/ nucl-ex arXiv:1710.11608

Search for Zero-Neutrino Double Beta Decay in $^{76}$Ge with the Majorana Demonstrator

Aalseth, C.E. (PNL, Richland) ; Abgrall, N. (LBNL, NSD) ; Aguayo, E. (UC, Berkeley) ; Alvis, S.I. (UC, Berkeley) ; Amman, M. (CENPA, Seattle) ; Arnquist, I.J. (LBNL, NSD) ; Avignone, F.T., III (PNL, Richland) ; Back, H.O. (ORNL, Oak Ridge (main)) ; Barabash, A.S. (ORNL, Oak Ridge (main)) ; Barbeau, P.S. (Moscow, ITEP) ; Barton, C.J. (Moscow, ITEP) ; Barton, P.J. (South Dakota U.) ; Bertrand, F.E. (LBNL, NSD) ; Bode, T. (ORNL, Oak Ridge (main)) ; Bos, B. (Munich, Max Planck Inst.) ; Boswell, M. (South Dakota Sch. Mines Tech.) ; Brodzinski, R.L. (TUNL, Durham) ; Bradley, A.W. (TUNL, Durham) ; Brudanin, V. (TUNL, Durham) ; Busch, M. (Dubna, JINR) ; Buuck, M. (TUNL, Durham) ; Caldwell, A.S. (CENPA, Seattle) ; Caldwell, T.S. (South Dakota Sch. Mines Tech.) ; Chan, Y-D. (TUNL, Durham) ; Christofferson, C.D. (LBNL, NSD) ; Chu, P.-H. (South Dakota Sch. Mines Tech.) ; Collar, J.I. (Los Alamos) ; Combs, D.C. (Chicago U.) ; Cooper, R.J. (TUNL, Durham) ; Cuesta, C. (TUNL, Durham) ; Detwiler, J.A. (TUNL, Durham) ; Doe, P.J. (LBNL, NSD) ; Dunmore, J.A. (CENPA, Seattle) ; Efremenko, Yu. (CENPA, Seattle) ; Ejiri, H. (Tennessee U.) ; Elliott, S.R. (Osaka U., Res. Ctr. Nucl. Phys.) ; Fast, J.E. (Los Alamos) ; Finnerty, P. (PNL, Richland) ; Fraenkle, F.M. (PNL, Richland) ; Fu, Z. (PNL, Richland) ; Fujikawa, B.K. (PNL, Richland) ; Fuller, E. (LBNL, NSD) ; Galindo-Uribarri, A. (PNL, Richland) ; Gehman, V.M. (ORNL, Oak Ridge (main)) ; Gilliss, T. (Los Alamos) ; Giovanetti, G.K. (TUNL, Durham) ; Goett, J. (TUNL, Durham) ; Green, M.P. (Los Alamos) ; Gruszko, J. (North Carolina U.) ; Guinn, I.S. (North Carolina U.) ; Guiseppe, V.E. (CENPA, Seattle) ; Hallin, A.L. (Los Alamos) ; Haufe, C.R. (Alberta U.) ; Hehn, L. (TUNL, Durham) ; Henning, R. (LBNL, NSD) ; Hoppe, E.W. (TUNL, Durham) ; Hossbach, T.W. (PNL, Richland) ; Howe, M.A. (PNL, Richland) ; Jasinski, B.R. (TUNL, Durham) ; Johnson, R.A. (South Dakota U.) ; Keeter, K.J. (CENPA, Seattle) ; Kephart, J.D. (Black Hills State U.) ; Kidd, M.F. (PNL, Richland) ; Knecht, A. (TUNL, Durham) ; Konovalov, S.I. (TUNL, Durham) ; Kouzes, R.T. (Moscow, ITEP) ; Lesko, K.T. (PNL, Richland) ; LaFerriere, B.D. (PNL, Richland) ; Leon, J. (PNL, Richland) ; Leviner, L.E. (CENPA, Seattle) ; Loach, J.C. (TUNL, Durham) ; Lopez, A.M. (LBNL, NSD) ; Luke, P.N. (Tennessee U.) ; MacMullin, J. (LBNL, NSD) ; MacMullin, S. (TUNL, Durham) ; Marino, M.G. (TUNL, Durham) ; Martin, R.D. (TUNL, Durham) ; Massarczyk, R. (LBNL, NSD) ; McDonald, A.B. (Los Alamos) ; Mei, D.-M. (Queen's U., Kingston) ; Meijer, S.J. (Los Alamos) ; Merriman, J.H. (TUNL, Durham) ; Mertens, S. (PNL, Richland) ; Miley, H.S. (LBNL, NSD) ; Miller, M.L. (PNL, Richland) ; Myslik, J. (CENPA, Seattle) ; Orrell, J.L. (LBNL, NSD) ; O'Shaughnessy, C. (PNL, Richland) ; Othman, G. (PNL, Richland) ; Overman, N.R. (TUNL, Durham) ; Pettus, W. (PNL, Richland) ; Phillips, D.G., II (CENPA, Seattle) ; Poon, A.W.P. (TUNL, Durham) ; Perumpilly, G. (LBNL, NSD) ; Pushkin, K. (South Dakota U.) ; Radford, D.C. (South Dakota U.) ; Rager, J. (ORNL, Oak Ridge (main)) ; Reeves, J.H. (TUNL, Durham) ; Reine, A.L. (TUNL, Durham) ; Rielage, K. (TUNL, Durham) ; Robertson, R.G.H. (Los Alamos) ; Ronquest, M.C. (CENPA, Seattle) ; Ruof, N.W. (Los Alamos) ; Schubert, A.G. (CENPA, Seattle) ; Shanks, B. (CENPA, Seattle) ; Shirchenko, M. (TUNL, Durham) ; Snavely, K.J. (Dubna, JINR) ; Snyder, N. (TUNL, Durham) ; Steele, D. (South Dakota U.) ; Suriano, A.M. (Los Alamos) ; Tedeschi, D. (South Dakota Sch. Mines Tech.) ; Tornow, W. (South Carolina U.) ; Trimble, J.E. (TUNL, Durham) ; Varner, R.L. (TUNL, Durham) ; Vasilyev, S. (ORNL, Oak Ridge (main)) ; Vetter, K. (Tennessee U.) ; Vorren, K. (Tennessee U.) ; White, B.R. (TUNL, Durham) ; Wilkerson, J.F. (ORNL, Oak Ridge (main)) ; Wiseman, C. (ORNL, Oak Ridge (main)) ; Xu, W. (South Carolina U.) ; Yakushev, E. (TUNL, Durham) ; Yaver, H. (Dubna, JINR) ; Young, A.R. (LBNL, NSD) ; Yu, C.-H. (TUNL, Durham) ; Yumatov, V. (ORNL, Oak Ridge (main)) ; Zhitnikov, I. (Moscow, ITEP) ; Zhu, B.X. (Dubna, JINR) ; Zimmermann, S. (Los Alamos)

Pages: 7

Abstract: The \MJ\ Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The \MJ\ \DEM\ comprises 44.1~kg of Ge detectors (29.7 kg enriched in $^{76}$Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at \qval\ and a very low background with no observed candidate events in 10 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of $1.9\times10^{25}$ yr (90\% CL). This result constrains the effective Majorana neutrino mass to below 240 to 520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is $4.0_{-2.5}^{+3.1}$ counts/(FWHM t yr).

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