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Impact of initial fluctuations and nuclear deformations in isobar collisions

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nuclear Science and Techniques 2024年第6期35卷 155-162页

作者： Jian-Fei Wang Hao-Jie Xu Fu-Qiang Wang Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Science Huzhou UniversityHuzhou 313000China Strong-Coupling Physics International Research Laboratory(SPiRL) Huzhou UniversityHuzhou 313000China Department of Physics and Astronomy Purdue UniversityWest LafayetteIN 47907USA

Relativistic isobar^(96)_(44)Ru+^(96)_(44)Ru and^(96)_(40)Zr+^(96)_(40)Zrcollisions have revealed intricate differences in their nuclear size and shape,inspiring unconventional studies of nuclear structure using relativistic heavy ion *** this study,we investigate the relative differences in the mean multiplicityR_()and the secondR_(ε2)and third-order eccentricityR_(ε3)between isobar collisions using initial state Glauber *** is found that initial fluctuations and nuclear deformations have negligible effects on R_()in most central collisions,while both are important for the R_(ε2)and R_(ε3),the degree of which is sensitive to the underlying nucleonic or sub-nucleonic degree of *** features,compared to real data,may probe the particle production mechanism and the physics underlying nuclear structure.

关键词： Relativistic isobar collisions Initial fluctuations nuclear deformation

deformation dependence of symmetry energy coefficients of nuclei

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Science China(Physics,Mechanics & Astronomy) 2015年第8期58卷 33-38页

作者： MO QiuHong LIU Min CHENG LiChun WANG Ning Department of Physics Guangxi Normal University School of Material Science and Engineering Guilin University of Electronic Technology

Based on the semi-classical Thomas-Fermi approximation together with the Skyrme energy-density functional, we study the deformation dependence of symmetry energy coefficients of finite nuclei. The symmetry energy coefficients of nuclei with mass number A = 40, 100, 150, 208 are extracted from two-parameter parabola fitting to the calculated energy per particle. We find that the symmetry energy coefficients decrease with the increase of nuclear quadrupole deformations, which is mainly due to the isospin dependence of the difference between the proton and neutron surface diffuseness. Large deformations of nuclei can cause the change of the symmetry energy coefficient by about 0.5 Me V and the influence of nuclear deformations on the symmetry energy coefficients is more evident for light and intermediate nuclei.

关键词： symmetry energy Skyrme energy-density functional nuclear deformation Thomas-Fermi

Shell evolution at N=20 in the constrained relativistic mean field approach

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Chinese Physics C 2008年第11期32卷 882-885页

作者：孙保华李剑 School of Physics and State Key Laboratory of nuclear Physics and Technology Peking University

The shell evolution at N = 20, a disappearing neutron magic number observed experimentally in very neutron-rich nuclides, is investigated in the constrained relativistic mean field （RMF） theory. The trend of the shell closure observed experimentally towards the neutron drip-line can be reproduced. The predicted two-neutron separation energies, neutron shell gap energies and deformation parameters of ground states are shown as well. These results are compared with the recent Hartree-Fock-Bogliubov （HFB-14） model and the available experimental data. The perspective towards a better understanding of the shell evolution is discussed.

关键词： shell quenching N = 20 relativistic mean field theory nuclear deformation

High-K multi-particle bands and pairing reduction in 254No

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Chinese Physics C 2020年第3期44卷 111-118页

作者： Xiao-Tao He Shu-Yong Zhao Zhen-Hua Zhang Zhong-Zhou Ren College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China School of Physics Science and Engineering Tongji UniversityShanghai 200092China

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 Kπ= 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,J（1） in these two-particle bands compared with the ground state band is attributed to the pairing reduction due to the Pauli blocking effect.

