Progress Toward A $2νββ$ Measurement For The Majorana Demonstrator
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Progress Toward A $2νββ$ Measurement For The Majorana Demonstrator

  • Author(s): Gilliss, T
  • Abgrall, N
  • Alvis, SI
  • Arnquist, IJ
  • III, FTA
  • Barabash, AS
  • Barton, CJ
  • Bertrand, FE
  • Bode, T
  • Bradley, AW
  • Brudanin, V
  • Busch, M
  • Buuck, M
  • Caldwell, TS
  • Chan, Y-D
  • Christofferson, CD
  • Chu, P-H
  • Cuesta, C
  • Detwiler, JA
  • Dunagan, C
  • Efremenko, Y
  • Ejiri, H
  • Elliott, SR
  • Giovanetti, GK
  • Green, MP
  • Gruszko, J
  • Guinn, IS
  • Guiseppe, VE
  • Haufe, CR
  • Hehn, L
  • Henning, R
  • Hoppe, EW
  • Howe, MA
  • Keeter, KJ
  • Kidd, MF
  • Konovalov, SI
  • Kouzes, RT
  • Lopez, AM
  • Martin, RD
  • Massarczyk, R
  • Meijer, SJ
  • Mertens, S
  • Myslik, J
  • O'Shaughnessy, C
  • Othman, G
  • Pettus, W
  • Poon, AWP
  • Radford, DC
  • Rager, J
  • Reine, AL
  • Rielage, K
  • Robertson, RGH
  • Ruof, NW
  • Shanks, B
  • Shirchenko, M
  • Suriano, AM
  • Tedeschi, D
  • Trimble, JE
  • Varner, RL
  • Vasilyev, S
  • Vetter, K
  • Vorren, K
  • White, BR
  • Wilkerson, JF
  • Wiseman, C
  • Xu, W
  • Yakushev, E
  • Yu, C-H
  • Yumatov, V
  • Zhitnikov, I
  • Zhu, BX
  • et al.
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.

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