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Proton Orbital[541]1/2 and backbending in ^(178)W

Communications in Theoretical Physics 2008年第9期50卷 715-718页

作者： WEI Zhi-Yuan LIU Shu-Xin School of Physics Peking University Beijing 100871 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Collisions Lanzhou 730000 China

The microscopic mechanism of nine experimentally observed bands in ^178W is investigated using the particle-number conserving method of the cranked shell model with monopole and quadrupole paring interactions. The experimental results, including the moments of inertia and angular momentum alignments of nine bands in ^178W, are reproduced well by the particle-number conserving calculations, in which no free parameter is involved. Calculations demonstrate that occurrence of sharp backbending comes mainly from the contribution of high-j intruder orbitals vi13/2 or πh11/2 and their interference effect with orbitals near the Fermi surface. Theω variation of the occupation probability of each cranked orbital and the contribution to moment of inertia from each cranked orbital are analyzed.

关键词： backbending cranked shell model moment of inertia pairing interaction

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backbendings of superdeformed bands in ^(36,40)Ar

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Chinese Physics C 2018年第5期42卷 85-90页

作者：向旭辉贺晓涛 College of Material Science and Technology Nanjing University of Aeronautics and Astronautics

Experimentally observed superdeformed(SD) rotational bands in36Ar and40Ar are studied by the cranked shell model(CSM) with the pairing correlations treated by a particle-number-conserving(PNC) *** is the first time that PNC-CSM calculations have been performed on the light nuclear mass region around A=*** 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 in36Ar is attributed to the sharp rise of the simultaneous alignments of the neutron and proton 1 d5/2[202]5/2 pairs and 1 f7/2[321]3/2 pairs, which is a consequence of the band crossing between the 1 d5/2[202]5/2 and 1 f7/2[321]3/2 configuration states. The gentle upbending at low frequency of the SD band in40Ar is mainly affected by the alignments of the neutron 1 f7/2[321]3/2 pairs and proton 1 d5/2[202]5/2 *** 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.

关键词： superdeformed band backbending moment of inertia cranked shell model

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Robustness of pair structures for nuclear yrast states

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Chinese Physics C 2023年第6期47卷 99-107页

作者：潘一飞程奕源路毅姜慧周先荣赵玉民 Department of Physics East China Normal UniversityShanghai 200241China College of Physics and Engineering Qufu Normal UniversityQufu 273165China School of Science Shanghai Maritime UniversityShanghai 201306China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

In this study,we investigate the robustness of pair structures for nuclear yrast states,that is,whether the structures of relevant collective pairs as building blocks of different yrast states are the *** focus on deformed and transitional nuclei and study the yrast states of^(28)Si,^(50)Cr,and^(132)Xe,whose experimental R_(4/2)values are 2.60,2.40,and 2.16,respectively,using the nucleon-pair approximation(NPA)and shell-model effective *** each yrast state,we consider optimized pair structures to be those providing the energy minimum for this *** find the minimum,many full NPA calculations are performed with varying pair structures,and the numerical optimization procedure of the conjugate gradient method is *** results suggest that optimized pair structures remain the same for all states within a rotational band of a deformed *** results also suggest that after backbending,that is,changing of the intrinsic state,the structure of the S pair,which is essential to build the monopole pairing correlation,remains approximately unchanged,whereas the structures of the non-S pairs,which are essential to build the quadrupole correlation,change significantly.

关键词： nucleon-pair approximation robustness of optimized pair structures yrast states backbending

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Comparative Phenomenological Description of Even-Even Isotopes at Mass Region A ≈ 70

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Journal of Applied Mathematics and Physics 2016年第3期4卷 511-518页

作者： Samir U. El-Kameesy Hesham Shahbunder Karima E. Abdelmageed Heba Elwany Department of Physics Faculty of Science Ain Shams University Cairo Egypt Department of Physics Collage of Sciences and Humanities Sattam Bin Abdulaziz University Kharj Saudi Arabia Department of Physics Faculty of Science Benha University Benha Egypt

In the present work the nuclear structure properties and the backbending phenomena of even-even isotopes at A ≈ 70 mass region are analyzed using two simultaneous theoretical models based on a simple modified version of the collective model predictions besides an improved version of exponential model with the inclusion of pairing correlation. In general, both models successfully describe the backbending phenomena in that region. From the comparison between the predictions of the two proposed models a firm conclusion is obtained concerning the superiority of the simple improved version of the exponential model in describing the forward and down-bending region of the φ-ω2 plots.

关键词： Energy Levels Moment of Inertia Yrast Bands backbending Cr Ge Se and Kr Even Mass Isotopes Collective Model Exponential Model

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Collective Rotational Bands in Transfermium Nuclei

Collective Rotational Bands in Transfermium Nuclei

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第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： Xiao-tao He~(1 1)) Zhong-zhou Ren~2 Shu-xin Liu~3 En-guang Zhao~4 Jin-yan Zeng~3 1(College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China) 2(Department of Physics,Nanjing University,Nanjing 210093,China) 3(School of Physics,Peking University,Beijing 100871,China) 4(Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100080,China)

Rotational bands in even-even nuclei Fm,No,No and odd-A nuclei No, Md are studied by the cranked shell model with particle-number conserving treatment for monopole and quadrupole pairing *** bands are reproduced very well by theoretical results.A backbending of kinematic moment of inertia（?） is predicted at（?）≈0.275,0.300 MeV,0.275 MeV in bands of No,No and No,*** detailed information about the contribution to alignment from each cranked single particle level exhibits that the backbendings in No,No are mainly due to the rapidly aligned angular momentum of proton 1j[770]1/2 pairs and neutron 2h[761]3/2,1j[734]9/2 pairs the band crossing,and that in No is attributed to the simultaneous alignment of neutron 2h（1/2[761]） and proton 1j（1/2[770]） *** one signature band was observed in *** predict its signature partner band with a sharp backbending at very low frequency of（?）w≈0.15 *** of（?） in Md are the consequence of crossing between the proton 1/2[521]and 1/2[770]*** sudden rise of（?） is mainly due to the large alignment of proton 1/2[770]pair.

关键词： High-j intruder orbital Transfermium nuclei backbending Cranked shell model Moment of inertia

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