Search for $\alpha$ decay of ${}^{151}$Eu to the first excited level of ${}^{147}$Pm using underground $\gamma$-ray spectrometry

F. A. Danevich, E. Andreotti, M. Hult +3

The alpha decay of ${}^{151}$Eu to the first excited level of ${}^{147}$Pm ($J^{\pi }=5/2^{+}$, $E_{exc}=91.1$ keV) was searched for at the HADES underground laboratory ($\approx 500$ m w.e.…