Lifetimes of low-lying states in {sup 125,127}La measured by the recoil distance method

Lifetimes of low-lying states in {sup 125,127}La nuclei were measured using the recoil distance method. The nuclei were produced by the {sup 94}Mo({sup 35}Cl,2p2n) and {sup 112}Cd({sup 19}F,4n) reactions, respectively. Experimental results were described in the framework of the core quasiparticle coupling model. It was found that the observed bands can be reasonably well described as {pi}g{sub 7/2}, {pi}g{sub 9/2}, and {pi}h{sub 11/2} quasiparticle configurations coupled to elongated ({beta}{sub 2}{approx}0.28) triaxial cores. No evidence for a rapid change of the nuclear shape in the {pi}h{sub 11/2} band in {sup 127}La is seen in our data. {copyright} {ital 1997} {ital The American Physical Society}