Spectroscopy of 161Hf from low to high spin
PHYSICAL REVIEW C(2014)
摘要
Excited states in the neutron-deficient nucleus Hf-161(72)89 have been populated using the Sn-118(Ti-48, 5n)Hf-161 and Pd-110(Fe-56, 5n)Hf-161 fusion-evaporation reactions at 240 and 270 MeV, respectively. The level scheme for Hf-161 has been extended with the observation of new band structures and an I-pi = (13/2(+)) isomeric state with a half-life of 4.8(2) mu s has been identified. The decay path from this isomer to the (7/2(-)) ground state is established. The yrast band, based on the (13/2(+)) isomeric state, is extended up to (73/2(+)) and side band structures are identified up to (69/2(-)) and (55/2(-)). Quasiparticle assignments for these rotational structures are made on the basis of their alignment properties and Woods-Saxon cranked shell-model calculations.
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