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采用处理含有对力的推转壳模型的粒子数字恒方法研究了A-190区奇奇核194TI中6条超形变带,计算结果与实验符合得非常好,根据我们的PNC计算结果,分别指定了194TI的6条超形变带的组态,详细分析了质子和中子的堵塞效应对转动惯形的影响,转动惯量随转动频率的变化主要来源于高N闯入壳(对中子N=7,对质子N=6)的贡献,而其他大壳对转动惯量的贡献基本上不随转动频率变化。 相似文献
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If is there enhanced sensitivity to variations of fine structure constant, nucleon mass and meson masses in the transition between the low energy and long-lived nuclear isomer and ground states? To answer this open problem, we investigate the transition between the long-lived 7.6±0.5 eV isomer and ground states in 229Th based on the formulae derived from both the Nilsson model and Feynman-Hellmann theorem. Consistent conclusions are drawn by these two method. The sensitivity to relative variation of fine structure constant could be enhanced by 3—4 orders of magnitude, and to variations of nucleon mass and meson masses are enhanced by about 5—6 orders of magnitude in the 229Th transition. 相似文献
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The microscopic mechanism of the identical bands in odd-odd nucleus ^194Tl and its neighbour odd-A nucleus ^193Tl are investigated using the particle-number conserving method with monopole and quadrupole pairing interaction. It is found that the blocking effect plays an important role in the variation of moments of inertia (J^(1) and J^(2)) with rotational frequency for the superdeformed bands and identical bands. The alignment of 194T1 bands with respect to the ^193Tl(1) band used as a reference is also discussed. 相似文献
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The multi-particle states and rotational properties of the two-particle bands in 254No are investigated by the cranked shell model with pairing correlations treated by the particle number conserving method.The rotational bands on top of the two-particle K^π=3^+,8^− and 10^+ states and the pairing reduction are studied theoretically in 254No for the first time.The experimental excitation energies and moments of inertia of the multi-particle states are reproduced well by the calculations.Better agreement with the data is achieved by including the high-order deformation ε6,which leads to enlarged Z=100 and N=152 deformed shell gaps.An increase of J1 in these two-particle bands compared with the ground state band is attributed to the pairing reduction due to the Pauli blocking effect. 相似文献
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Experimentally observed superdeformed(SD) rotational bands in ~(36)Ar and ~(40)Ar are studied by the cranked shell model(CSM) with the pairing correlations treated by a particle-number-conserving(PNC) method.This is the first time that PNC-CSM calculations have been performed on the light nuclear mass region around A=40.The experimental kinematic moments of inertia J~((1))versus rotational frequency are reproduced well. The backbending of the SD band at frequency around ω =1.5 Me V in ~(36)Ar is attributed to the sharp rise of the simultaneous alignments of the neutron and proton 1 d_(5/2)[202]5/2 pairs and 1 f_(7/2)[321]3/2 pairs, which is a consequence of the band crossing between the 1 d_(5/2)[202]5/2 and 1 f_(7/2)[321]3/2 configuration states. The gentle upbending at low frequency of the SD band in ~(40)Ar is mainly affected by the alignments of the neutron 1 f_(7/2)[321]3/2 pairs and proton 1 d_(5/2)[202]5/2 pairs.The PNC-CSM calculations show that besides the diagonal parts, the off-diagonal parts of the alignments play an important role in the rotational behavior of the SD bands. 相似文献
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The newly observed isomer and ground-state band in the odd-Z neutron-rich rare-earth nucleus 163 Eu are investigated by using the cranked shell model(CSM), with pairing treated by the particle-number conserving(PNC)method. This is the first time detailed theoretical investigations are performed of the observed 964(1) keV isomer and ground-state rotational band in ~(163) Eu. The experimental data are reproduced very well by the theoretical results. The configuration of the 964(1) keV isomer is assigned as the three-particle state 13~-/2(v7~+/2 [633]v1~-/2[521]π5~+/2[413]).More low-lying multi-particle states are predicted in ~(163) Eu. Due to its significant effect on the nuclear mean field, the high-order ε6 deformation plays an important role in the energy and configuration assignment of the multi-particle states. Compared to its neighboring even-even nuclei ~(162) Sm and ~(164) Gd,there is a 10%~15% increase of J~((1)) of the oneparticle ground-state band in ~(163) Eu. This is explained by the pairing reduction due to the blocking of the nucleon on the proton π5~+/2 [413] orbital in ~(163) Eu. 相似文献
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