Population of yrast states in 191Os using deep-inelastic reactions

G A Jones, Zs Podolyák, P M Walker, P H Regan, G de Angelis, M Axiotis, D Bazzacco, P G Bizzeti, F Brandolini, R Broda, D Bucurescu, E Farnea (+16 others)
2005 Journal of Physics G: Nuclear and Particle Physics  
Several nuclei in the A ∼ 190 region have been studied following deep-inelastic reactions using a 460 MeV 82 Se projectile impinging upon a thick 192 Os target. The GASP array (at the Legnaro National Laboratory in Italy) was used to measure the resulting γ -decays. The previously reported near-yrast structure of 191 Os is extended to a t 1 2 = 61 ns isomer, at an energy of 2640 keV. Branching ratios for I = 1 and I = 2 transitions in the K π = 11 2 + band have been measured, giving |(g K − g R
more » ... giving |(g K − g R )/Q 0 | = 0.022(3) and 0.024(7) for transitions from the 17 2 + and 19 2 + states respectively. These are consistent with the theoretical calculation for the proposed ν11/2 + [615] configuration of the band. Nilsson plus BCS calculations reveal that the isomer is likely to have a {ν11/2 + [615] ⊗ π 11/2 − [505] ⊗ π 9/2 − [514]} configuration with J π = K π = 31 2 + . This yields an implied reduced hindrance of f ν = 1.9, in accordance with empirical systematics of K isomers in the A ∼ 180-190 region.
doi:10.1088/0954-3899/31/10/095 fatcat:2pjr65vchfaafps2d5fkv5ks3y