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Charmed Baryon in Diquark Model

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原子核物理评论 2009年第S1期26卷 190-193页

作者： WANG Qing-wu1,3, ZHANG Peng-ming1,2(1 Institute of Modern Physics, Chinese Academy of Sciences, lanzhou 73.000, china 2 center of Theoretical nuclear Physics, national laboratory of heavy ion Research Facility in lanzhou,lanzhou 73.000, china 3 Graduate School of Chinese Academy of Sciences, Beijing 100049, china) Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Graduate School of Chinese Academy of Sciences Beijing 100049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China center of Theoretical nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China

A diquark model is used to investigate single-charmed baryons. In this model,baryon is composed of two diquarks and an antiquark. Masses of lowest lying states with JP=1/2± are obtained. Baryons in our results are as heavy as other theoretic predictions and we suggest that the five-quark components should be considered in any three-quark model for studying the charmed baryons.

关键词： charm diquark pentaquark

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 73.000,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 73.000,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

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 73.000,china 2 School of nuclear Science and Technology,lanzhou University,lanzhou 73.000,china 3 center of Theoretical nuclear Physics,national laboratory of heavy ion Research Facility in lanzhou,lanzhou 73.000,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

Systematic study of survival probability of excited superheavy nuclei

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Science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 109-113页

作者： XIA ChengJun1, SUN BaoXi1, ZHAO EnGuang2,3 & ZHOU ShanGui2,3 1College of Applied Sciences, Beijing University of Technology, Beijing 100124, china 2Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, china 3center of Theoretical nuclear Physics, national laboratory of heavy ion accelerator, lanzhou 73.000, china Beijing University of Technology College of Applied Sciences Beijing China (GRID:grid.28703.3e) (ISNI:***) Chinese Academy of Sciences Institute of Theoretical Physics Beijing China (GRID:grid.9227.e) (ISNI:***) national laboratory of heavy ion accelerator Center of Theoretical Nuclear Physics Lanzhou China (GRID:grid.450259.f) (ISNI:0000 0004 1804 2516)

The stability of excited superheavy nuclei (SHN) with 100 Z 134 against neutron emission and fission is investigated by using a statistical model. In particular, a systematic study of the survival probability against fission in the 1n-channel of these SHN is made. The present calculations consistently take the neutron separation energies and shell correction energies from the calculated results of the finite range droplet model which predicts an island of stability of SHN around Z = 115 and N = 179. It turns out that this island of stability persists for excited SHN in the sense that the calculated survival probabilities in the 1n-channel of excited SHN at the optimal excitation energy are maximized around Z = 115 and N = 179. This indicates that the survival probability in the 1n-channel is mainly determined by the nuclear shell effects.

关键词： survival probability superheavy elements island of stability neutron emission fission

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 73.000,china 3 Institute of Modern Physics,Chinese Academy of Sciences,lanzhou 73.000,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

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 73.000, china 4CCAST, World laboratory, P.O. Box 8730, Beijing 100080, china Shanghai Jiao Tong University Institute of Nuclear Particle Astrophysics and Cosmology Department of Physics Shanghai China (GRID:grid.16821.3c) (ISNI:***) Shanghai Jiao Tong University Institute of Nuclear Particle Astrophysics and Cosmology Department of Physics Shanghai China (GRID:grid.16821.3c) (ISNI:***) Shanghai Maritime University School of Arts and Sciences Shanghai China (GRID:grid.412518.b) (ISNI:***) Shanghai Jiao Tong University Institute of Nuclear Particle Astrophysics and Cosmology Department of Physics Shanghai China (GRID:grid.16821.3c) (ISNI:***) national laboratory of heavy ion accelerator Center of Theoretical Nuclear Physics Lanzhou China (GRID:grid.450259.f) (ISNI:0000 0004 1804 2516) CCAST World Laboratory Beijing China (GRID:grid.464262.0) (ISNI:0000 0001 0318 1175)

