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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 2.02.0,{2. 2.Center of Theoretical nuclear physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,{2. 3 Nishina Center,institute of Physical Chemical Research(RIKEN),Hirosawa 2.1,Wako-shi,Saitama 351-0198,Japan 4 CCAST,World Laboratory,beijing 100080,{2. 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

Coexistence of normal, super-, and hyper-deformation in nuclei: A study with angular momentum projection method

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Chinese Science Bulletin 2009年第3期54卷 358-363页

作者： SUN Yang1,2. ZHANG JingYe3, LONG GuiLu4,5 & WU ChengLi6,7 1 department of physics, Shanghai Jiao Tong University, Shanghai 2.02.0, {2. 2.Joint institute for nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA 3 department of physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA 4 department of physics, Tsinghua University, beijing 100084, {2. 5 Center of nuclear Theory, Lanzhou National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, {2. 6 department of physics, Xiamen University, Xiamen 361005, {2. 7 department of physics, Chung Yuan Christian University, Chung-Li, Taiwan 32.2., {2. department of physics Shanghai Jiao Tong University Shanghai 200240 China Joint institute for nuclear Astro{2. University of Notre Dame Notre Dame Indiana 46556 USA department of physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA department of physics Tsinghua University Beijing 100084 China Center of nuclear Theory Lanzhou National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China department of physics Xiamen University Xiamen 361005 China department of physics Chung Yuan Christian University Chung-Li Taiwan 32023 China

Angular-momentum-projected energy surface calculations for A ≈ 110 nuclei indicate three distinct energy minima occurring at different angular-momenta. These correspond to normal, super-, and hy- per-deformed shapes coexisting in one nucleus. 110Pd is studied in detail, with a quantitative prediction on super- and hyper-deformed spectra by the Projected Shell Model calculation. It is found that several other neighboring nuclei in the A-110 mass region, with the neutron number around 64, also exhibit clear super- and hyper-deformation minima in the projected calculation.

关键词：原子核光谱角动量能量

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 32.000, china 3 {2. 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 012.00, 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

X（3872. and Bound State Problem of D0*0（0 D*0）

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原子核物理评论 2009年第S1期 16-21页

作者： LIU Yan-rui1,LIU Xiang2.3,DENG Wei-zhen2.(1 institute of High energy {2.,Chinese Academy of Sciences,beijing 100049,china 2.department of {2.,Peking University,beijing 100871,china 3 Centro de Física Terica,Departamento de Física,Universidade de Coimbra,P-3004-516,Coimbra,Portugal)

We have performed a dynamical calculation of the bound state problem of D0D*0 by considering the pion and sigma meson exchange potential. Our preliminary analysis disfavors the molecular interpretation of X(3872. if we use the experimental D*Dπ coupling constant g=0.59 and a reasonable cutoff around 1 GeV,which is the typical hadronic scale. In contrast,there probably exists a loosely bound S-wave BB* molecular state. Such a molecular state would be rather stable since its dominant decay mode is the radiative decay through B*→Bγ.

关键词： X(3872. bound state molecule

Profile of the composition fractions in neutron stars

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Chinese Science Bulletin 2002年第8期47卷 632-634页

作者： LI Wenfei, ZHANG Fengshou & CHEN LiewenCenter of Theoretical nuclear physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, {2. institute of Modern physics, Chinese Academy of Sciences, Lanzhou 730000, {2. department of physics, Shangh Center of Theoretical nuclear physics National Laboratory of Heavy Ion Accelerator Lanzhou China institute of Modern physics Chinese Academy of Sciences Lanzhou China department of physics Shanghai Jiao Tong University Shanghai China

The composition fractions of β-stable neutron stars and their radial distributions are investigated based on Skyrme-Hartree-Fock theory and Tolman-Oppenheimer-Volkoff (TOV) equation. It is found that a pure neutron interior with a radius of 3.5 km can exist in the neutron stars. When the radius is greater than 3.5 km, the fractions of the proton, electron and μ- appear and increase with the increment of the radius, then decrease after reaching their maximum at the radius of 8 km. These results make it possible to further study the thermal evolution and magnetic properties of the neutron stars.

关键词： neutron stars compositon fractions asymmetric nuclear matter equation of state Tolman-Oppenheimer-Volkoff equation.

