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Probing nuclear Symmetry Energy with Giant Dipole Resonances in Finite Nuclei

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原子核物理评论 2009年第S1期26卷 181-184页

作者： CAO Li-gang1,3,MA Zhong-yu2,3 (1 Institute of Modern physics,Chinese Academy of Sciences,lanzhou 730000,china 2 china Institute of Atomic Energy,Beijing 102413,china 3 center of theoretical nuclear physics,national laboratory of heavy ion Research Facility in lanzhou,lanzhou 730000,china) Institute of Modern physics Chinese Academy of SciencesLanzhou 730000China center of theoretical nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China china Institute of Atomic Energy Beijing 102413China center of theoretical nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China

The relationship between the centroid energies of the isovector giant dipole resonance of finite nuclei and the symmetry energy has been studied. It is found the excitation energies of the dipole resonance in finite nuclei are correlated linearly with the symmetry energy at and below the saturation density. This linear correlation leads to the symmetry energy at the saturation density at the interval 33.0 MeV ≤ S(ρ0) ≤ 37.0 MeV,and the symmetry energy at ρ = 0.1 fm-3 at the interval 21.2-22.5 MeV. It is proposed that a precise measurement of the dipole mode in nuclei could set up an important constraint on the equation of state for nuclear matter.

关键词： symmetry energy dipole resonance Pygmy resonance

α-decay Branching Ratios to Rotational Band of heavy Even-even and Odd-A Nuclei

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原子核物理评论 2009年第S1期26卷 55-58页

作者： REN Zhong-zhou1,2,3,XU Chang2,3 (1 center of theoretical nuclear physics,national laboratory of heavy ion Research Facility in lanzhou,lanzhou 730000,china 2 Department of physics,Nanjing University,Nanjing 210008,china 3 Joint center for Particle,nuclear physics and Cosmology,Nanjing 210008,china) center of theoretical nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China Department of physics Nanjing UniversityNanjing 210008China Joint center for Particle Nuclear Physics and CosmologyNanjing 210008China Department of physics Nanjing UniversityNanjing 210008China Joint center for Particle Nuclear Physics and CosmologyNanjing 210008China

By using a simple barrier penetration approach,we predict the α-decay branching ratios to members of ground-state rotational band of heavy even-even No isotopes. We also extend our approach to calculate the α-decay branching ratios to the rotational band of heavy odd-A nuclei. The theoretical branching ratios of α-decays are found in good agreement with the available experimental data.

关键词： α-decay branching ratio heavy nuclei

Ground State Structure of Hs Super-heavy Isotopes

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原子核物理评论 2009年第S1期26卷 175-180页

作者： MA Long1,ZHOU Xiao-hong1,ZHANG Hong-fei2,GAN Zai-guo1, LI Jun-qing1,3 (1 Institute of Modern physics,Chinese Academy of Sciences,lanzhou 730000,china 2 School of nuclear Science and Technology,lanzhou University,lanzhou 730000,china 3 center of theoretical nuclear physics,national laboratory of heavy ion Research Facility in lanzhou,lanzhou 730000,china) Institute of Modern physics Chinese Academy of SciencesLanzhou 730000China School of nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Modern physics Chinese Academy of SciencesLanzhou 730000China center of theoretical nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China

The ground state properties of Hs nuclei studied in the framework of the relativistic mean field theory revealed that more stable isotopes are located on the proton abundant side of the chain. The last stable nucleus to the proton drip line is 256Hs. The most stable unknown Hs nucleus may be 268Hs. The density dependent delta interaction pairing is used to improve the BCS pairing correction,which results in more reasonable single-particle energy level distributions and nucleon occupation,and it is shown to be available to describe the properties of nuclei in the superheavy region.

关键词： superheavy nucleus nuclear structure pairing

How random are matrix elements of the nuclear shell model Hamiltonian?

