Pocketful of tin isomers from heavy-ion collisions

摘要

Reaction products of (sup 122,124)Sn + (sup 76)Ge((sup 8O)Se) collisions 10--15% above the barrier have been studied by (gamma)-ray spectroscopy, and new yrast isomers in (sup 119--124)Sn isotopes have been identified and characterized. B(E2) values determined for ((nu)h(sub 11/2))(sup n) 10(sup +) (yields) 8(sup +) transitions in even-A Sn nuclei pinpoint half-filling of the (nu)h(sub 11/2) subshell close to N = 73. In odd-A Sn isotopes, 19/2(sup +) isomers with 1--10 (mu)s half-lives occur systematically, and higher-lying ((nu)h(sub ll/2))(sup n)v=3 27 /2(sup (minus)) isomers in (sup 119)Sn and (sup 121)Sn have also been identified. These deep inelastic excitation processes were found to populate a large number of neutron-rich nuclei strongly enough for yrast spectroscopy studies.