New limits on double beta decay of 136Xe

doi:10.1016/0920-5632(94)90282-8

Nuclear Physics B - Proceedings Supplements

Volume 35, May 1994, Pages 378-380

https://doi.org/10.1016/0920-5632(94)90282-8 Get rights and content

Abstract

A Xenon TPC with an active volume of 180 liters has been built to study the neutrinoless double beta decay in ¹³⁶Xe. Data were taken in the Gotthard Underground Laboratory with 5 atm of xenon enriched to 62% in ¹³⁶Xe. A total of 7647 hours of data has been taken. New limits on neutrino mass and majoron decay are presented.

References (7)

J. Suhonen et al.
Nucl. Phys.
(1991)
H. Georgi et al.
Nucl. Phys.
(1981)
E. Bellotti
Phys. Lett.
(1991)

There are more references available in the full text version of this article.

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Nuclear Physics B - Proceedings Supplements

Abstract

References (7)

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Cited by (13)

Double beta decay - Physics beyond the standard model now, and in future (GENIUS)

Sub-eV limit for the neutrino mass from <sup>76</sup>Ge double beta decay by the HEIDELBERG-MOSCOW experiment

The research of 2β decay of <sup>116</sup>Cd with enriched <sup>116</sup>CdWO<inf>4</inf> crystal scintillators

Double beta decay

Future perspectives of double beta decay and dark matter search - GENIUS

New results from Gotthard ββ experiment