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arXiv · hep-ex/0609058

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
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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.).

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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. 2006-09-29. Measurement of double beta decay of 100Mo to excited states in the NEMO 3 experiment. https://doi.org/10.1016/j.nuclphysa.2006.09.021

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