Abstract
AbstractExcited states of the semimagic nuclei 138Ba, 140Ce, 141Pr, 143Pm, 144Sm, 109Sn and 111Sn have been investigated by means of in‐beam γ‐spectroscopic methods. Levels in the vicinity of the yrast line having energies up to about 5 MeV have been identified and spin and parity could be determined for most of them. Several nanosecond and subnanosecond isomers have been found in the level schemes of the nuclei investigated. The g‐factors of three nanosecond isomers have been measured. The large amount of experimental information has been compared with the results of a comprehensive analysis of the excited states of N = 82 and Z = 50 semimagic nuclei in the framework of the shell model with configuration mixing. This reveals that the majority of the observed excited states of N = 82 isotones or Z = 50 isotopes can be understood as few‐particle excitations outside the doubly magic cores 132Sn and 100Sn, respectively.
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