CONFIGURATION AND SPIN ASSIGNMENTS OF YRAST BAND FOR DOUBLY ODD NUCLEUS CS-122

Energy spectrum of yrast band for Cs-122 is studied by using particle- rotor model (PRM) of odd-odd nuclei, in Which special attention is pai d to the model basis accounting for the effect of the instability gamm a vibration perturbation around axial symmetry. In order to check the assignments of this band, two calculation schemes are put into practic e. The first one is for previous pi h(11/2) X nu g(7/2) configuration with bandhead spin I-o = (6(-)) which was obtained from cranked shell model (CSM) calculation, and the other one is for pi h(11/2) X nu h(11 /2) configuration with I-o = (9(+)) supported by the systematic analys es of experimental data. A qualitative comparison between the present PRM calculation and that of GSM has also been made. The results indica te that, rather than pi h(11/2) X nu g(7/2) with I-o = (6(-)), pi h(11 /2) X nu h(11/2) With I-o = (9(+)) is it more reasonable assignment to the yrast band in Cs-122.