Recent Results from the Majorana Demonstrator
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Recent Results from the Majorana Demonstrator

  • Author(s): Gilliss, T
  • Alvis, SI
  • Arnquist, IJ
  • III, FTA
  • Barabash, AS
  • Barton, CJ
  • Bertrand, FE
  • Bode, T
  • 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
  • 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 Collaboration has completed construction and is now operating an array of high purity Ge detectors searching for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{76}$Ge. The array, known as the MAJORANA DEMONSTRATOR, is comprised of 44 kg of Ge detectors (30 kg enriched to 88% in $^{76}$Ge) installed in an ultra-low background compact shield at the Sanford Underground Research Facility in Lead, South Dakota. The primary goal of the DEMONSTRATOR is to establish a low-background design that can be scaled to a next-generation tonne-scale experiment. This work reports initial background levels in the $0\nu\beta\beta$ region of interest. Also presented are recent physics results leveraging P-type point-contact detectors with sub-keV energy thresholds to search for physics beyond the Standard Model; first results from searches for bosonic dark matter, solar axions, Pauli exclusion principle violation, and electron decay have been published. Finally, this work discusses the proposed tonne-scale $^{76}$Ge $0\nu\beta\beta$ LEGEND experiment.

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