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

R. Arnold, C. Augier, J. Baker, A. S. Barabash, M. Bongrand, G. Broudin, V. Brudanin, A. J. Caffrey, V. Egorov, A. I. Etienvre, N. Fatemi-Ghomi, F. Hubert, Ph. Hubert, J. Jerie, C. Jollet, S. Jullian, S. King, O. Kochetov, S. I. Konovalov, V. Kovalenko, D. Lalanne, T. Lamhamdi, F. Leccia, Y. Lemi`ere, C. Longuemare, G. Lutter, Ch. Marquet, F. Mauger, A. Nachab, H. Ohsumi, F. Perrot, F. Piquemal, J. L. Reyss, J. S. Ricol, R. Saakyan, X. Sarazin, L. Simard, F. Simkovic, Yu. Shitov, A. Smolnikov, S. S"oldner-Rembold, I. Stekl, J. Suhonen, C. S. Sutton, G. Szklarz, J. Thomas, V. Timkin, V. Tretyak, V. Umatov, L. V'ala, I. Vanyushin, V. Vasiliev, V. Vorobel, Ts. Vylov

hep-exarXiv:hep-ex/0609058

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 1020 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 1022 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 1021 y (at 90% C.L.) and for the neutrinoless mode T(0nu)1/2(0+ --> 2+1) > 1.6 x 1023 y (at 90% C.L.).

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