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On the Difference of High Spin Band Structure Between I and Ce Isotopes
Authors:ZHANG Ji-Ye
Affiliation: Institute of Modern Physics,Academia Sinica of China,Lanzhou 730000
Abstract:It has been predicted that in nuclei with Z=52-56,there are many low-lying oblate and prolate rotational bands.Experimental investigation has been carrying out for the high spin band structure in serial I and Ce isotopes recently.It is found along with the prolate bands,there do exist oblate bands for proton h11/2,g7/2 and d5/2,configurations in I.The band termination (non-collective oblate shape) was found in 119,121I as well.All the prolate band structure was found in Ce.Further theoretical calculation was done with newly fitted Nilsson κ and μ parameters.Results show that the absolute values of shell energy and self-consistent pairing energy for oblate shape are always lager for I than for Ce.Besides,the band head oblateprolate energy difference is much in favor of oblate shape for I than for Ce.All these results are related to the existence of an oblate 54 gap in proton single particle diagram.
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