A new investigation of half-lives for the decay modes of ${}^{50}$V

Abstract

A new search for the decay modes of the 4-fold forbidden non-unique decay of ${}^{50}$V has been performed at the Gran Sasso Underground Laboratory (LNGS). In total an exposure of 197 kg $\times$ d has been accumulated. The half-life for the electron capture into the first excited state of ${}^{50}$Ti has been measured with the highest precision to date as $2.67_{-0.18}^{+0.16}\times 10^{17}$ yr (68% C.I.) in which systematics uncertainties dominate. The search for the $\beta$-decay into the first excited state of ${}^{50}$Cr resulted in a lower limit of $1.9\times 10^{19}$ yr (90% C.I.), which is an improvement of almost one order of magnitude compared to existing results. The sensitivity of the new measurement is now in the region of theoretical predictions.

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• Development of cryogenic calorimeters to measure the spectral shape of In-115 beta decay