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Title:
Indications of 2ν2K capture in 78Kr
Authors:
Gavrilyuk, Yu. M.; Gangapshev, A. M.; Kazalov, V. V.; Kuzminov, V. V.; Panasenko, S. I.; Ratkevich, S. S.
Affiliation:
AA(Baksan Neutrino Observatory INR RAS, Russia), AB(Baksan Neutrino Observatory INR RAS, Russia), AC(Baksan Neutrino Observatory INR RAS, Russia), AD(Baksan Neutrino Observatory INR RAS, Russia), AE(V. N. Karazin Kharkiv National University, Kharkiv, Ukraine), AF(V. N. Karazin Kharkiv National University, Kharkiv, Ukraine)
Publication:
Physical Review C, vol. 87, Issue 3, id. 035501 (PhRvC Homepage)
Publication Date:
03/2013
Origin:
APS
PACS Keywords:
Beta decay, double beta decay, electron and muon capture, 59<, =A<, =89, Neutrino mass and mixing, Lifetimes
DOI:
10.1103/PhysRevC.87.035501
Bibliographic Code:
2013PhRvC..87c5501G

Abstract

Results from searches of double K capture in 78Kr in an experiment with the large-volume copper proportional counter, using data samples corresponding of two independent series of measurements with different intrinsic radioactivity background are presented. The total exposure of the low-background measurements is 0.343 kg×y. A combination of methods of selection of useful events with a unique set of characteristics and wavelet analysis of events allowed a reduction of the background by ˜2000 times in the energy region of interest. The statistical significance of combined data from two stages of operation equals 2.5σ. Corresponding to such effect, the half-life of 78Kr relative to 2ν2K capture equals T1/2=[9.2-2.6+5.5(stat)±1.3(syst)]×1021 y. Half-life limits for other 2K transitions to the excited states in 78Se are obtained at the level of 1021 y in the first time. In particular, limits on 2ν2K capture to the excited level 01+ (1499 keV) and resonant neutrinoless double K capture to the level 2+ (2838 keV) have been defined on the level of T1/2≥5.4×1021 y at 90% C.L.
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