Background Model for the Majorana Demonstrator
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Background Model for the Majorana Demonstrator

  • Author(s): Cuesta, C
  • Abgrall, N
  • Aguayo, E
  • III, FT Avignone
  • Barabash, AS
  • Bertrand, FE
  • Boswell, M
  • Brudanin, V
  • Busch, M
  • Byram, D
  • Caldwell, AS
  • Chan, Y-D
  • Christofferson, CD
  • Combs, DC
  • Cuesta, C
  • Detwiler, JA
  • Doe, PJ
  • Efremenko, Yu
  • Egorov, V
  • Ejiri, H
  • Elliott, SR
  • Fast, JE
  • Finnerty, P
  • Fraenkle, FM
  • Galindo-Uribarri, A
  • Giovanetti, GK
  • Goett, J
  • Green, MP
  • Gruszko, J
  • Guiseppe, VE
  • Gusev, K
  • Hallin, AL
  • Hazama, R
  • Hegai, A
  • Henning, R
  • Hoppe, EW
  • Howard, S
  • Howe, MA
  • Keeter, KJ
  • Kidd, MF
  • Kochetov, O
  • Konovalov, SI
  • Kouzes, RT
  • LaFerriere, BD
  • Leon, J
  • Leviner, LE
  • Loach, JC
  • MacMullin, J
  • MacMullin, S
  • Martin, RD
  • Meijer, S
  • Mertens, S
  • Nomachi, M
  • Orrell, JL
  • O'Shaughnessy, C
  • Overman, NR
  • II, DG Phillips
  • Poon, AWP
  • Pushkin, K
  • Radford, DC
  • Rager, J
  • Rielage, K
  • Robertson, RGH
  • Romero-Romero, E
  • Ronquest, MC
  • Schubert, AG
  • Shanks, B
  • Shima, T
  • Shirchenko, M
  • Snavely, KJ
  • Snyder, N
  • Suriano, AM
  • Thompson, J
  • Timkin, V
  • Tornow, W
  • Trimble, JE
  • Varner, RL
  • Vasilyev, S
  • Vetter, K
  • Vorren, K
  • White, BR
  • Wilkerson, JF
  • Wiseman, C
  • Xu, W
  • Yakushev, E
  • Young, AR
  • Yu, CH
  • Yumatov, V
  • et al.
Abstract

The Majorana Collaboration is constructing a system containing 40 kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale in the inverted-hierarchy region. To realize this, a major goal of the Majorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials with analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements.

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