Nature of Excited States of Gadolinium Isotopes

Harun Resit Yazar ； Ümit Erdem

《Chinese Journal of Physics》 46卷3期 (2008/06) Pp. 270-277

並列摘要

Recent observations of a large number of 0(superscript +) states in the heavy deformed regions opened a new window and emphasized the importance of microscopic approach to atomic nucleus. A large number of results of a (p, t) experiment revealed 13 excited 0(superscript +) states below~3.2 MeV in 158Gd [4]. Such data provide a challenge to theory. In this work, excited K=0(superscript +) states in the 158Gd isotope are studied by using the interacting boson models sd-IBM and df-IBM. The Sd-IBA and df-IBA models can be related to each other, and the states of the IBA-1 model can be identified with the fully symmetric states in the sdf-IBA model. It is the purpose of this work to study this relation and apply it to Gadolinium isotopes. We show that the interacting boson approximation may account for many of these 0(superscript +) states. It was found that the calculated energy spectra of the Gadolinium isotopes agrees quite well with the experimental data. The observed B (E2) values were also calculated and compared with the experimental data.