Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 1, 1993 | public
Journal Article Open

Search for neutrinoless double-beta decay in 136-Xe with a time projection chamber


A xenon time projection chamber (TPC) with an active volume of 180 liters has been built to study neutrinoless double-beta decay in Xe-136. The experiment was performed in the Gotthard Underground Laboratory, with 5 atm of xenon enriched to 62.5% in Xe-136. The experimental details, background considerations, detector performance, and data analysis are discussed. From 6830 h of data, no evidence has been found for the 0nu 0+-->0+ transition. Half-life limits of T1/2(0nu) > 3.4(6.4) X 10^(23) yr in the mass mechanism mode, and T1/2(0nu) > 2.6(4.9) X 10^23 yr in the right-handed currents mode, at the 90(68)% C.L., were derived, corresponding to an upper limit on the Majorana neutrino mass parameter [m(nu)] of about 2.8 eV. Limits on two-neutrino double-beta decay of T1/2(2nu) /2 > 2. 1 X 10^(20) yr, and on neutrinoless double-beta decay with Majoron emission of T1/2(0nuchi) > 4.9 X 10^(21) yr, both at 90% C.L., were also derived. Accordingly, a limit on the effective Majoron-neutrino coupling parameter of [g(M)] < 2.4 X 10^(-4) was deduced.

Additional Information

©1993 The American Physical Society. Received 8 March 1993. The authors would like to thank Petr Vogel for numerous stimulating discussions, as well as technical staff of the Institut de Physique of Neuchatel and of the Paul Scherrer Institute for assistance. This work was supported by the U.S. Department of Energy and the Fonds National Suisse pour la Recherde Scientifique.


Files (1.9 MB)
Name Size Download all
1.9 MB Preview Download

Additional details

August 22, 2023
October 13, 2023