/ Experiment-HEP hep-ex/0507083


First results of the search of neutrinoless double beta decay with the NEMO 3 detector


Arnold, R. ; Augier, C. ; Baker, J. ; Barabash, A. ; Broudin, G. ; Brudanin, V. ; Caffrey, A.J. ; Caurier, E. ; Egorov, V. ; Errahmane, K. ; Etienvre, A.I. ; Guyonnet, J.L. ; Hubert, F. ; Hubert, Ph. ; Jollet, C. ; Jullian, S. ; Kochetov, O. ; Kovalenko, V. ; Konovalov, S. ; Lalanne, D. ; Leccia, F. ; Longuemare, C. ; Lutter, G. ; Marquet, Ch. ; Mauger, F. ; Nowacki, F. ; Ohsumi, H. ; Piquemal, F. ; Reyss, J.L. ; Saakyan, R. ; Sarazin, X. ; Simard, L. ; Simkovic, F. ; Shitov, Yu. ; Smolnikov, A. ; Stekl, I. ; Suhonen, J. ; Sutton, C.S. ; Szklarz, G. ; Thomas, J. ; Timkin, V. ; Tretyak, V. ; Umatov, V. ; Vala, L. ; Vanushin, I. ; Vasilyev, V. ; Vorobel, V. ; Vylov, Ts.

Published in: Phys.Rev.Lett.
Year: 2005
Vol.: 95
Page No: 182302
Pages: 5

Abstract: The NEMO 3 detector, which has been operating in the Frejus underground laboratory since February 2003, is devoted to the search for neutrinoless double beta decay (bb0nu). Half-lives of the two neutrino double beta decays (bb2nu) have been measured for 100Mo and 82Se. After 389 effective days of data collection from February 2003 until September 2004 (Phase I), no evidence for neutrinoless double beta decay was found from ~7kg of 100Mo and ~1 kg of 82Se. The corresponding lower limits for the half-lives are 4.6 x 10^23 years for 100Mo and 1.0 x10^23 years for 82Se (90% C.L.). Depending on the nuclear matrix elements calculation, limits for the effective Majorana neutrino mass are <m> < 0.7-2.8 eV for 100Mo and <m> < 1.7-4.9 eV for 82Se

Keyword(s): double beta decay ; nuclei with mass number 59 to 89 ; nuclei with mass number 90 to 149 ; radioactive decay periods ; neutrino mass

Web-Page: http://pdglive.lbl.gov/REFERENCE_info1.brl?slacrpp=PRLTA,95,182302; http://link.aps.org/abstract/PRL/V95/E182302

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