Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97

作者：Swan T P D^*; Walker P M; Podolyak Zs; Reed M W; Dracoulis G D; Lane G J; Kibedi T; Smith M L

来源：Physical Review C, 2012, 85(2): 024313.

DOI：10.1103/PhysRevC.85.024313

High-spin states in the Er-164(68)96 region were studied using Be-9 + Gd-160 reactions. Pulsed beam conditions were exploited for enhanced sensitivity to delayed gamma-ray transitions. New isomers were identified in Dy-161, Ho-163, Er-162, and Er-165. The Er-162 isomer is interpreted to decay by E1 transitions to the ground-state band with a reduced hindrance of f(nu) = 33. A plot of f(nu) values for all Delta K = 7, E1 transitions from two-quasiparticle isomers to the ground-state bands of even-even nuclei reveals only a small influence from the dynamic to kinematic moment-of-inertia ratio, which provides a measure of Coriolis K mixing within the ground-state band. This is interpreted to imply that the relatively low hindrances are due to K mixing in the isomer, caused by a combination of Coriolis and octupole band mixing.

• 出版日期2012-2-21