Results of experiments devoted to searches for 2K capture on 78Kr and for the double-beta decay of 136Xe with the aid of proportional counters

被引：9

作者：

Gavrilyuk, Yu. M. ^{[1
]}

Gangapshev, A. M. ^{[1
]}

Zhantudueva, Dj. A. ^{[1
]}

Kazalov, V. V. ^{[1
]}

Kuz'minov, V. V. ^{[1
]}

Panasenko, S. I. ^{[2
]}

Ratkevich, S. S. ^{[2
]}

Efendiev, K. V. ^{[2
]}

Yakimenko, S. P. ^{[2
]}

机构：

[1] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[2] Kharkov Natl Univ, UA-61022 Kharkov, Ukraine

来源：

PHYSICS OF ATOMIC NUCLEI | 2013年 / 76卷 / 09期

基金：

俄罗斯基础研究基金会;

关键词：

NUCLEAR-DATA SHEETS;

D O I：

10.1134/S1063778813090068

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A brief description of two low-background setups deployed at the Baksan Neutrino Observatory (Institute for Nuclear Research, Russian Academy of Sciences) and intended for searches for two types of double-beta decay of inert-gas isotopes-2K capture on Kr-78 and the double-beta decay of Xe-136-is given. The two setups in question have similar structures and employ identical large high-pressure copper proportional counters as detectors. Upon a treatment of data from measurements with krypton samples differing in the content of the isotope Kr-78, the spectrum for an enriched sample revealed an excess of events at a statistical-significance level of about two standard deviations (2 sigma). If one attributes this excess to 2K(2 nu) capture on Kr-78, the respective half-life is T (1/2) = 1.4 (-0.7) (+2.3) x 10(22) yr at a 90% C.L. A treatment of data from measurements with xenon samples differing in content of the isotope Xe-136 led to the appearance of an excess of events in the spectrum for an enriched sample at a statistical-significance level of about 2.2 sigma. If one assumes that this excess is due to the two-neutrino double-beta decay of Xe-136, then the respective half-life is T (1/2) = 5.8 (-1.8) (+4.7) x 10(21) yr.

引用

页码：1063 / 1071

页数：9

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