The Majorana Demonstrator Status and Preliminary Results

C. -H. Yu (1) , S. I. Alvis (2) , I. J. Arnquist (3) , F. T. Avignone III (1 , 4) , A. S. Barabash (5) , C. J. Barton (6) , F. E. Bertrand (1)

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T. Bode (7) V. Brudanin (8) M. Busch (9 10) M. Buuck (2) T. S. Caldwell (9 11) Y. -D. Chan (12) C. D. Christofferson (13) P. -H. Chu (14) C. Cuesta (2) J. A. Detwiler (2) C. Dunagan (13) Yu Efremenko (1 15) H. Ejiri (16) S. R. Elliott (14) T. Gilliss (9 G. K. Giovanetti (17) M. Green (1 9 18) J. Gruszko (19) I. S. Guinn (2) V. E. Guiseppe (4) C. R. Haufe (9 L. Hehn (12) R. Henning (9 E. W. Hoppe (3) M. A. Howe (9 K. J. Keeter (20) M. F. Kidd (21) S. I. Konovalov (5) R. T. Kouzes (3) A. M. Lopez (15) R. D. Martin (22) R. Massarczyk (14) S. J. Meijer (9 S. Mertens (7 23) J. Myslik (12) G. Othman (9 W. Pettus (2) A. W. P. Poon (12) D. C. Radford (1) J. Rager (9 A. L. Reine (9 K. Rielage (14) N. W. Ruff (2) B. Shanks (1) M. Shirchenko (8) A. M. Suriano (13) D. Tedeschi (4) R. L. Varner (1) S. Vasilyev (8) K. Vetter (12) K. Vorren (9 B. R. White (14) J. F. Wilkerson (1 C. Wiseman (4) W. Xu (6) E. Yakushev (8) V. Yumatov (5) I. Zhitnikov (8) B. Z. Zhu (14) (The Majorana Collaboration) ((1) Oak Ridge National Laboratory Oak Ridge TN USA (2) Center for Experimental Nuclear Physics Astrophysics Department of Physics University of Washington WA (3) Pacific Northwest National Laboratory Richland (4) Department of Physics Astronomy University of South Carolina Columbia SC (5) National Research Center Kurchatov Institute Institute for Theoretical Experimental Physics Moscow Russia (6) Department of Physics University of South Dakota Vermillion (7) Max-Planc-Institute f\"ur Physik M\"unchen Germany (8) Joint Institute for Nuclear Research Dubna (9) Triangle Universities Nuclear Laboratory Durham NC (10) Department of Physics Duke University (11) Department of Physics University of North Carolina Chapel Hill (12) Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley CA (13) South Dakota School of Mines Technology Rapid City SD (14) Los Alamos National Laboratory Los Alamos NM (15) Department of Physics University of Tennessee Knoxville (16) Research Center for Nuclear Physics Osaka University Ibaraki Osaka Japan (17) Department of Physics Princeton University Princeton NJ (18) Department of Physics North Carolina State University Raleigh (19) Department of Physics Massachusetts Institute of Technology Cambridge MA (20) Department of Physics Black Hills State University Spearfish (21) Physics Department Tennessee Tech University Cookeville (22) Department of Physics Engineering Queen's University Kingston ON Canada (23) Physik Department Technische Universit\"at Germany)

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classification ⚛️ nucl-ex physics.ins-det

keywords majoranadecaydemonstratordetectorsbetacollaborationdatadouble-beta

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The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q$_{\beta\beta}$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data.

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The Majorana Demonstrator Status and Preliminary Results

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