JETP Letters: issues online

VOLUME 80 (2004) | ISSUE 6 | PAGE 429

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

R. Arnold $^\blacktriangledown$ , C. Augier $^\bullet$ , J. Baker $^\triangledown$ , A. Barabash⁺, V. Brudanin $^\triangle$ , A. J. Caffrey $^\triangledown$ , V. Egorov $^\triangle$ , J. L. Guyonnet $^\blacktriangledown$ , F. Hubert⁺, Ph. Hubert⁺, L. Jenner $^\blacklozenge$ , C. Jollet $^\blacktriangledown$ , S. Jullian $^\bullet$ , A. Klimenko $^\triangle$ , O. Kochetov $^\triangle$ , S. Konovalov⁺, V. Kovalenko $^\triangle$ , D. Lalanne $^\bullet$ , F. Leccia⁺, I. Linck $^\blacktriangledown$ , C. Longuemare^*, G. Lutter⁺, Ch. Marquet⁺, F. Mauger^*, H. W. Nicholson $^\blacktriangle$ , H. Ohsumi $^\lozenge$ , F. Piquemal⁺, J-L. Reyss $^\square$ , R. Saakyan $^\blacklozenge$ , X. Sarazin $^\bullet$ , F. Scheibling $^\blacktriangledown$ , Yu. Shitov $^\triangle$ , L. Simard $^\bullet$ , A. Smolnikov $^\triangle$ , I. Stekl $^\blacksquare$ , J. Suhonen^°, C. S. Sutton $^\blacktriangle$ , G. Szklarz $^\bullet$ , V. Timkin $^\triangle$ , J. Thomas $^\blacklozenge$ , V. Tretyak $^\triangle$ , V. Umatov⁺, L. Vála $^\blacksquare$ , I. Vanyushin⁺, S. Vasiliev $^\triangle$ , V. Vasilyev⁺, V. Vorobel $^\bigstar$ , Ts. Vylov $^\triangle$
⁺CENBG, IN2P3-CNRS et Universitéde Bordeaux, 33170 Gradignan, France
^*LPC, IN2P3-CNRS et Universitéde Caen, 14032 Caen, France
$^\triangle$ Joint Institute for Nuclear Research, 141980 Dubna, Russia
$^\square$ CFR, CNRS, 91190 Gif sur Yvette, France
$^\triangledown$ INEEL, Idaho Falls, ID 83415, USA
^°JYVÄSKYLÄUniversity, 40351 Jyväskylä, Finland
⁺Institute of Theoretical and Experimental Physics, 117218 Moscow, Russia
$^\bullet$ LAL, IN2P3-CNRS et UniversitéParis-Sud, 91405 Orsay, France
$^\blacktriangle$ MHC, South Hadley, Massachusetts 01075, USA
$^\blacktriangledown$ IReS, IN2P3-CNRS et UniversitéLouis Pasteur, 67037 Strasbourg, France
$^\blacksquare$ IEAP CTU, Prague, Czech Republic
$^\bigstar$ Charles University, Prague, Czech Republic
$^\lozenge$ SAGA University, Saga, Saga 840-8502, Japan
$^\blacklozenge$ University College London, London, UK

PACS: 14.80.Mz, 23.40.-s

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• 10²³ y , 90% CL) and ⁸²Se (T_1/2 > 1.4• 10²³ y , 90% CL) have been obtained. The corresponding limits on the effective majorana neutrino mass are: $\langle m_{\nu}\rangle< (0.8-1.2)$ eV and $\langle m_{\nu}\rangle< (1.5-3.1)$ eV, respectively. Also the limits on double-beta decay with Majoron emission are: T_1/2 > 1.4• 10²² y (90%CL) for ¹⁰⁰Mo and T_1/2> 1.2• 10²² y (90% CL) for ⁸²Se. Corresponding bounds on the Majoron-neutrino coupling constant are $\langle g_{ee}\rangle < (0.5-0.9) \cdot 10^{-4}$ and < (0.7-1.6) • 10^-4 . Two-neutrino 2β-decay half-lives have been measured with a high accuracy, $T_{1/2}^{^{100}{\rm Mo}} = [7.68 \pm 0.02({\rm stat}) \pm 0.54({\rm syst}) ] \cdot 10^{18}$ y and $T_{1/2}^{^{82}{\rm Se}} = [10.3 \pm 0.3({\rm stat}) \pm 0.7({\rm syst}) ]\cdot 10^{19}$ y.

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