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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). Intotal an exposure of 197 kg $\times$ d has been accumulated. The half-life forthe electron capture into the first excited state of $^{50}$Ti has beenmeasured with the highest precision to date as $2.67_{-0.18}^{+0.16} \times10^{17}$ yr (68% C.I.) in which systematics uncertainties dominate. The searchfor the $\beta$-decay into the first excited state of $^{50}$Cr resulted in alower limit of ${1.9} \times 10^{19}$ yr (90% C.I.), which is an improvement ofalmost one order of magnitude compared to existing results. The sensitivity ofthe new measurement is now in the region of theoretical predictions.

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