Lifetime measurements and particle-core coupling calculations in 144Sm

Applying the generalized centroid shift method in the 142Nd(α,2n)144Sm reaction the following half-lives have been measured:T1/2(3,376 keV)=(1.6±0.2) ns, T1/2(3,460 keV)=(0.5±0.2) ns and T1/2(5,150 keV)≤0.3 ns. Level energies and electromagnetic transition rates have been calculated within a particle-core coupling approach that is based on the shell model with configuration mixing. The persistence of l-forbiddenness of M1 transitions between rather complex configurations could be confirmed. (orig.)