[en] Further the retinal 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 are always larger for iodine isotopes than for cesium isotopes. Besides, the band head oblate prolate energy difference of h_11/2, g_7/2 and d_5/2 configurations is all negative (favorite to oblate shape) for iodine isotopes but mostly positive (favorite prolate shape for cesium isotopes)

[en] The empirical proton-neutron interaction of the ground states and high spin states in yrast bands for even-even systems has been recently extracted and analysed quite extensively. The globule characteristics and spin dependence of the average p-n interaction between the last proton and last neutron, δV_pn could be revealed through such analysis. However, in order to investigate the configuration dependence of such kind of empirical p-n interactions one has to deal with odd-A system

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[en] The ground state potential energy surface for nucleus ¹⁹⁰Hg was calculated in terms of Nilsson-Strutinsky method with standard κ, μ set and modified one. It is shown that there is a low-lying second minimum in prolate side except the known oblate minimum. The existence of such a prolate minimum, which is different from total routhian surface calculation, may explain the recent observation of extra deformation band in ¹⁹⁰Hg

[en] 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_9/2, g_7/2 and 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 k 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 oblate prolate 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

[en] A method for extracting the empirical proton-neutron interaction energy between the last proton and the last neutron, θV_pn has been described and developed. The results for ground states of all even-even nuclei with N not less than 40 and for high spin states of some nuclei have been discussed. θV_pn values at high frequency for given configuration of some odd A nuclei were shown as well. It is found that these empirical θV_pn values include all multipole (mostly the momopole and quadrupole) terms of proton-neutron interaction and sensitively depend on nuclear deformation, configuration and rotational frequency

[en] The observation of multi-band structure in nucleus ¹⁸⁵Pt reported recently, once again raises the open question about whether the alignment of proton h_9/2 pair or neutron i_13/2 pair should be responsible to the backbending in five bands. Blocking experiments prefer the proton h_9/2 pair while Total Rothian Surface calculation supports neutron i_13/2 pair. Based on the analysis of assumptions implied in both approaches, a new theoretical calculation which includes the dynamic effect of band crossing is presented. Such a calculation indicates that the alignment of proton h_9/2 pari should be the main cause for the observed backbendings