Study of 2β-decay of 100Mo and 82Se using the NEMO3 detector
R. Arnold , C. Augier , J. Baker , A. Barabash+, V. Brudanin , A. J. Caffrey , V. Egorov , J. L. Guyonnet , F. Hubert+, Ph. Hubert+, L. Jenner , C. Jollet , S. Jullian , A. Klimenko , O. Kochetov , S. Konovalov+, V. Kovalenko , D. Lalanne , F. Leccia+, I. Linck , C. Longuemare*, G. Lutter+, Ch. Marquet+, F. Mauger*, H. W. Nicholson , H. Ohsumi , F. Piquemal+, J-L. Reyss , R. Saakyan , X. Sarazin , F. Scheibling , Yu. Shitov , L. Simard , A. Smolnikov , I. Stekl , J. Suhonen°, C. S. Sutton , G. Szklarz , V. Timkin , J. Thomas , V. Tretyak , V. Umatov+, L. Vála , I. Vanyushin+, S. Vasiliev , V. Vasilyev+, V. Vorobel , Ts. Vylov
+CENBG, IN2P3-CNRS et Universitéde Bordeaux, 33170 Gradignan, France *LPC, IN2P3-CNRS et Universitéde Caen, 14032 Caen, France Joint Institute for Nuclear Research, 141980 Dubna, Russia CFR, CNRS, 91190 Gif sur Yvette, France INEEL, Idaho Falls, ID 83415, USA °JYVÄSKYLÄUniversity, 40351 Jyväskylä, Finland +Institute of Theoretical and Experimental Physics, 117218 Moscow, Russia LAL, IN2P3-CNRS et UniversitéParis-Sud, 91405 Orsay, France MHC, South Hadley, Massachusetts 01075, USA IReS, IN2P3-CNRS et UniversitéLouis Pasteur, 67037 Strasbourg, France IEAP CTU, Prague, Czech Republic Charles University, Prague, Czech Republic SAGA University, Saga, Saga 840-8502, Japan 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
(T1/2 > 3.1• 1023 y , 90% CL) and 82Se (T1/2 > 1.4• 1023 y , 90% CL) have been obtained. The corresponding limits
on the effective majorana neutrino mass are: eV and eV, respectively.
Also the limits on double-beta decay with Majoron emission are: T1/2 > 1.4• 1022 y (90%CL) for 100Mo and T1/2> 1.2• 1022
y (90% CL) for 82Se.
Corresponding bounds on the Majoron-neutrino
coupling constant are
and < (0.7-1.6) • 10-4 . Two-neutrino 2β-decay half-lives
have been measured with a high accuracy, y and
y.
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