Abstract
Results from searches of double capture in Kr 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 . 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 . Corresponding to such effect, the half-life of Kr relative to capture equals y. Half-life limits for other transitions to the excited states in Se are obtained at the level of y in the first time. In particular, limits on capture to the excited level (1499 keV) and resonant neutrinoless double capture to the level (2838 keV) have been defined on the level of y at 90 C.L.
5 More- Received 6 August 2012
DOI:https://doi.org/10.1103/PhysRevC.87.035501
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