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Science china(physics,Mechanics & Astronomy) 2009年第10期52卷 1477-1481页

作者： SHEN JiaJie1 & ZHAO YuMing1,2,3,4 1 Department of physics,Shanghai Jiao Tong University,Shanghai 200240,china 2 center of theoretical nuclear physics,national laboratory of heavy ion accelerator,lanzhou 730000,china 3 Nishina center,Institute of Physical Chemical Research(RIKEN),Hirosawa 2-1,Wako-shi,Saitama 351-0198,Japan 4 CCAST,World laboratory,Beijing 100080,china Department of physics Shanghai Jiao Tong University Shanghai 200240 China center of theoretical nuclear physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China Nishina center Institute of Physical Chemical Research (RIKEN) Hirosawa 2-1 Wako-shi Saitama 351-0198 Japan World laboratory CCAST Beijing 100080 China

In this paper we study the general behavior of matrix elements of the nuclear shell model *** find that nonzero off-diagonal elements exhibit a regular pattern,if one sorts the diagonal matrix elements from smaller to larger *** correlation between eigenvalues and diagonal matrix elements for the shell model Hamiltonian is more remarkable than that for random matrices with the same distribution unless the dimension is small.

关键词： nuclear shell model geometry property linear correlation randomize

Random Phase Approximation in Relativistic Approach

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原子核物理评论 2009年第S1期26卷 49-54页

作者： MA Zhong-yu1,2,YANG Ding1,TIAN Yuan1,CAO Li-gang2,3(1 china Institute of Atomic Energy,Beijing 102413,china 2 center of theoretical nuclear physics,national laboratory of heavy ion Research Facility in lanzhou,lanzhou 730000,china 3 Institute of Modern physics,Chinese Academy of Sciences,lanzhou 730000,china) china Institute of Atomic Energy Beijing 102413China center of theoretical nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China china Institute of Atomic Energy Beijing 102413China center of theoretical nuclear physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China Institute of Modern physics Chinese Academy of SciencesLanzhou 730000China

Some special issues of the random phase approximation(RPA) in the relativistic approach are reviewed. A full consistency and proper treatment of coupling to the continuum are responsible for the successful application of the RPA in the description of dynamical properties of finite nuclei. The fully consistent relativistic RPA(RRPA) requires that the relativistic mean filed (RMF) wave function of the nucleus and the RRPA correlations are calculated in a same effective Lagrangian and the consistent treatment of the Dirac sea of negative energy states. The proper treatment of the single particle continuum with scattering asymptotic conditions in the RMF and RRPA is discussed. The full continuum spectrum can be described by the single particle Green's function and the relativistic continuum RPA is established. A separable form of the paring force is introduced in the relativistic quasi-particle RPA.

关键词： fully consistent RRPA coupling to the continuum pairing correlation

The study of energy bands in nucleus ^(102)Zr

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Science china(physics,Mechanics & Astronomy) 2010年第1期53卷 106-110页

作者： DONG GuoXiang 1,2 , YU ShaoYing 1,2,3 , LIU YanXin 1 , SHEN CaiWan 1,2,4 & DONG YongSheng 1,2,5I School of Science, Huzhou Teachers College, Huzhou 313000, china 2 School of Science and Information Engineering, Zhejiang Normal University, Jinhua 321000, china 3 Institute of theoretical physics, Chinese Academy of Sciences, Beijing 100080, china 4 center of theoretical nuclear physics, national laboratory of heavy ion accelerator of lanzhou, lanzhou 730000, china 5 Department of physics, Jining Teachers College, Jining 012000, china 1. School of Science Huzhou Teachers College Huzhou 313000 China2. School of Science and Information Engineering Zhejiang Normal University Jinhua 321000 China3. Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China4. Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China5. Department of Physics Jining Teachers College Jining 012000 China

theoretical calculations of the energy bands in nucleus 102 Zr are carried out by taking the projected shell model approach, which has reproduced the experimental data. In addition, by analyzing band-head energies, corresponding configurations of yrast band, quasi-particle rotational bands and side bands, we have worked out the microscopic formation mechanism of axially symmetric deformation bands: The low-excitation deformation bands are attributed to the high-j intruder states 1g 7/2 and 1h 11/2 in the N=4, 5 shells; the quasi-particles in the orbit v5/2-[532], v3/2+[411] and v3/2+[413] in particular play an important role in the deformation of 102 Zr.

