/ Experiment-HEP hep-ex/0410021


Study of 2b-decay of Mo-100 and Se-82 using the NEMO3 detector


Arnold, R. ; Augier, C. ; Baker, J. ; Barabash, A. ; Brudanin, V. ; Caffrey, A.J. ; Egorov, V. ; Guyonnet, J.L. ; Hubert, F. ; Hubert, Ph. ; Jenner, L. ; Jollet, C. ; Jullian, S. ; Klimenko, A. ; Kochetov, O. ; Konovalov, S. ; Kovalenko, V. ; Lalanne, D. ; Leccia, F. ; Linck, I. ; Longuemare, C. ; Lutter, G. ; Marquet, Ch. ; Mauger, F. ; Nicholson, H.W. ; Ohsumi, H. ; Piquemal, F. ; Reyss, J.-L. ; Saakyan, R. ; Sarazin, X. ; Scheibling, F. ; Shitov, Yu. ; Simard, L. ; Smolnikov, A. ; Stekl, I. ; Suhonen, J. ; Sutton, C.S. ; Szklarz, G. ; Timkin, V. ; Thomas, J. ; Tretyak, V. ; Umatov, V. ; Vala, L. ; Vanyushin, I. ; Vasiliev, S. ; Vasilyev, V. ; Vorobel, V. ; Vylov, Ts.

Published in: JETP Lett. / Pisma Zh.Eksp.Teor.Fiz.
Year: 2004 / 2004
Vol.: 80 / 80
Page No: 377-381 / 429-433
Pages: 5

Abstract: After analysis of 5797 h of data from the detector NEMO3, new limits on neutrinoless double beta decay of Mo-100 (T_{1/2} > 3.1 10^{23} y, 90% CL) and Se-82 (T_{1/2} > 1.4 10^{23} y, 90% CL) have been obtained. The corresponding limits on the effective majorana neutrino mass are: m < (0.8-1.2) eV and m < (1.5-3.1) eV, respectively. Also the limits on double-beta decay with Majoron emission are: T_{1/2} > 1.4 10^{22} y (90% CL) for Mo-100 and T_{1/2}> 1.2 10^{22} y (90%CL) for Se-82. Corresponding bounds on the Majoron-neutrino coupling constant are g < (0.5-0.9) 10^{-4} and < (0.7-1.6) 10^{-4}. Two-neutrino 2b-decay half-lives have been measured with a high accuracy, T_{1/2} Mo-100 = [7.68 +- 0.02(stat) +- 0.54(syst) ] 10^{18} y and T_{1/2} Se-82 = [10.3 +- 0.3(stat) +- 0.7(syst) ] 10^{19} y.

Keyword(s): nuclei with mass number 90 to 149 ; nuclei with mass number 59 to 89 ; double beta decay ; neutrino mass ; neutrinos ; nuclear forces ; radioactive decay periods ; elementary particle coupling constants ; Goldstone bosons

Web-Page: http://link.aip.org/link/?jtp/80/377; http://pdglive.lbl.gov/REFERENCE_info1.brl?slacrpp=JTPLA,80,377

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