Recent results of the Majorana Demonstrator experiment

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ID: 111509
2019
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Abstract
The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850’ level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.
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Authors J. M. López-Castaño,S. I. Alvis,I. J. Arnquist,F. T. Avignone,A. S. Barabash,C. J. Barton,V. Basu,F. E. Bertrand,B. Bos,V. Brudanin,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,I. S. Guinn,V. E. Guiseppe,C. R. Haufe,R. J. Hegedus,R. Henning,D. Hervas Aguilar,E. W. Hoppe,A. Hostiuc,M. A. Howe,K. J. Keeter,M. F. Kidd,S. I. Konovalov,R. T. Kouzes,A. M. Lopez,E. Martin,R. D. Martin,R. Massarczyk,S. J. Meijer,S. Mertens,J. Myslik,T. K. Oli,G. Othman,W. Pettus,A. Piliounis,A. W. P. Poon,D. C. Radford,J. Rager,A. L. Reine,K. Rielage,N. W. Ruof,B. Shanks,M. Shirchenko,D. Tedeschi,R. L. Varner,S. Vasilyev,B. R. White,J. F. Wilkerson,C. Wiseman,W. Xu,E. Yakushev,C.-H. Yu,V. Yumatov,I. Zhitnikov,B. X. Zhu;J. M. López-Castaño;S. I. Alvis;I. J. Arnquist;F. T. Avignone;A. S. Barabash;C. J. Barton;V. Basu;F. E. Bertrand;B. Bos;V. Brudanin;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;I. S. Guinn;V. E. Guiseppe;C. R. Haufe;R. J. Hegedus;R. Henning;D. Hervas Aguilar;E. W. Hoppe;A. Hostiuc;M. A. Howe;K. J. Keeter;M. F. Kidd;S. I. Konovalov;R. T. Kouzes;A. M. Lopez;E. Martin;R. D. Martin;R. Massarczyk;S. J. Meijer;S. Mertens;J. Myslik;T. K. Oli;G. Othman;W. Pettus;A. Piliounis;A. W. P. Poon;D. C. Radford;J. Rager;A. L. Reine;K. Rielage;N. W. Ruof;B. Shanks;M. Shirchenko;D. Tedeschi;R. L. Varner;S. Vasilyev;B. R. White;J. F. Wilkerson;C. Wiseman;W. Xu;E. Yakushev;C.-H. Yu;V. Yumatov;I. Zhitnikov;B. X. Zhu;
Journal workshop on calculation of double-beta-decay matrix elements (medex’19)
Year 2019
DOI
10.1063/1.5130979
URL
https://sciprofiles.com/publication/view/88c7a51a7a9d091db7faa89557816227
Keywords
beta decay germanium detectors 76ge double beta neutrinoless double majorana demonstrator

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