, Seattle) ; Guinn, I.S. (CENPA, Seattle) ; Guiseppe, V.E. (South Carolina U.) ; Haufe, C.R. (TUNL, Durham) ; Hehn, L. (LBNL, NSD) ; Henning, R. (TUNL, Durham) ; Hoppe, E.W. (PNL, Richland) ; Howe, M.A. (TUNL, Durham) ; Keeter, K.J. (Black Hills State U.) ; Kidd, M.F. (Tennessee Tech. U.) ; Konovalov, S.I. (Moscow, ITEP) ; Kouzes, R.T. (PNL, Richland) ; Lopez, A.M. (Tennessee U.) ; Martin, R.D. (Queen's U., Kingston) ; Massarczyk, R. (Los Alamos) ; Meijer, S.J. (TUNL, Durham) ; Mertens, S. (Munich, Tech. U.) ; Myslik, J. (LBNL, NSD) ; O'Shaughnessy, C. (TUNL, Durham) ; Othman, G. (TUNL, Durham) ; Pettus, W. (CENPA, Seattle) ; Poon, A. W P (LBNL, NSD) ; Radford, D.C. (Oak Ridge) ; Rager, J. (TUNL, Durham) ; Reine, A.L. (TUNL, Durham) ; Rielage, K. (Los Alamos) ; Robertson, R. G H (CENPA, Seattle) ; Ruof, N.W. (CENPA, Seattle) ; Shanks, B. (TUNL, Durham) ; Shirchenko, M. (Dubna, JINR) ; Suriano, A.M. (South Dakota Sch. Mines Tech.) ; Tedeschi, D. (South Carolina U.) ; Trimble, J.E. (TUNL, Durham) ; Varner, R.L. (Oak Ridge) ; Vasilyev, S. (Dubna, JINR) ; Vetter, K. (LBNL, NSD) ; Vorren, K. (TUNL, Durham) ; White, B.R. (Los Alamos) ; Wilkerson, J.F. (Oak Ridge) ; Wiseman, C. (South Carolina U.) ; Xu, W. (South Dakota U.) ; Yakushev, E. (Dubna, JINR) ; Yu, C. -H (Oak Ridge) ; Yumatov, V. (Moscow, ITEP) ; Zhitnikov, I. (Dubna, JINR) ; Zhu, B.X. (Los Alamos)

Pages: 5

Abstract: The MAJORANA DEMONSTRATOR is a $^{76}$Ge-based neutrinoless double-beta decay ($0\nu\beta\beta$) experiment. Staged at the 4850 ft level of the Sanford Underground Research Facility, the DEMONSTRATOR operates an array of high-purity p-type point contact Ge detectors deployed within a graded passive shield and an active muon veto system. The present work concerns the two-neutrino double-beta decay mode ($2\nu\beta\beta$) of $^{76}$Ge. For Ge detectors, having superior energy resolution (0.1%), this mode poses negligible background to the $0\nu\beta\beta$ mode, even for a ton-scale experiment. However, the measurement of the $2\nu\beta\beta$ mode allows for careful systematics checks of active detector mass, enrichment fraction, and pulse shape discrimination cuts related to both the $0\nu\beta\beta$ and $2\nu\beta\beta$ decay modes. A precision measurement of the $2\nu\beta\beta$ shape also allows searches for spectral distortions, possibly indicative of new physics, including $0\nu\beta\beta\chi$. Work is underway to construct a full experimental background model enabling a Bayesian fit to the measured energy spectrum and extraction of a precise $2\nu\beta\beta$ spectrum and half-life.

Web-Page: http://inspirehep.net/record/1636795/files/art_MJDInitialData_Cuts.png; http://inspirehep.net/record/1636795/files/art_Figure23.png; http://inspirehep.net/record/1636795/files/arXiv:1711.05801.pdf

Note: 5 pages, 2 figures, TAUP 2017: XV International Conference on Topics in Astroparticle and Underground Physics

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 Record created 2017-12-04, last modified 2017-12-04

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