Recent results from the MAJORANA DEMONSTRATOR

Myslik, J.; Alvis, S. I.; Arnquist, I. J.; Avignone, F. T.; Barabash, A. S.; Barton, C. J.; Bertrand, F.; Bode, T.; Bos, B.; Brudanin, V.; Busch, M.; Buuck, M.; Caldwell, T. S.; Christofferson, C. D.; Chu, Pinghan; Cuesta, C.; Detwiler, J. A.; Dunagan, C.; Efremenko, Y. V.; Ejiri, H.; Elliott, S. R.; Gilliss, T.; Giovanetti, G. K.; Green, M.P.; Gruszko, J.; Guinn, I. S.; Guiseppe, V.E.; Haufe, C. R.; Hegedus, R. J.; Hehn, L.; Henning, R.; Aguilar, D. Hervas; Hoppe, E.W.; Howe, M. A.; Keeter, K. J.; Kidd, M. F.; Konovalov, S.I.; Kouzes, R.T.; Lopez, A.M.; Martín, R. D.; Massarczyk, Ralph; Meijer, S. J.; Mertens, S.; Othman, G.; Pettus, W.; Piliounis, A.; Poon, A. W. P.; Radford, D. C.; Rager, J.; Reine, A. L.; Rielage, K.; Ruof, N. W.; Shanks, B.; Shirchenko, M.; Tedeschi, D. J.; Varner, R. L.; Vasilyev, S.; VASUNDHARA, .; White, B. R.; Wilkerson, J. F.; Wiseman, C.; Xu, W.; Yakushev, E.; Yu, C. H.; Yumatov, V.; Zhitnikov, I.; Zhu, B. X.

doi:10.22323/1.340.0635

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“…Before applying the pulse shape discrimination (PSD) cuts described above, instrumental backgrounds [13] and events with energy deposition in multiple detectors within a 4 µs coincidence window are removed. The spectrum shown in Figure 2 is the result of the combination of DS3 and DS4 and sequentially-applied AvsE and DCR cuts with an exposure of 1.39 kg-y.…”

Section: Background Rejection and Initial Resultsmentioning

confidence: 99%

Initial results from the Majorana Demonstrator

Caldwell

Abgrall

Alvis

et al. 2020

J. Phys.: Conf. Ser.

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The Majorana Collaboration has assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76 Ge 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 76 Ge) 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.

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Section: Background Rejection and Initial Resultsmentioning

confidence: 99%