Testing the IBM plus broken pairs model at high spin: An experimental viewpoint

摘要

Extensive measurements and calculations have been made on neutron deficient A = 80--90 nuclei. The measurements focused on extracting electromagnetic matrix elements between states of angular momentum J > 12h, which provided stringent tests of the IBM plus broken pairs model in the four quasi-particle regime. Starting from a detailed analysis of (sup 86)Zr, the model was extended to both isotones and isotopes in the region. The model is especially powerful for interpreting transitional nuclei where the competition between vibrational and single particle degrees of freedom determine the structure of states and their decays. It appears entirely appropriate for analysis of the new features revealed by the ''third generation'' gamma arrays.