The Majorana Demonstrator: A search for neutrinoless double-beta decay of germanium-76

Conference Paper

The Majorana collaboration is searching for neutrinoless double beta decay using 76Ge, which has been shown to have a number of advantages in terms of sensitivities and backgrounds. The observation of neutrinoless double-beta decay would show that lepton number is violated and that neutrinos are Majorana particles and would simultaneously provide information on neutrino mass. Attaining sensitivities for neutrino masses in the inverted hierarchy region, 15 - 50 meV, will require large, tonne-scale detectors with extremely low backgrounds, at the level of ∼1 count/t-y or lower in the region of the signal. The Majorana collaboration, with funding support from DOE Office of Nuclear Physics and NSF Particle Astrophysics, is constructing the Demonstrator, an array consisting of 40 kg of p-type point-contact high-purity germanium (HPGe) detectors, of which ∼30 kg will be enriched to 87% in 76Ge. The Demonstrator is being constructed in a clean room laboratory facility at the 4850' level (4300 m.w.e.) of the Sanford Underground Research Facility (SURF) in Lead, SD. It utilizes a compact graded shield approach with the inner portion consisting of ultra-clean Cu that is being electroformed and machined underground. The primary aim of the Demonstrator is to show the feasibility of a future tonne-scale measurement in terms of backgrounds and scalability. © 2013 AIP Publishing LLC.

Full Text

Duke Authors

Cited Authors

  • Elliott, SR; Abgrall, N; Aguayo, E; Avignone, FT; Barabash, AS; Bertrand, FE; Boswell, M; Brudanin, V; Busch, M; Caldwell, AS; Chan, YD; Christofferson, CD; Combs, DC; Detwiler, JA; Doe, PJ; Efremenko, Y; Egorov, V; Ejiri, H; Esterline, J; 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, S; Martin, RD; Mertens, S; Mizouni, L; Nomachi, M; Orrell, JL; O'Shaughnessy, C; Overman, NR; Phillips, DG; Poon, AWP; Pushkin, K; Radford, DC; Rielage, K; Robertson, RGH; Ronquest, MC; Schubert, AG; Shanks, B; Shima, T; Shirchenko, M; Snavely, KJ; Snyder, N; Soin, A; Strain, J; Suriano, AM; Timkin, V; Tornow, W; Varner, RL; Vasilyev, S; Vetter, K; Vorren, K; White, BR; Wilkerson, JF; Xu, W; Yakushev, E; Young, AR; Yu, CH; Yumatov, V

Published Date

  • January 1, 2014

Published In

Volume / Issue

  • 1572 /

Start / End Page

  • 45 - 48

Electronic International Standard Serial Number (EISSN)

  • 1551-7616

International Standard Serial Number (ISSN)

  • 0094-243X

International Standard Book Number 13 (ISBN-13)

  • 9780735412002

Digital Object Identifier (DOI)

  • 10.1063/1.4856546

Citation Source

  • Scopus