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CCAST“放射性束物理”研讨会

作者： W.Z. Jiang, Z.Y. Zhu and Z.Z. Ren Shanghai Institute of nuclear Research, Chinese Academy of Sciences,Shanghai 201800,China center of theoretical nuclear physics,national laboratory of heavy ion accelerator, lanzhou 73.000,China Department of physics, Nanjing University, Nanjing 210093. China

The relativistic density dependent Hartree framework,where the relativistic two-bodycorrelations are incorporated,is developed to describe properties of halo *** phe-nomenology of two-body correlations in halo nuclei is considered ***-neutron halo nucleus Li,together with the one-neutron halo nucleus C,is *** energies and halo tails of above halo nuclei are nicely *** large root-mean-square (rms) radii of halo nulcei are close to those extractedfrom the experimental *** is found that the contribution of two-body correlations isimportant to describe halo nuclei,especially for nuclei with two or more halo neutrons.

关键词： Two-body correlation halo nucleus relativistic Hartree approach

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the study of the nucleon pair approximation

the study of the nucleon pair approximation

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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： Y.Lei~(1 1)) Z.Y.Xu~(1 2)) Y.M.Zhao~(1,2 2)) 1(Department of physics,Shanghai Jiao Tong University,Shanghai 200240,China) 2(center of theoretical {3. physics,national laboratory of heavy ion accelerator,lanzhou 73.000,China)

We first study structure coefficients of collective pairs with spin zero and spin two（SD） in a number of configurations by a few realistic *** investigate the robustness of these structure coefficients. Second,we study the validity of pair truncation of the nuclear shell model by using the semi-magic nucleus *** present low-lying states based on both nucleon pair approximation（NPA） and exact shell-model （SM） *** also calculate overlaps between wave functions of low-lying states calculated by using the NPA and those calculated by using the ***,we perform systematic calculations on low-lying states of nuclei with A = 202-212,using the *** use a phenomenological shell-model *** building blocks of our model space include one J = 4 valence neutron pair,and one J = 4,6,8 valence proton pair,in addition to the usual S and D *** calculate binding energies,excitation energies,electric quadrupole and magnetic dipole moments of low-lying states,and E2 transition rates between low-lying states. Our calculated results are reasonably consistent with available experimental *** calculated quadrupole moments and magnetic moments,many of which have not yet been measured for these nuclei,are useful for future experimental measurements.

关键词： nucleon pair truncation of the shell model calculation on spectrum property of the wave-function

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A bound on the effective boson number from shape phase transition in IBM

A bound on the effective boson number from shape phase trans...

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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： Yu Zhang~(1 2)) Zhan-feng Hou~(2)) Yu-xin Liu~(2 3.) Feng Pan~(1)) 1(Department of physics,Liaoning Normal University,Dalian 116029,China) 2(Department of physics and State Key laboratory of {3. physics and Technology Peking University,Beijing 100871, China) 3.center of theoretical nuclear physics,national laboratory of heavy ion accelerator,lanzhou 73.000,China)

We study the effects driven by the boson number on the critical behavior of some observable quantities that are sensitive to the nuclear shape phase transitions in the interacting boson model（IBM）.By comparing the experiments with the theory calculation,we find that the effective boson number in IBM best consistent to experiments is not more than the total pairs number of valence nucleons or holes,and an up bound of the effective boson number can be found in the U（5）-O（6） transition region at least in ***, two trajectories of second order phase transitions,the isotones with neutron number N_n=62 and the one with N_n=74,are confirmed by comparing the observable quantities in experiments with those in theory

关键词： keyword1 keyword2 keyword3 keyword4

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化学非平衡夸克-胶子物质中等质量双轻子的产生

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物理学报 2003年第11期52卷 2831-2835页

作者：贺泽君龙家丽马国亮马余刚张家驹刘波中国科学院上海原子核研究所中国科学院高能物理研究所北京100039

研究了正在进行化学平衡的富重子夸克胶子物质的双轻子产生 ,发现由于产生在RHIC能量的化学非平衡的富重子夸克胶子物质冷却慢和高的初始温度 ,导致中等质量双轻子产生重大增强 .因此 ,中等质量双轻子的增强可以是夸克胶子物质形... 详细信息

研究了正在进行化学平衡的富重子夸克胶子物质的双轻子产生 ,发现由于产生在RHIC能量的化学非平衡的富重子夸克胶子物质冷却慢和高的初始温度 ,导致中等质量双轻子产生重大增强 .因此 ,中等质量双轻子的增强可以是夸克胶子物质形成的信号 .同时 ,这个增强能补偿由于初始夸克化学势增加引起的双轻子抑制 ,因而双轻子产额的抑制不再是夸克胶子物质产生的信号 .