关键词： rotational band spin assignment band-crossing high-j orbital transfermium nuclei nuclear deformation

Transfer learning and neural networks in predicting quadrupole deformation

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Chinese Physics C 2024年第6期48卷 162-168页

作者：原林李佳星张鸿飞 School of Science Xi'an Polytechnic UniversityXi'an 710048China Engineering Research Center of Flexible Radiation Protection Technology Universities of Shaanxi ProvinceXi'an 710048China Xi'an Key Laboratory of nuclear Protection Textile Equipment Technology Xi'an 710048China School of Physics Xi'an Jiaotong UniversityXi'an 710049China School of nuclear Science and Technology Lanzhou UniversityLanzhou 730000China

Accurately determining the quadrupole deformation parameters of atomic nuclei is crucial for understanding their structural and dynamic *** study introduces an innovative approach that combines transfer learning techniques with neural networks to predict the quadrupole deformation parameters of even-even *** the application of this innovative technique,the quadrupole deformation parameters of 2331 even-even nuclei are successfully predicted within the nuclear region defined by proton numbers 8≤Z≤134 and neutron numbers N≥***,we discuss the impact of nuclear quadrupole deformation parameters on the capture cross-sections in heavy-ion fusion reactions,reconstructing the capture cross-sections for the reactions ^(48)Ca+^(244)Pu and ^(48)Ca+^(248)*** research offers new insights into the application of neural networks in nuclear physics and highlights the potential of merging advanced machine learning techniques with both theoretical and experimental data,particularly in fields where experimental data are limited.

关键词： nuclear deformation neural networks transfer learning heavy-ion fusion reactions

Driving potential and fission-fragment charge distributions

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Communications in Theoretical Physics 2022年第9期74卷 92-97页

作者： Yuan Su Min Liu Ning Wang Department of Physics Guangxi Normal UniversityGuilin 541004China Guangxi Key Laboratory of nuclear Physics and Technology Guilin 541004China

We propose an efficient approach to describe the fission-fragment charge yields for actinides based on the driving potential of the fissioning *** the properties of primary fission fragments at their ground states,the driving potential,which represents the potential energies of the system around scission configuration and closely relates to the yields of fragments,can be unambiguously and quickly obtained from the Skyrme energy-density functional together with the Weizs?cker-Skyrme mass *** fission-fragment charge distributions for thermal-neutron-induced fission and spontaneous fission of a series of actinides,especially the odd-even staggering in the charge distributions,can be well *** dynamical deformations and pairing corrections of fragments play an important role in the charge distributions.

关键词： nuclear fission fragment charge distribution driving potential nuclear deformation energy density functional

Octupole deformations of Even-Even Rn, Th, and U Nuclei in Relativistic Mean Field Theory

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Communications in Theoretical Physics 2010年第6期53卷 1145-1148页

作者：王楠孟杰赵恩广 College of Physics Shenzhen University School of Physics Beijing University Center of Theoretical nuclear Physics National Laboratory of Heavy ion Accelerator Institute of Theoretical Physics Chinese Academy of Sciences

The octupole deformations and other ground state properties of even-even Rn, Th and U isotopes are investigated systematically within the framework of the reflection asymmetric relativistic mean field （RAS-RMF） model. The calculation results reproduce the binding energies and the quadrupole deformations well. The calculation results indicate these nuclei at ground states evolve from neaxly-spherical （N = 130） shape to quadrupole deformation shape with the increase of the neutron number. It is also found that among the Rn isotopes, only^222,224 Rn axe oetupole deformed and the octupole deformations for them are small. However, more nuclei （N ≌ 134 148） in Th and U isotopes are octupole deformed and the octupole deformations for some of them are significant （｜β3｜- 0.1 or even larger）.

关键词： binding energy nuclear deformation relativistic mean field theory

Projected Shell Model Description for the Proton Emitters

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原子核物理评论 2016年第2期33卷 190-196页

作者：卞宝安 School of Science Jiangnan University

Proton radioactivity is an important decay mode for nuclei near the proton drip-line. Studies of this decay mode can reveal valuable information on exotic nuclear structure and provide important information on the stucture of nuclei in extreme conditions. The new experimental data can let us understand the interactions in exotic systems, which motivate further theoretical development. The most recent application of the projected shell model(PSM) for proton emitters is represented. We study the rotational bands of the deformed proton emitter141 Ho by using the PSM. The experimental data are well reproduced. Strongly suppressed γ transition from the low-lying I~π= 3/2+state makes this state isomeric. Variations in the dynamical moment of inertia are discussed due to band crossings using the band diagram. The calculated results for proton emitter ^(151)Lu shows it is oblately deformed.

关键词： proton emitter nuclear deformation rotational band decay half-life