Background Model for the Majorana Demonstrator

The Majorana Collaboration is constructing a system containing 40kg 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 Demonstrato...

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Veröffentlicht in:	Physics procedia 2015, Vol.61 (C), p.821-827
Hauptverfasser:	Cuesta, C., Abgrall, N., Aguayo, E., Avignone, F.T., Barabash, A.S., Bertrand, F.E., Boswell, M., Brudanin, V., Busch, M., Byram, D., Caldwell, A.S., Chan, Y-D., Christofferson, C.D., Combs, D.C., Detwiler, J.A., Doe, P.J., Efremenko, Yu, Egorov, V., Ejiri, H., Elliott, S.R., Fast, J.E., Finnerty, P., Fraenkle, F.M., Galindo-Uribarri, A., Giovanetti, G.K., Goett, J., Green, M.P., Gruszko, J., Guiseppe, V.E., Gusev, K., Hallin, A.L., Hazama, R., Hegai, A., Henning, R., Hoppe, E.W., Howard, S., Howe, M.A., Keeter, K.J., Kidd, M.F., Kochetov, O., Konovalov, S.I., Kouzes, R.T., LaFerriere, B.D., Leon, J., Leviner, L.E., Loach, J.C., MacMullin, J., MacMullin, S., Martin, R.D., Meijer, S., Mertens, S., Nomachi, M., Orrell, J.L., O'Shaughnessy, C., Overman, N.R., Phillips, D.G., Poon, A.W.P., Pushkin, K., Radford, D.C., Rager, J., Rielage, K., Robertson, R.G.H., Romero-Romero, E., Ronquest, M.C., Schubert, A.G., Shanks, B., Shima, T., Shirchenko, M., Snavely, K.J., Snyder, N., Suriano, A.M., Thompson, J., Timkin, V., Tornow, W., Trimble, J.E., Varner, R.L., Vasilyev, S., Vetter, K., Vorren, K., White, B.R., Wilkerson, J.F., Wiseman, C., Xu, W., Yakushev, E., Young, A.R., Yu, C.-H., Yumatov, V.
Format:	Artikel
Sprache:	eng
Schlagworte:	germanium detector INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY majorana neutrinoless double beta decay PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Beschreibung
Zusammenfassung:	The Majorana Collaboration is constructing a system containing 40kg 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.
ISSN:	1875-3892 1875-3892
DOI:	10.1016/j.phpro.2015.06.001