关键词：化学非平衡夸克-胶子物质双轻子热粲夸克夸克化学势夸克碰撞热力学平衡

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Effects of isospin and momentum dependent interactions on liquid-gas phase transition in hot asymmetric nuclear matter

Effects of isospin and momentum dependent interactions on li...

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2007年全国核反应会暨生物物理与核物理学科交叉前沿研讨会

作者： Jun Xu~1 Lie-Wen Chen~(1,2) Bao-An Li~3.Hong-Ru Ma~1 1(Institute of theoretical physics,Shanghai Jiao Tong University,Shanghai 200240,China) 2(center of theoretical nuclear physics,national laboratory of heavy-ion accelerator,lanzhou,73.000,China) 3.Department of physics,Texas A&M University-Commerce,Commerce,TX 75429,and Department of Chemistry and physics,P.O.Box 419,Arkansas State University,State University,AR 72467-0419,USA

The liquid-gas phase transition in hot neutron-rich nuclear matter is investigated within a self-consistent thermal model using an isospin and momentum dependent interaction (MDI) constrained by the isospin diffusion data in heavy-ion collisions, a momentum-independent interaction (MID), and an isoscalar momentum-dependent interaction (eMDYI). The boundary of the phase-coexistence region is shown to be

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Effects of isospin and momentum dependent interactions on liquid-gas phase transition in hot asymmetric nuclear matter

Effects of isospin and momentum dependent interactions on li...

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第十三届全国核物理大会暨第八届会员代表大会

作者： Jun Xu~(1)) Lie-Wen Chen~(1,2)) Bao-An Li~(3.) Hong-Ru Ma~(1)) 1)Institute of theoretical physics,Shanghai Jiao Tong University,Shanghai200240,China 2)center of theoretical nuclear physics,national laboratory of heavy-ion accelerator,lanzhou,73.000,China 3.Department of physics,Texas A&M University-Commerce,Commerce,TX 75429,and Department of Chemistry and physics,P.O.Box 419,Arkansas State University,State University,AR 72467-0419,USA

The liquid-gas phase transition in hot neutron-rich nuclear,matter is investigated within a self-consistent thermal model using an isospin and momentum dependent interaction (MDI) constrained by the isospin diffusion ...

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Neutron Halo in Deformed Nuclei

Neutron Halo in Deformed 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： Shan-Gui Zhou~(1,2 1)) Jie Meng~(3.4,1,2) P.Ring~5 En-Guang Zhao~(1,2,3. 1(Institute of theoretical physics,Chinese Academy of Sciences,Beijing 100190,China) 2(center of theoretical nuclear physics,national laboratory of heavy ion accelerator,lanzhou 73.000,China) 3.School of physics,Peking University,Beijing 100871,China) 4(School of physics and nuclear Engineering Science,Beihang University,Beijing 100191,China) 5(Physikdepartment,Technische Universitat Munchen,85748 Garching,Germany)

Halo phenomena in nuclei are driving forces for the development of the physics with radioactive ion beams. They are threshold effects and have been first observed in the weakly bound system *** that most open shell nuclei are deformed,the interplay between deformation and weak binding raises interesting questions,such as whether or not there exist halos in deformed nuclei and,if yes,what are their new features. In order to describe adequately the halo phenomena in deformed nuclei,contributions of the halo,deformation effects,and large spatial extensions of these systems should be considered in a fully self-consistent way.A deformed relativistic Hartree Bogoliubov（DRHB） theory has been developed in which the DRHB equations are solved in a spherical Woods-Saxon basis with the proper asymptotic behavior at large distance from the nuclear center.

