Fine structure in the α decay of U219

The heaviest $N$ = 127 even-odd isotone $^{219}\mathrm{U}$ was produced in a fusion evaporation reaction employing $^{40}\mathrm{Ar}$ ions bombarding $^{183}\mathrm{W}$ target. Fusion evaporation residues were separated in flight by the gas-filled recoil separator Spectrometer for Heavy Atoms and Nuclear Structure and subsequently identified using a recoil-$\ensuremath{\alpha}$ correlation method. The $\ensuremath{\alpha}$-decay properties of $^{219}\mathrm{U}$ were measured with improved precision, and two new $\ensuremath{\alpha}$-decay lines were observed and assigned as the decays from the ground state of $^{219}\mathrm{U}$ to the ($5/{2}^{\ensuremath{-}}$) and ($3/{2}^{\ensuremath{-}}$) states of $^{215}\mathrm{Th}$, respectively. The systematics for the $\ensuremath{\alpha}$ decay of the $N$ = 127 even-odd isotones as well as the low-lying nuclear structure of their $N$ = 125 daughter nuclei are discussed.