Search for 2K(2ν)-capture of Kr-78

2011/12/05 by Ju. M. Gavriljuk, A. M. Gangapshev, Gavriljuk, Ju. M. +13
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #Radioactive Decay and Measurement Techniques #nucl-ex

paper · pdf · doi:10.48550/arxiv.1112.0861

Proceedings for the XV-th International School "Particles and Cosmology", May 26 - June 2, 2011 Troitsk, Moscow Region, Russian Federation. 4 pages, 5 figures

arxiv created 2011/12/05 · openalex publication_date 2011/12/05 · arxiv updated 2011/12/06 · openalex created_date 2022/09/01 · openalex updated_date 2026/07/28

Abstract

Results of a search for Kr-78 double K-capture at the second stage of the experiment with high-pressure copper proportional counters are presented. The method is based on comparison of spectra measured with natural and enriched krypton. The total exposure of the low background measurements is for Kr-78 152 g*yr and for Kr-nat 106 g*yr. An excess of events was observed in the analysis of Kr-78 selected data collected during 2008-2010 years. This excess could correspond to a double K-capture of Kr-78 with the half-life of T_1/2(2K,2ν+ 0ν)=[1.4^+2.2_-0.7]⋅ 10²² yr (90% C.L.)

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