^(174)Hf and^(174)Yb by the Projected Shell Model with Improved 4-quasiparticle basis

The rare-earth nuclei^(174)Hf and^(174)are studied in the framework of the projected shell model.The calculations are carried out with an improved version of code which contains all types of four-quasiparticle basis in the configuration space.Both the yrast band and the multi-quasiparticle excited bands can be well reproduced.Compared with the experimental data,our calculations improve the previous resulst,especially for high spin states.This improvement suggests that the newly added configurations are important.In^(174)Yb,a new possible configuration is suggested for the observed K^(л)=14^(+)band,and the decay of the K^(л)=6^(+)isomeric state to the yrast band is discussed.