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 32.000, china 3 {2. of Theoretical physics, Chinese Academy of Sciences, beijing 100080, china 4 department of physics, Jining Teachers College, Jining 012.00, china 5 Center of Theoretical nuclear physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, china School of Science Huzhou Teachers College Huzhou 313000 China School of Science and Information Engineering Zhejiang Normal University Jinhua 321000 China institute of Theoretical physics Chinese Academy of Sciences Beijing 100080 China department of physics Jining Teachers College Jining 012000 China Center of Theoretical nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 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

xF(or y)-Dependence of Nuclecir Absorption and energy Loss Effects on J/ψ Production

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Communications in Theoretical physics 2009年第12期52卷 1049-1054页

作者： WANG Hong-Min,~(1,*) SUN Xian-Jing,~2.and ZHANG Ben-Ai~31 physics department, Academy of Armored Forces Engineering of PLA, {2. 100072. china2.institute of High energy physics, Chinese Academy of Sciences, {2. 100049, china3 institute of Applied physics and Computation Mathematics, {2. 100088, china

By means of the nuclear parton distribution studied only with lepton deep-inelastic scattering experimentaldata,the J/φ"normal nuclear absorption"and {2. loss effects are studied in a Glauber formalism at HERA andRHIC *** that the absorption cross section σincreases with the charmonium-nucleon center of mass{2.,the results reveal a significant dependence of the σon rapidity y at RHIC *** initial-state {2.loss effect,which is found important only at HERA energies,is also considered,and its influence should be eliminatedwhen we studied the absorption effect at low collision ***,we also present the theoretical prediction forLHC.

关键词： x_F (or y)-dependence of absorption effect Glauber formalism energy loss

X-ray spectra induced by ^(12.)Xe^(q+) impacting the metal surface

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Science china(physics,Mechanics & Astronomy) 2008年第1期51卷 82-89页

作者： ZHANG XiaoAn 1,2.,XIAO GuoQing 1 ,YANG ZhiHu 1 ,CHEN XiMeng 3 ,ZHAO YongTao 1 , LI FuLi 4 ,WANG Li 1,2.,CUI Ying 3 ,ZHANG HongQiang 3 &ZHAN WenLong 1 1institute of Modern physics,Chinese Academy of Sciences,Lanzhou 730000,{2. 2.3} of physics,Xianyang Normal University,Xianyang 712.00,{2. 3department of Modern physics,Lanzhou University,Lanzhou 730000,{2. 4department of Applied physics,Xi’an Jiaotong University,Xi’an 710049,{2. 1. institute of Modern physics Chinese Academy of Sciences Lanzhou 730000 China 2. department of physics Xianyang Normal University Xianyang 712000 China 3. department of Modern physics Lanzhou University Lanzhou 730000 China 4. department of Applied physics Xi’an Jiaotong University Xi’an 710049 China

Using the slow highly charged ions 12. Xe q+ (q=2.,2.,2.;initial kinetic T0≤4.65 keV/a.u.)to impact Au surface,the Au atomic Mαcharacteristic X-ray spectrum is *** result shows that as long as the charge state of projectile is high enough,the heavy atomic characteristic X-ray can be effectively excited even though the incident beam is very weak(nA magnitude),and the X-ray yield per ion is in the order of 10-8and increases with the kinetic {2. and potential {2. of *** measuring the Au Mα-X-ray spectra,Au atomic N-level lifetime is estimated at about 1.33×10-18s based on Heisenberg uncertainty relation.

关键词： slow highly charged ions characteristic X-ray level lifetime

Near infrared lights emission of ^(40)Ar^(16+) impacting on metal surfaces

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Science china(physics,Mechanics & Astronomy) 2009年第7期52卷 1021-1026页

作者： ZHANG XiaoAn1,2. XIAO GuoQing2. YANG ZhiHu2. WANG Li1 & ZHAN WenLong2.1 department of physics, Xianyang Normal University, Xianyang 712.00, {2. 2.institute of Modern physics, Chinese Academy of Sciences, Lanzhou 730000, {2. department of physics Xianyang Normal University Xianyang 712000 China institute of Modern physics Chinese Academy of Sciences Lanzhou 730000 China

The highly charged ion 40Ar16+ with the velocity (kinetic energy EK=150 keV, velocity V=8.5×105 m/s) smaller than Bohr velocity (VBohr=2.9×106 m/s) was found to hove impacts on the surfaces of metals Ni, Mo, Au and Al, and the Ar atomic infrared light lines and X-rays spectra were simultaneously measured. The experimental results show that the highly charged ion that captures electrons is neutralized, and the multiply-excited hollow atom forms. The hollow atom cascade decay radiates lights from infrared to X-ray spectrum. The intensity of infrared lights shows that the metallic work functions play an important role in the neutralization process of highly charged ions during their interaction with metallic surfaces, which verifies the classical over-the-barrier model.

关键词： infrared light lines X-ray neutralization highly charged ions