Two-quasiparticle and rotation-aligned structures in 190Pt, 192Pt and 194Pt

摘要: Abstract The γ-decay of high-spin levels in 190, 192, 194 Pt is observed when Os targets are bombarded with α-particles energies between 23 and 51 MeV. Energies, intensities, angular distributions, lifetimes isomeric levels, as well coincidence relations yield conversion electrons measured. In this way, up to spin 18, 20 12 established 190 Pt, 192 respectively. the separation 10 + members ground band very small B (E2) value transition determined be 50 s.p.u. These observations interpreted a crossing phenomenon within rotation-alignment model. Explicit calculations such model give fair reproduction experimental if nucleus has oblate deformation alignment i 13 2 neutrons assumed. both nucleides additional even odd spins positive parity come close energy band. Such also predicted by calculations. 8 remarkably corresponding believed smaller than single-particle estimate. This discontinuity may associated change two-proton-quasiparticle excitation. addition band, negative-parity “band” ranging from 5 strongly populated all three isotopes. A qualitative explanation terms generalized particle-rotor discussed. Finally, − isomer structure built on Pt.