/ Experiment-HEP hep-ex/0609058


Measurement of double beta decay of Mo-100 to excited states in the NEMO 3 experiment


Arnold, R. ; Augier, C. ; Baker, J. ; Barabash, A.S. ; Bongrand, M. ; Broudin, G. ; Brudanin, V. ; Caffrey, A.J. ; Egorov, V. ; Etienvre, A.I. ; Fatemi-Ghomi, N. ; Hubert, F. ; Hubert, Ph. ; Jerie, J. ; Jollet, C. ; Jullian, S. ; King, S. ; Kochetov, O. ; Konovalov, S.I. ; Kovalenko, V. ; Lalanne, D. ; Lamhamdi, T. ; Leccia, F. ; Lemiere, Y. ; Longuemare, C. ; Lutter, G. ; Marquet, Ch. ; Mauger, F. ; Nachab, A. ; Ohsumi, H. ; Perrot, F. ; Piquemal, F. ; Reyss, J.L. ; Ricol, J.S. ; Saakyan, R. ; Sarazin, X. ; Simard, L. ; Simkovic, F. ; Shitov, Yu. ; Smolnikov, A. ; Soldner-Rembold, S. ; Stekl, I. ; Suhonen, J. ; Sutton, C.S. ; Szklarz, G. ; Thomas, J. ; Timkin, V. ; Tretyak, V. ; Umatov, V. ; Vala, L. ; Vanyushin, I. ; Vasiliev, V. ; Vorobel, V. ; Vylov, Ts.

Published in: Nucl.Phys.
Year: 2007
Vol.: A781
Page No: 209-226
Pages: 23

Abstract: The double beta decay of 100Mo to the 0^+_1 and 2^+_1 excited states of 100Ru is studied using the NEMO 3 data. After the analysis of 8024 h of data the half-life for the two-neutrino double beta decay of 100Mo to the excited 0^+_1 state is measured to be T^(2nu)_1/2 = [5.7^{+1.3}_{-0.9}(stat)+/-0.8(syst)]x 10^20 y. The signal-to-background ratio is equal to 3. Information about energy and angular distributions of emitted electrons is also obtained. No evidence for neutrinoless double beta decay to the excited 0^+_1 state has been found. The corresponding half-life limit is T^(0nu)_1/2(0^+ --> 0^+_1) > 8.9 x 10^22 y (at 90% C.L.). The search for the double beta decay to the 2^+_1 excited state has allowed the determination of limits on the half-life for the two neutrino mode T^(2nu)_1/2(0^+ --> 2^+_1) > 1.1 x 10^21 y (at 90% C.L.) and for the neutrinoless mode T^(0nu)_1/2(0^+ --> 2^+_1) > 1.6 x 10^23 y (at 90% C.L.).

Keyword(s): Double beta decay ; Neutrino ; (100)Mo ; Excited state

Web-Page: http://pdglive.lbl.gov/REFERENCE_info1.brl?slacrpp=NUPHA,A781,209

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