Search for ββ decay in 136Xe:: new results from the Gotthard experiment

被引：142

作者：

Luescher, R

Farine, J

Boehm, F

Busto, J

Gabathuler, K

Gervasio, G

Henrikson, HE

Jorgens, V

Lou, K

Paic, A

Schenker, D

Tadsen, A

Treichel, M

Vuilleumier, JL

Vuilleumier, JM

Wong, H

机构：

[1] Inst Phys, CH-2000 Neuchatel, Switzerland

[2] CALTECH, Norman Bridge Lab Phys, Pasadena, CA 91125 USA

[3] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

PHYSICS LETTERS B | 1998年 / 434卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(98)00906-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Gotthard Xe experiment has taken an additional 6013 hours of data with an upgraded readout system. Lower limits for the half-life of the double beta decay in Xe-136 are T-1/2(0 nu) > 4.4 x 1023 yr, (including 6830 hours taken in an earlier phase), T-1/2(0 nu chi 0) > 0.72 x 10(22) yr and T-1/2(2 nu) > 3.6 x 10(20) yr at 90% confidence level. Alpha spectroscopy, as well as beta alpha and alpha alpha coincidence techniques lead to a determination of the activity of the gas of 10(-12) g/g effective of Th-232 and U-238. Evaluations of background strongly suggest that an appreciable fraction of the beta beta-candidates comes from the allowed 2 nu decay. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：407 / 414

页数：8

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