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20 April 2024

» arxiv » 1507.2200

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A search for double-electron capture in 74Se using coincidence/anticoincidence gamma-ray spectrometry
M. Jeskovsky ; D. Frekers ; A. Kovacik ; P. P. Povinec ; P. Puppe ; J. Stanicek ; I. Sykora ; F. Simkovic ; J.H. Thies ;
Date:	8 Jul 2015
Abstract:	Evaluation of single, coincidence and anticoincidence gamma-ray spectrometry methods has been carried out with the aim to search for double-electron capture in 74Se. This process is unique, because there is probability for transition to the 2+ excited state in 74Ge (1204 keV), and de-excitation through two gamma-quanta cascade with energies of 595.9 keV and 608.4 keV. Long-term measurements with anticosmic shielded HPGe spectrometer and the coincidence HPGe-NaI(Tl) spectrometer did not show any evidence for the double-electron capture in 74Se. The best limit for the half-life of the double electron capture in 74Se (both for the neutrinoless and two neutrino processes) was estimated to be >1.5x10E19 years.
Source:	arXiv, 1507.2200
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