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

Calculation of triaxial superdeformation in ^(174)Hf

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Science china(Physics,Mechanics & Astronomy) 2007年第5期50卷 553-557页

作者： YU ShaoYing1,2,4, LI XiaoWei2, SHEN CaiWan1,5 & CHEN YongShou3,4 1 School of Science, Huzhou Teachers College, Huzhou 313000, china 2 College of Mathematics, Physics and Information Engineering, Zhejiang Normal University, Jinhua 321000, china 3 china Institute of Atomic Energy, Beijing 102413, china 4 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, china 5 center of Theoretical nuclear Physics, national laboratory of heavy ion accelerator of lanzhou, lanzhou 73.000, china School of Science Huzhou Teachers College Huzhou 313000 China

A two-dimensional Total Routhian Surface (TRS) calculation with the fixed hexa- decapole deformation ε4 = 0.03 was carried out for several configurations of 174Hf. Results indicate that the shell corrections have an important contribution to the formation of triaxial superdeformation in 174Hf and some possible configuration assignments are made to the 4 TSD bands experimentally found in 174Hf.

关键词： Total Routhian Surface (TRS), triaxial superdeformation, configuration

theory study of shapes in ^(187,189)Tl nuclei

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Science china(Physics,Mechanics & Astronomy) 2009年第6期52卷 818-821页

作者： LIU YanXin1, YU ShaoYing1,2,3, SHEN CaiWan1,5 & DONG YongSheng1,2,4 1 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 Department of Physics, Jining Teachers College, Jining 012000, china 5 center of Theoretical nuclear Physics, national laboratory of heavy ion accelerator of lanzhou, lanzhou 73.000, china School of Science Huzhou Teachers College Huzhou China School of Science and Information Engineering Zhejiang Normal University Jinhua China Institute of Theoretical Physics Chinese Academy of Sciences Beijing China center of Theoretical nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China Department of Physics Jining Teachers College Jining China

The nuclear shapes of 187,189Tl were investigated theoretically in this work. The total routhian surface (TRS) calculations were performed for N=106 and 108 isotopes of thallium (Z=81). The single-particle energies were obtained from the deformed Woods-Saxon potential, with the Lipkin-Nogami (LN) treatment of pairing. It is found that the collective oblate rotation coexists with the high-K prolate rotation. Superdeformed prolate rotation is included in this calculation.

关键词： nuclear shape oblate rotation prolate rotation

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 73.000, china 5 Department of Physics, Jining Teachers College, Jining 012000, china Huzhou Teachers College School of Science Huzhou China (GRID:grid.411440.4) (ISNI:***) Zhejiang Normal University School of Science and Information Engineering Jinhua China (GRID:grid.453534.0) (ISNI:***) Huzhou Teachers College School of Science Huzhou China (GRID:grid.411440.4) (ISNI:***) Zhejiang Normal University School of Science and Information Engineering Jinhua China (GRID:grid.453534.0) (ISNI:***) Chinese Academy of Sciences Institute of Theoretical Physics Beijing China (GRID:grid.9227.e) (ISNI:***) Huzhou Teachers College School of Science Huzhou China (GRID:grid.411440.4) (ISNI:***) Huzhou Teachers College School of Science Huzhou China (GRID:grid.411440.4) (ISNI:***) Zhejiang Normal University School of Science and Information Engineering Jinhua China (GRID:grid.453534.0) (ISNI:***) national laboratory of heavy ion accelerator of lanzhou Center of Theoretical Nuclear Physics Lanzhou China (GRID:grid.450259.f) (ISNI:0000 0004 1804 2516) Huzhou Teachers College School of Science Huzhou China (GRID:grid.411440.4) (ISNI:***) Zhejiang Normal University School of Science and Information Engineering Jinhua China (GRID:grid.453534.0) (ISNI:***) Jining Teachers College Department of Physics Jining China (GRID:grid.452558.b)

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