Two Quasiparticle States in the IBA Model and the High-Spin Anomaly in the Hg Isotopes

摘要

The spectra of the exp 195-199 Hg isotopes are calculated using a fermion-boson basis. The boson states are constructed within the framework of the IBA model and the single particle shell model fermion states are renormalised to correct lack of orthogonality with the boson basis. Renormalisation of a standard nuclear Hamiltonian naturally leads to fermion number mixing in the effective interaction. Good agreement is found for energy spectra, g-factors and B(E2) predictions both for low lying levels and the anomalous high-spin states. (Atomindex citation 12:626361)