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New stage of search for 2K(2ν) capture of 78Kr |
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| Authors: | Ju M Gavriljuk A M Gangapshev V N Gavrin V V Kazalov V V Kuzminov N Ya Osetrova S I Panasenko I I Pul’nikov S S Ratkevich A V Ryabukhin A N Shubin G V Skorynin |
| Institution: | (1) Baksan Neutrino Observatory, Institute for Nuclear Research, Russian Academy of Sciences, Russia;(2) Kharkiv National University, Kharkiv, Ukraine;(3) FSUE PA Electrochemical Plant, Krasnoyarsk krai, Russia |
| Abstract: | A technique to search for 2K capture of 78Kr with a large low-background proportional counter filled with a sample of krypton enriched in 78Kr up to 99.8% at a pressure of 4.51 atm is described in this paper. The results of first measurements are presented. An analysis of data collected for 159 h yielded a new limit to the half-life of 78Kr with regard to 2K capture (T 1/2 ≥ 1.5 × 1021 yr (90% C.L.)). The sensitivity of the facility to the process for one year of measurement was evaluated to be S = 1.0 × 1022 yr (90% C.L.). The text was submitted by the authors in English. |
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