Abstract
New sub-μs isomers have been observed in the neutron-rich Sn isotopes. 125,127,129Sn nuclei have been produced in a relativistic fission reaction of U238 on a Be9 target at 750 A·MeV and by the fragmentation of Xe136 at 600 A·MeV populating high-spin yrast states. In addition to the already known μs isomers, three new ones with sub-μs half-lives have been observed. These yrast isomers are the high-spin members of the ν(d3/2−1h11/2−2) and νh11/2−n, seniority v=3 multiplets leading to isomeric (23/2+) and (27/2−) states, respectively. Added to the already known 19/2+μs isomers in this region the current work completes the systematic information of neutron-hole excitations toward the filling of the last h11/2 orbital at N=82. The results are discussed in the framework of state-of-the-art shell-model calculations using realistic interactions.4 MoreReceived 27 March 2008DOI:https://doi.org/10.1103/PhysRevC.77.064313©2008 American Physical Society
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