First observation of excited states in the neutron deficient N = 86 isotones 159Ta and 160W
The γ decays of excited states in the neutron deficient nuclei 159 Ta and 160 W have been identified for the first time. The nuclei of interest were produced in reactions induced by beams of 58 Ni ions at energies of 286 MeV, 291 MeV, and 298 MeV bombarding a 106 Cd target. Prompt γ rays were recorded using the JUROSPHERE spectrometer and were tagged through the subsequent α decays of associated recoil ions measured in a position-sensitive silicon strip detector at the focal plane of the gas-filled separator RITU. Level schemes have been deduced and compared with similar structures observed in neighboring nuclei. peerReviewed
Oblately deformed isomeric proton-emitting state in 151Lu
Gamma rays from excited states feeding a proton-emitting isomeric-state in 151Lu have been observed for the first time. Comparison with state-of-the-art nonadiabatic quasiparticle calculations indicates an oblately deformed, 3/2+ proton-emitting state with a quadrupole deformation of β2 = −0.11. The calculations suggest an increase in quadrupole deformation, to β2 = −0.18, with increasing spin which is understood in terms of the mixing of Nilsson states at the Fermi surface. It is also shown that the proton decay half-life is consistent with that from a 3/2+ state with a quadrupole deformation of β2 = −0.12. peerReviewed