The Majorana project
Building a 0νβ β experiment with the ability to probe neutrino mass in the inverted hierarchy region requires the combination of a large detector mass sensitive to 0νβ β, on the order of 1-tonne, and unprecedented background levels, on the order of or less than 1 count per year in the 0νβ β signal region. The Majorana Collaboration proposes a design based on using high-purity enriched 76Ge crystals deployed in ultra- low background electroformed Cu cryostats and using modern analysis techniques that should be capable of reaching the required sensitivity while also being scalable to a 1- tonne size. To demonstrate feasibility, the collaboration plans to construct a prototype system, the Majorana Demonstrator, consisting of 30 kg of 86% enriched 76Ge detectors and 30 kg of natural or isotope-76-depleted Ge detectors. We plan to deploy and evaluate two different Ge detector technologies, one based on a p-type configuration and the other on n-type. © 2009 IOP Publishing Ltd.
Elliott, SR; Aalseth, CE; Akashi-Ronquest, M; Amman, M; Amsbaugh, JF; Avignone, FT; Back, HO; Baktash, C; Barabash, AS; Barbeau, P; Beene, JR; Bergevin, M; Bertrand, FE; Boswell, M; Brudanin, V; Bugg, W; Burritt, TH; Chan, YD; Cianciolo, TV; Collar, J; Creswick, R; Cromaz, M; Detwiler, JA; Doe, PJ; Dunmore, JA; Efremenko, Y; Egorov, V; Ejiri, H; Ely, J; Esterline, J; Farach, H; Farmer, T; Fast, J; Finnerty, P; Fujikawa, B; Gehman, VM; Greenberg, C; Guiseppe, VE; Gusey, K; Hallin, AL; Hazama, R; Henning, R; Hime, A; Hossbach, T; Hoppe, E; Howe, MA; Hurley, D; Hyronimus, B; Johnson, RA; Keillor, M; Keller, C; Kephart, J; Kidd, M; Kochetov, O; Konovalov, SI; Kouzes, RT; Lesko, KT; Leviner, L; Luke, P; MacMullin, S; Marino, MG; McDonald, AB; Mei, DM; Miley, HS; Myers, AW; Nomachi, M; Odom, B; Orrell, J; Poon, AWP; Prior, G; Radford, DC; Reeves, JH; Rielage, K; Riley, N; Robertson, RGH; Rodriguez, L; Rykaczewski, KP; Schubert, AG; Shima, T; Shirchenko, M; Timkin, V; Thompson, R; Tornow, W; Tull, C; Van Wechel, TD; Vanyushin, I; Varner, RL; Vetter, K; Warner, R; Wilkerson, JF; Wouters, JM; Yakushev, E; Young, AR; Yu, CH; Yumatov, V; Yin, ZB
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