New limit on neutrinoless double β decay in ^(136)Xe with a time projection chamber

Creators: Wong, H. T.; Boehm, F.; Fisher, P.; Gabathuler, K.; Henrikson, H. E.; Imel, D. A.; Iqbal, M. Z.; Jörgens, V.; Mitchell, L. W.; O'Callaghan-Hay, B. M.; Thomas, J.; Treichel, M.; Vuilleumier, J.-C.; Vuilleumier, J.-L.

Abstract

A xenon time projection chamber with an active volume of 207 L has been built to study neutrinoless double β decay in ^(136)Xe. Data were taken in the Gotthard Underground Laboratory, with 5 atm of xenon enriched to 62.5% in ^(136)Xe. From 3380 h of data, no evidence has been found for the 0ν 0^(+)→0^(+) transition. Half-life limits of T_(1/2)^(0ν)>2.5(4.9)×10^(23) yr in the mass-mechanism mode and T_(1/2)^(0ν)>1.7(3.2)×10^(23) yr in the right-handed-current mode, at the 90(68)% C.L., were derived. An upper limit for the Majorana neutrino mass parameter was deduced.

Additional Information

© 1991 American Physical Society. Received 5 August 1991; published in the issue dated 2 September 1991. The authors would like to thank Petr Vogel for many contributions and discussions, Val Telegdi for stimulating comments, and J.-P. Bourquin, C. Heche, D. Schenker, and the technical staff from Institut de PhysiqueNeuchiitel and Paul Scherrer Institute for assistance. This work is supported by the U.S. Department of Energy and the Fonds National Suisse pour Ia Recherche Scientifique.

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