- Main
Results of the MAJORANA DEMONSTRATOR’s Search for Double-Beta Decay of 76Ge to Excited States of 76Se
- Guinn, IS;
- Arnquist, IJ;
- Avignone, FT;
- Barabash, AS;
- Barton, CJ;
- Bertrand, FE;
- Bos, B;
- Busch, M;
- Buuck, M;
- Caldwell, TS;
- Chan, Y-D;
- Christofferson, CD;
- Chu, P-H;
- Clark, ML;
- Cuesta, C;
- Detwiler, JA;
- Drobizhev, A;
- Edwins, DW;
- Efremenko, Yu;
- Ejiri, H;
- Elliott, SR;
- Gilliss, T;
- Giovanetti, GK;
- Green, MP;
- Gruszko, J;
- Guiseppe, VE;
- Haufe, CR;
- Hegedus, RJ;
- Henning, R;
- Aguilar, D Hervas;
- Hoppe, EW;
- Hostiuc, A;
- Kidd, MF;
- Kim, I;
- Kouzes, RT;
- Lopez, AM;
- López-Castaño, JM;
- Martin, EL;
- Martin, RD;
- Massarczyk, R;
- Meijer, SJ;
- Mertens, S;
- Myslik, J;
- Oli, TK;
- Othman, G;
- Pettus, W;
- Poon, AWP;
- Radford, DC;
- Rager, J;
- Reine, AL;
- Rielage, K;
- Ruof, NW;
- Stortini, MJ;
- Tedeschi, D;
- Varner, RL;
- Wilkerson, JF;
- Wiseman, C;
- Xu, W;
- Yu, C-H;
- Zhu, BX
- et al.
Published Web Location
https://doi.org/10.1088/1742-6596/1468/1/012115Abstract
The MAJORANA DEMONSTRATOR is searching for double-beta decay of 76Ge to excited states (E.S.) in 76Se using a modular array of high purity Germanium detectors. 76Ge can decay into three E.S.s of 76Se. The E.S. decays have a clear event signature consisting of a ββ-decay with the prompt emission of one or two γ-rays, resulting in with high probability in a multi-site event. The granularity of the DEMONSTRATOR detector array enables powerful discrimination of this event signature from backgrounds. Using 21.3 kg-y of isotopic exposure, the DEMONSTRATOR has set world leading limits for each E.S. decay, with 90% CL lower half-life limits in the range of (0.56 2.1) ⋅ 1024 y. In particular, for the 2v transition to the first 0+ E.S. of 76Se, a lower half-life limit of 0.68 ⋅ 1024 at 90% CL was achieved.
Main Content
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