HIGH-SPIN ISOMER IR194M2 PRODUCED BY TRIPLE NEUTRON CAPTURE

A 171-day high-spin (I>~10) isomer was discovered in Ir194. It is predominantly formed by three successive neutron captures from Ir191, via successively higher spin states in Ir192 (I=4) and Ir193m (I=112). The isomer decays by γ decay chiefly to a 2438-keV state in Pt194, which is depopulated by two parallel branches. The more intense branch proceeds through a ground-state band" (8+→6+→4+→2+→0+) whose level energies indicate that Pt194 is a somewhat deformed and very "soft" nucleus. © 1968 The American Physical Society."