Neutron-rich In and Cd isotopes close to the doubly magic 132Sn -: art. no. 054318

Microsecond isomers in the In and Cd isotopes, in the mass range A = 123 to 130, were investigated at the ILL reactor, Grenoble, using the LOHENGRIN mass spectrometer, through thermal-neutron induced fission reactions of Pu targets. The level schemes of the odd-mass In123-129 and new measurements of the mus half-lives of the odd-odd In126-130 are reported. However, the expected 8(+) isomers in the even-mass Cd isotopes were not observed. The comparisons between the experimental B(M2) strengths for In and Sn isotopes are discussed. A shell-model study of the heaviest In and Cd nuclei was performed using a realistic interaction derived from the CD-Bonn nucleon-nucleon potential. The calculation predicts values of the half-lives of the first 8(+) states in Cd-126,Cd-128 of similar to10 ns, which could explain the nonobservation of mus isomers. Comparison shows that the calculated levels of In-130 and In-129 are in good agreement with the experimental values while some discrepancies occur for the lighter In isotopes. The collectivity of Cd-126,Cd-128 is discussed in the framework of the shell model and in comparison with Hg-204.