Lifetime measurement for the 15/2-1 and 13/2-1 levels in 129Sn

Abstract

Lifetimes of the 15/2-1 and 13/2-1 levels in 129Sn have been measured using gamma -gamma fast timing technique which come out to be 10(3) ps and 6(4) ps, respectively. The excited states were populated through internal transition decay of higher lying mu s isomers in 129Sn produced as fission fragments and mass separated by the Lohengrin separator at Institut Laue-Langevin. The generalized centroid difference method was applied with four LaBr3(Ce) detectors, placed at the focal plane of the separator. The measured lifetimes and absolute transition probabilities are discussed in the light of large scale shell model calculations to interpret the single particle configurations and their mixing.