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Empirical evidence for the nucleus at the critical point of the Uπν（5）-SUπν*（3） transition in IBM2

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Empirical evidence for the nucleus at the critical point of ...

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： Da-li Zhang~(1 1)) Zhan-feng Hou~(2.2.) Yu-xin Liu~(2.3 3)) 1(Department of Physics,Huzhou Techer's College,Huzhou 313000,Zhejiang,china) 2.Department of Physics and State Key laboratory of {2. Physics and Technology,Peking University,Beijing 100871, china) 3(center of theoretical {2. Physics,national laboratory of heavy ion Accelerator,lanzhou 730000,china)

By analyzing the low-lying energy spectrum,certain energy rations and B（E2. ratios,we show that the predicted properties of the critical point of the transition from U（5） symmetry to SU（3） symmetry agree well with the experimental data of nucleus *** indicates that Xe is an empirical evidence for the nucleus at the critical point of the U（5）-SU（3） transition and such a critical point may involve considerable constituent ofγ-unstable rotation.

关键词： 130Xe second-order transition

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

Solutions of Non-Autonomous Quantum Systems with Symplectic Algebraic Structure

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Solutions of Non-Autonomous Quantum Systems with Symplectic ...

中国数学力学物理学高新技术交叉研究会第9届学术研讨会

作者： Jie Quanlin~1 Wang Shunjin~(1,2.3) (1.Institute of Modern Physics,Southwest Jiaotong University Chengdu 610031 china 2.Department of modem Physics,lanzhou University {2. china 3.center of theoretical Physics,CCAST(World laboratory)Beijing china.)

＜正＞Based on the structure of sub-algebraic chain of sp（2.）Lie algebra,we obtain solutions of a non-autonomous quantum system with Hamiltonian that can be treated as a linear function of generators of an sp（2.）symplectic *** Hamiltonian is transformed into a function of commutable Cartan operators by a set of gauge *** solutions of the equations of motion are obtained from the inverse gauge transformations. An sp（4）model describing a charged particle in a Paul trap interacting with a single mode of electromagnetic field serves as an illustration.

关键词：

Impact of industrial wastewater disposal on surface water bodies in Mostord area, North Greater Cairo

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Journal of Environmental Sciences 2001年第4期13卷 485-490页

作者： M.F.Abdel Sabour 1, F.H.Rabie 2. T.Mostafa 3, S.A.Hassan 4 (1 Soil and Water Pollution Unit, nuclear {2. center, Egypt. 2.Soil Department, Faculty of Agricultural, Ain Shams University, Egypt 3 Soils, Water and Environment {2. Instit Soil and Water Pollution Unit Nuclear Research Center 埃及 Ain Shams University 埃及 Soils Water and Environment Research Institute ARC 埃及 Soils Water and Environment Research InstituteARC 埃及

The studied area (Shoubra El Khima, Bahteem and Mostorod) lies in the industrial area north of Greater Cairo. The area suffers from several environmental problems such as sewage and disposal of pollutants from the surrounding factories into the surface water pathways in the area. Water samples were collected seasonally from different waterways found in the area, domestic and or industrial liquid wastes from 12.discharge tubes of different factories (as a point source of pollution). Chemical characteristics of different water samples and its heavy metals content were determined using ion coupled plasma technique (ICP). Results indicate that industrial and domestic wastewater samples contain several toxic levels of tested heavy metals (Cd, Co, Pb and Ni) which have a serious impact on surface waterways in the area. Shebin El Qanater collector drain samples exhibited the highest levels of Cd, Co, Pb and Ni compared to other tested water bodies. Mostorod collector drain samples showed the highest levels of Zn and Cu. Industrial effluent samples collected from Cairo Company for Fabric industry had the highest amounts of total Zn Cu, Cd, Co and Pb, while Delta steel company discharges the highest amounts of total Fe and Mn. Al Ahleya Plastic Company discharges the highest amounts of total Ni. Generally, it is necessary to impose the environmental laws and its regulation regarding the industrial wastewater treatments and disposals to minimize the risk of the adverse effects of these pollutants.

