Initial results from the Majorana Demonstrator

The Majorana Collaboration has assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge with the goal of establishing the required background and scalability of a Ge-based next-generation ton-scale experiment. The Majorana Demonstrator consists of 44 kg of...

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Published in:Journal of physics. Conference series 2020-01, Vol.1342 (1), p.12023
Main Authors: Caldwell, T S, Abgrall, N, Alvis, S I, Arnquist, I J, Avignone, F T, Barabash, A S, Barton, C J, Bertrand, F E, Bode, T, Bos, B, Bradley, A W, Brudanin, V, Busch, M, Buuck, M, Y-D, Chan, Christofferson, C D, Chu, P-H, Cuesta, C, Detwiler, J A, Dunagan, C, Efremenko, Yu, Ejiri, H, Elliott, S R, Gilliss, T, Giovanetti, G K, Green, M P, Gruszko, J, Guinn, I S, Guiseppe, V E, Haufe, C R, Hehn, L, Henning, R, 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, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, A W P, Radford, D C, Rager, J, Reine, A L, Rielage, K, Robertson, R G H, Ruof, N W, Shanks, B, Shirchenko, M, Suriano, A M, Tedeschi, D, Trimble, J E, Varner, R L, Vasilyev, S, Vetter, K, Vorren, K, White, B R, Wilkerson, J F, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, Zhu, B X
Format: Article
Language:English
Subjects:
Arrays
Beta decay
Data acquisition
Detectors
Physics
Point contact
Purity
Research facilities
Sensors
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Summary:The Majorana Collaboration has assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge with the goal of establishing the required background and scalability of a Ge-based next-generation ton-scale experiment. The Majorana Demonstrator consists of 44 kg of high-purity Ge (HPGe) detectors (30 kg enriched in 76Ge) with a low-noise p-type point contact (PPC) geometry. The detectors are split between two modules which are contained in a single lead and high-purity copper shield at the Sanford Underground Research Facility in Lead, South Dakota. Following a commissioning run that started in June 2015, the full detector array has been acquiring data since August 2016. We will discuss the status of the Majorana Demonstrator and initial results from the first physics run; including current background estimates, exotic low-energy physics searches, projections on the physics reach of the Demonstrator, and implications for a ton-scale Ge-based neutrinoless double-beta decay search.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1342/1/012023