Results of In-Depth Analysis of Data Obtained in the Experimental Search for 2K(2ν)-Capture in {sup 78}Kr

• Published in: Physics of particles and nuclei 2018-07, Vol.49 (4)
• Main Authors: Gavrilyuk, Yu. M., Gangapshev, A. M., Kazalov, V. V., Kuzminov, V. V., Panasenko, S. I., Ratkevich, S. S., Tekueva, D. A., Yakimenko, S. P.
• Format: Article
• Language: English
• Subjects: DATA ANALYSIS; ELECTRON CAPTURE; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; K CAPTURE; K SHELL; KRYPTON 78; KRYPTON 81; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 1063-7796; 1531-8559
• DOI: 10.1134/S1063779618040238

A brief description of the results of joint analysis of data obtained in long-term measurements of krypton samples differing in {sup 78}Kr content is presented. Low-background high-pressure proportional gas counters were used as detectors. The comparative analysis of experimental data on single and double K -capture provided the first estimate of the probability of production of a double K -shell vacancy in the process of K -shell electron capture in {sup 81}Kr: P{sub KK}=[5.7±0.8 (stat.)±0.4 (syst.)]×10{sup −5}. A new result for the half-life of {sup 78}Kr with respect to the 2K(2ν)-mode was also obtained: T{sub 1/2}=[1.9{sub −0.7}{sup +1.3} (stat.)±0.3 (syst.)]×10{sup 22} years (90% CL).