关键词： Neutron halo deformed nuclei shape decoupling relativistic Hatree-Bogoliubov model

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Improved Glauber model for the reactions induced by Halo Nuclei and Stable Nuclei

Improved Glauber model for the reactions induced by Halo Nuc...

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CCAST“放射性束物理”研讨会

作者： Wenjun Guo, Huanqing Jiang, Jianye Liu Wei zuo, Zhongzhou Ren, Xiguo Lee, Zenghua Li1. center of theoretical nuclear {3., national laboratory of heavy ion accelerator,lanzhou 73.000, P.R.China2. Institute of Modem {3., The Chinese Academy of Sciences, lanzhou 73.000, P.R.China 3.Institute of High Energy {3., The Chinese Academy of Sciences, Beijing 10003., P.R.China4.{3. department of Nanjing University, Nanjing 210008, P.R.China

＜正＞We develop the method for the calculation of the total reaction cross sections induced by thehalo nuclei and stable nuclei. This approach is based on the Glauber theory, which is valid for thereactions at high energies. It is extended for reactions at low energy and at the intermediate energy bycorrecting with the quantum correction and Coulomb correction under the assumption of the effectivenuclear density distribution. The calculated results for the total reaction cross section induced by stablenuclei agrees well with the experimental data within 10 percent accuracy. The comparison between thenumerical results and the experimental data for the neutron halo nucleiand the proton halo nucleiindicates a satisfactory agreement after considering the halo structure of these nuclei, which implies thequite different mean fields for the reactions induced by halo nuclei and stable nuclei. The halo nucleondistributions and the root mean square radii of these nuclei can be extracted from above ***, it is clear to see that the medium correction of the nucleon-nucleon collision has little effecton the total reaction cross sections induced by the halo nuclei due to the very weak binding and the veryextended density distribution, which is quite different from the reactions induced by the stable nucleiwith the salient medium correction.

关键词： total reaction cross section improved Glauber theory halo nuclei

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Isospin Dependent Effective Interaction

Isospin Dependent Effective Interaction

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CCAST“放射性束物理”研讨会

作者： Ma Zhong-yu, Liu Ling, Chen Bao-qiu China Institute of Atomic Energy, Beijing 102413.lso center of nuclear theoretical {3.,national laboratory of heavy ion acceleratorXanzhou 73.000 and Institute of theoretical {3..Beijing 100080

The asymmetric nuclear matter is investigated in the DBHF approach with a newdecomposition of the Dirac structure of nucleon self-energy from the G matrix. It isfound that the isospin dependence of the scalar and vector potentials is rather weak,although both potentials for neutron(proton) become deep(shallow) in the neutron richnuclear matter. The results in asymmetric nuclear matter are rather different fromthose obtained in a simple method, where the nucleon self-energy is deduced from thesingle particle energy. The nuclear binding energy as a function of the asymmetryparameter fulfills the empirical parabolic law up to very extreme isospin asymmetricnuclear matter in the DBHF approach. The behavior of the density dependence of theasymmetry energy is different from those obtained in non-relativistic approaches,although both give similar asymmetry energy at the nuclear saturation density.

关键词： Dirac structure of nucleon self-energy Dirac G matrix Asymmetric nuclear matter

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Evaluation and Calculation of Activation Cross Sections for 169Tm(n,2n), (n,3.), (n,γ) and (n,x) Reactions Below 20 MeV

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中国核科技报告 1997年第S3期 72-79页

作者： Yu Baosheng (China nuclear Data center, CIAE)Tang Guoyou Shi Zhaomin (Institute of heavy {3. {3., Peking University)

IntroductionTm is a rare-earth element. Its activation cross sections are a good indicator for {3. science and technology applications. However, there are no evaluated data in several {3. data libraries. The activation cross sections forTm(n,2n), (n,3.), (n,γ) and some emission charged particle (n,x) reactions below 20 MeV were evaluated and calculated on the basis of experimental and theoretical data.

关键词： Evaluation and Calculation of Activation Cross Sections for Tm n,2n n,3. n,x Reactions Below 20 MeV and

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