关键词： industrial wastewater disposal north Greater Cairo Egypt

Neutron Halo in Deformed Nuclei

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Neutron Halo in Deformed Nuclei

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. of theoretical nuclear Physics,national laboratory of heavy ion Accelerator,lanzhou 730000,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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有限温度下Na4团簇的异构化

原子与分子物理学报 1999年第1期16卷 33-38页

作者：王锋张丰收柯学志朱志远兰州重离子加速器国家实验室原子核理论研究中心中国科学院近代物理研究所中国科学院上海原子核所

在紧密结合分子动力学模型基础上，对Ｎａ４的两种异构体Ｄ２ｈ和Ｃ２ｖ的结构性质随温度的变化进行了系统性研究。发现在低温时（温度Ｔ＜１００Ｋ），这两种异构体具有明显的不同；在较高温度时（温度Ｔ≥１００Ｋ），能够发现Ｃ２ｖ... 详细信息

在紧密结合分子动力学模型基础上，对Ｎａ４的两种异构体Ｄ２ｈ和Ｃ２ｖ的结构性质随温度的变化进行了系统性研究。发现在低温时（温度Ｔ＜１００Ｋ），这两种异构体具有明显的不同；在较高温度时（温度Ｔ≥１００Ｋ），能够发现Ｃ２ｖ和Ｄ２ｈ两种异构体之间的转变；在更高温度时（温度Ｔ＝４００Ｋ），这两种异构体Ｃ２ｖ和Ｄ２ｈ都处于液态。

关键词： Na4团簇异构化紧密结合分子动力学模型

Isospin Dependent Effective Interaction

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Isospin Dependent Effective Interaction

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 102.13also center of {2. theoretical Physics,national laboratory of heavy ion AcceleratorXanzhou 730000 and Institute of theoretical Physics.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

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

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

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 {2. Physics, national laboratory of heavy ion Accelerator,lanzhou 730000, P.R.china2. Institute of Modem Physics, The Chinese Academy of Sciences, lanzhou 730000, P.R.china 3.Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, P.R.china4.Physics department of Nanjing University, Nanjing 2.0008, 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

Study of proton resonances in ^(18)Ne via resonant elastic scattering of ^(17)F+p and its astrophysical implication

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Science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 32-36页

作者： HE JianJun1, HU Jun1,2. XU ShiWei1, CHEN ZhiQiang1, ZHANG XueYing1, WANG JianSong1, YU XiangQing1, ZHANG LiYong1,2. LI Long1,2. YANG YanYun1,2. MA Peng1,2. ZHANG XueHeng1, HU ZhengGuo1, GUO ZhongYan1, XU Xing1,2. YUAN XiaoHua1, LU Wan1,2. YU YuHong1, ZANG YongDong1,2. TANG ShuWen1,2. YE RuiPing1,2. CHEN JinDa1,2. JIN ShiLun1,2. DU ChengMing1,2. WANG ShiTao1,2. MA JunBing1,2. LIU LongXiang1,2. BAI Zhen1,2. LEI XiangGuo1, SUN ZhiYu1, ZHANG YuHu1, ZHOU XiaoHong1, XU HuShan1, SU Jun3, LI ErTao3, WANG HongWei4, TIAN WenDong4 & LI XiangQing5 1 Institute of Modern Physics (IMP), Chinese Academy of Sciences, lanzhou 730000, china 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, china 3 china Institute of Atomic Energy (CIAE), Beijing 102.13, china 4 Shanghai Institute of Applied Physics (SINAP), Chinese Academy of Sciences, Shanghai 2.1800, china 5 School of Physics and State Key laboratory of nuclear Physics and Technology, Peking University, Beijing 100871, china Institute of Modern Physics (IMP) Chinese Academy of Sciences Lanzhou China Graduate University of Chinese Academy of Sciences Beijing China china Institute of Atomic Energy (CIAE) Beijing China Shanghai Institute of Applied Physics (SINAP) Chinese Academy of Sciences Shanghai China School of Physics and State Key laboratory of nuclear Physics and Technology Peking University Beijing China

The proton resonant properties in 18Ne, which determine the reaction rate of the key stellar 14O(α,p)17F reaction, have been studied by using a technique of proton resonant elastic scattering of 17F+p. A 4.2. MeV/nucleon 17F radioactive ion (RI) beam was produced via a projectile-fragmentation reaction, and separated by a Radioactive ion Beam Line in lanzhou (RIBLL). By bombarding a thick (CH2.n target, the energy spectra of the recoiled protons were measured by two ΔE-E silicon telescopes at the center-of-mass scattering angles of θc.m.≈175°±5°, θc.m.≈152.±8°, respectively. Several proton resonances in 18Ne were ob served clearly. A further R-matrix analysis of the experimental data is under way to determine the resonant parameters. The present work reports the preliminary results briefly.

关键词： resonant reaction reaction rate explosive burning accreting binary systems