Results of the MAJORANA DEMONSTRATOR’s Search for Double-Beta Decay of 76Ge to Excited States of 76Se
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ID: 114365
2020
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.
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| Authors | I.S. Guinn,I.J. Arnquist,F.T. Avignone,A.S. Barabash,C. J. Barton,F.E. Bertrand,B. Bos,M. Busch,M. Buuck,T.S. Caldwell,Y-D. Chan,C.D. Christofferson,P-H. Chu,M.L. Clark,C. Cuesta,J.A. Detwiler,A. Drobizhev,D. W. Edwins,Yu. Efremenko,H. Ejiri,S.R. Elliott,T. Gilliss,G.K. Giovanetti,M.P. Green,J. Gruszko,V.E. Guiseppe,C.R. Haufe,R.J. Hegedus,R. Henning,D. Hervas Aguilar,E.W. Hoppe,A. Hostiuc,M.F. Kidd,I. Kim,R.T. Kouzes,A.M. Lopez,J.M. López-Castaño,E. L. Martin,R.D. Martin,R. Massarczyk,S.J. Meijer,S. Mertens,J. Myslik,T.K. Oli,G. Othman,W. Pettus,A.W.P. Poon,D.C. Radford,J. Rager,A.L. Reine,K. Rielage,N.W. Ruof,M.J. Stortini,D. Tedeschi,R.L. Varner,J.F. Wilkerson,C. Wiseman,W. Xu,C.-H. Yu,B.X. Zhu;I.S. Guinn;I.J. Arnquist;F.T. Avignone;A.S. Barabash;C. J. Barton;F.E. Bertrand;B. Bos;M. Busch;M. Buuck;T.S. Caldwell;Y-D. Chan;C.D. Christofferson;P-H. Chu;M.L. Clark;C. Cuesta;J.A. Detwiler;A. Drobizhev;D. W. Edwins;Yu. Efremenko;H. Ejiri;S.R. Elliott;T. Gilliss;G.K. Giovanetti;M.P. Green;J. Gruszko;V.E. Guiseppe;C.R. Haufe;R.J. Hegedus;R. Henning;D. Hervas Aguilar;E.W. Hoppe;A. Hostiuc;M.F. Kidd;I. Kim;R.T. Kouzes;A.M. Lopez;J.M. López-Castaño;E. L. Martin;R.D. Martin;R. Massarczyk;S.J. Meijer;S. Mertens;J. Myslik;T.K. Oli;G. Othman;W. Pettus;A.W.P. Poon;D.C. Radford;J. Rager;A.L. Reine;K. Rielage;N.W. Ruof;M.J. Stortini;D. Tedeschi;R.L. Varner;J.F. Wilkerson;C. Wiseman;W. Xu;C.-H. Yu;B.X. Zhu; |
| Journal | journal of physics: conference series |
| Year | 2020 |
| DOI | 10.1088/1742-6596/1468/1/012115 |
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