Decoupling behavior in {sup 132}La

Heavy-ion fusion reactions {sup 122}Sn({sup 14,15}N, xn){sup 132}La have been utilized for the lifetime measurements using the recoil distance method. The lifetimes of seven low-lying excited states were obtained. In addition, the lifetimes of two states belonging to a band, which was identified as a decoupled band, were obtained. The decoupling behavior in {sup 132}La has been theoretically investigated using the particle-rotor model in the model space of {pi}h{sub 11/2} and ({nu}s{sub 1/2}, {nu}d{sub 3/2}). The pseudospin coupling model was also utilized to understand the decoupling behavior in terms of the valence-particle configuration {pi}h{sub 11/2}({Omega}{sub {pi}}=(1/2)) x {nu}[411-tilde]({Omega}{sub {nu}}=(1/2),(3/2)), and a reasonable agreement with the experiment was obtained.