On the nature of the 17 mu s isomer of the Sb-133 valence nucleus

The decay of the 17 mu s isomer of Sb-133 was re-investigated experimentall y. It was produced by thermal neutron induced fission of Pu-241. Its detect ion is based on time correlation between fission fragments selected by the LOHENGRIN spectrometer at ILL (Grenoble), and the gamma-rays, and conversio n electrons from the isomer. The interpretation of the level scheme is base d on shell model calculations, where empirical two-body matrix elements wer e employed. The good agreement between theory and experiment suggests that the isomer is the 21/2(+) member of the 2p-1h pi g(7/2)nu(f(7/2)h(11/2)(-1) ) configuration.