Microsecond yrast isomers were observed in the 125,127,129 Sn isotopes. These nuclei are produced by thermal neutron induced fission of 233 U and 239 Pu. The detection is based on time correlation between fission fragments selected by the LOHENGRIN spectrometer at ILL ͑Grenoble͒ and the ␥ rays or conversion electrons from isomers. In this paper, the decay schemes of the new 19/2 ϩ yrast isomers in 125,127,129 Sn are reported. The measured low-lying negative parity states are compared with the results of various calculations. This work suggests also the presence of high spin ␤ isomers in 127,129 In.

No abstract

No abstract