Chinese Physics C > 1993, Vol. 17 > Issue(8): 734-738

On the Difference of High Spin Band Structure Between I and Ce Isotopes

ZHANG Ji-Ye^,

Institute of Modern Physics,Academia Sinica of China,Lanzhou 730000

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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 h _11/2,g _7/2and d _5/2,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.

References

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Y. Liang, R. Ma, E. S. Paul et al.，Phys Rev. Lett.，64(1990),29.[2]Y. Liang, D. B. Fossan, J. R. Hughes et al.，Proc. of conf. `High Spin and Gamma-soft Nuclei", Pitts burgh, 1990, p308.[3]Y. Liang, D. B. Fossan, J. R. Hughes et al Phys. Rev.，C44(1991),R578.[4]Zhang Jingye, N. Xu, D. B. Fossan et al.，Phys. Rev.，C39(1989),714.[5]N. Xu, Zhang Jingye, D. B. Fossan et al.，Phys. Rev.，C42(1990),1394.[6]J. R. Hughes，D. B. Fossan, D. R. LaFosse et al.，Phys. Rev.，C44(1991).[7]J. R. Hughes, D. B. Fossan, D. R.LaFosse et al.，"Spectroscopy of 123Cs,Configuration Dependent Crossing Frequencies", Submit to Phys. Rev.C.[8]I. Ragnarsson, in "Future Direction in Studies of Nuclei far from Stability", Edited by J. Hamilton et al.(North-Holland )1980, p. 367.

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ZHANG Ji-Ye. On the Difference of High Spin Band Structure Between I and Ce Isotopes[J]. Chinese Physics C, 1993, 17(8): 734-738.

ZHANG Ji-Ye. On the Difference of High Spin Band Structure Between I and Ce Isotopes[J]. Chinese Physics C, 1993, 17(8): 734-738. shu

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Received: 1900-01-01
Revised: 1900-01-01

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

On the Difference of High Spin Band Structure Between I and Ce Isotopes

ZHANG Ji-Ye^,

Corresponding author:ZHANG Ji-Ye,

Institute of Modern Physics,Academia Sinica of China,Lanzhou 730000

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1993-08-05

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 h_11/2,g_7/2and d_5/2,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.