New investigation of half-lives for the decay modes of V50

A new search for the decay modes of the fourfold forbidden nonunique decay of $^{50}\mathrm{V}$ has been performed at the Gran Sasso Underground Laboratory (LNGS). In total, an exposure of 197 kg d has been accumulated. The half-life for the electron capture into the first excited state of $^{50}\mathrm{Ti}$ has been measured with the highest precision to date as $2.{67}_{\ensuremath{-}0.18}^{+0.16}\ifmmode\times\else\texttimes\fi{}{10}^{17}$ yr (68% C.I.) in which systematics uncertainties dominate. The search for the $\ensuremath{\beta}$ decay into the first excited state of $^{50}\mathrm{Cr}$ resulted in a lower limit of $1.9\ifmmode\times\else\texttimes\fi{}{10}^{19}$ 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.