关键词： projected shell model yrast band quasi-particle rotational band side band

Probing proton halo of the exotic nucleus ^(28)S by elastic electron scattering

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Science china(physics,Mechanics & Astronomy) 2004年第1期47卷 42-51页

作者： WANG Zaijun1 & REN Zhongzhou1’2 1. Department of physics, Nanjing University, Nanjing 210008, china 2. center of theoretical nuclear physics, national laboratory of heavy-ion accelerator at lanzhou, lanzhou 730000, china Correspondence should be addressed to Ren Zhongzhou (email: zren@*** zren99@***) Received June 16, 2003 1. Department of physics Nanjing University 210008 Nanjing China 2. center of theoretical nuclear physics National Laboratory of Heavy-Ion Accelerator at Lanzhou 730000 Lanzhou China

Elastic electron scattering on the exotic light nucleus 28S is investigated in the plane wave Born approximation. The variation of the squared form factors of 28S with momentum transfer is compared with that of 32S. It is found that the behavior of the form factors near the second minimum (with a moderate momentum transfer) is sensitive to the alteration of the charge density distribution of halo protons in 28S. This indicates that elastic electron scattering can be a good probe of the structure of proton-halo nuclei.

关键词： elastic electron scattering, cross section, form factor, proton-halo nucleus.

Topological Structure of Vortex Solution in Jackiw-Pi Model

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Communications in theoretical physics 2007年第7期48卷 143-146页

作者： LI Xi-Guo LIU Zi-Yu LI Yong-Qing GAO Yuan GUO Yan-Rui XIAO Guo-Qing1 Institute of Modern physics,the Chinese Academy of Sciences,P.O.Box 31,lanzhou 730000,china2 Graduate School,the Chinese Academy of Sciences,Beijing 100049,china3 center of theoretical nuclear physics,national laboratory of heavy ion Collisions,lanzhou 730000,china Institute of Modern physics the Chinese Academy of Sciences P.O. Box 31 Lanzhou 730000 China

By using φ-mapping method,we discuss the topological structure of the self-duality solution in Jackiw-Pimodel in terms of gauge potential *** set up relationship between Chern-Simons vortex solution andtopological number,which is determined by Hopf index and Brouwer *** also give the quantization of flux inthis ***,we study the angular momentum of the vortex,which can be expressed in terms of,the flux.

关键词： topological structure vortex Jackiw-Pi model

Studies of low-lying states of even-even Xe isotopes within the nucleon pair approximation

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Science china(physics,Mechanics & Astronomy) 2011年第S1期54卷 103-108页

作者： ZHANG LiHua1, JIANG Hui1,2 & ZHAO YuMin1,3,4 1Institute of nuclear, Particle, Astrophysics and Cosmology, Department of physics, Shanghai Jiao Tong University, Shanghai 200240, china 2School of Arts and Sciences, Shanghai Maritime University, Shanghai 200135, china 3center of theoretical nuclear physics, national laboratory of heavy ion accelerator, lanzhou 730000, china 4CCAST, World laboratory, P.O. Box 8730, Beijing 100080, china 1. Institute of nuclear Particle Astrophysics and Cosmology Department of Physics Shanghai Jiao Tong University Shanghai 200240 China2. School of Arts and Sciences Shanghai Maritime University Shanghai 200135 China3. Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China4. CCAST World Laboratory P.O. Box 8730 Beijing 100080 China

We study the relevance of nucleon pairs with higher spins, in addition to spin-zero and spin-two pairs (i.e., S D pairs), in low-lying states of even-even Xe nuclei. By including those higher-spin pairs in our configuration, we recalculate energy level schemes, elec trical quadrupole moments, magnetic moments and electric quadrupole transition rates, for low-lying states of even-even 128-142Xe nuclei. The agreement between our calculated results and the experimental data is substantially improved in comparison with previous studies.

关键词： nucleon pair approximation shell model configuration space low-lying states