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

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Abstract

After analysis of 5797 h of data from the detector NEMO3, new limits on neutrinoless double beta decay of 100Mo (T 1/2>3.1×1023y, 90% CL) and 82Se (T 1/2>1.4×1023y, 90% CL) have been obtained. The corresponding limits on the effective majorana neutrino mass are: 〈m v〉<(0.8–1.2) eV and 〈m v〉<(1.5–3.1) eV, respectively. Also the limits on double-beta decay with Majoron emission are: T 1/2>1.4×1022y (90% CL) for 100Mo and T 1/2>1.2×1022y (90% CL) for 82Se. Corresponding bounds on the Majoron-neutrino coupling constant are 〈 g ee〉<(0.5–0.9)×10−4 and <(0.7−1.6)×10−4. Two-neutrino 2β-decay half-lives have been measured with a high accuracy, \(T_{1/2}^{100_{Mo} } = [7.68 \pm 0.02(stat) \pm 0.54(syst)] \times 10^{18} y\) and \(T_{1/2}^{82_{Se} } = [10.3 \pm 0.3(stat) \pm 0.7(syst)] \times 10^{19} y\).

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From Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 80, No. 6, 2004, pp. 429–433.

Original English Text Copyright © 2004 by Arnold, Augier, Baker, Barabash, Brudanin, Caffrey, Egorov, Guyonnet, F. Hubert, Ph. Hubert, Jenner, Jollet, Jullian, Klimenko, Kochetov, Konovalov, Kovalenko, Lalanne, Leccia, Linck, Longuemare, Lutter, Marquet, Mauger, Nicholson, Ohsumi, Piquemal, Reyss, Saakyan, Sarazin, Scheibling, Shitov, Simard, Smolnikov, Stekl, Suhonen, Sutton, Szklarz, Timkin, Thomas, Tretyak, Umatov, Vala, Vanyushin, Vasiliev, Vasilyev, Vorobel, Vylov.

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Arnold, R., Augier, C., Baker, J. et al. Study of 2β-decay of 100Mo and 82Se using the NEMO3 detector. Jetp Lett. 80, 377–381 (2004). https://doi.org/10.1134/1.1830651

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