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Full fermion-boson vertex function derived in terms of symmetry relations in Abelian gauge theory

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Science China(Physics,Mechanics & Astronomy) 2008年第9期51卷 1206-1213页

作者： he hanxin China Institute of {2. {3., beijing 102.13, China China Institute of atomic energy Beijing China

Nonperturbative studies such as confinement and dynamical chiral symmetry breaking need the nonperturbative interacting vertex functions. In this paper, an approach to determining the full fermion-boson vertex function in four-dimensional Abelian gauge theory is presented: this full vertex function is derived in terms of a set of normal (longitudinal) and transverse Ward-Takahashi relations for the fer-mion-boson (vector) and axial-vector vertices in the momentum space in the case of massless fermion. Such a derived fermion-boson vertex function should be sat-isfied both perturbatively and nonperturbatively. The fact that such a derived full fermion-boson vertex function to one-loop order holds indeed is proven and the nonperturbative form of this vertex is also under discussion.

关键词： symmetry Ward-Takahashi relations full fermion-boson vertex function

Biasing fluctuation model for directional stepping motion of molecular motor

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Chinese Science Bulletin 1998年第22期43卷 1879-1882页

作者： BAO Jingdong 1 and ZHUO Yizhong 2.1. beijing Meteorological College, beijing 100081, China 2. China Institute of {2. energy, beijing 102.13, China beijing Meteorological College Beijing China China Institute of atomic energy Beijing China

The biasing fluctuation model with a colored noise is presented to study the directional stepping motion of the molecular motor. The expression of probability current is obtained in the adiabatic approximation. The fo... 详细信息

关键词： molecular motor stepping motion biasing force colored noise Langevin equation.

Exotic structure of the third excited state in^(2.)Na

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Chinese Science Bulletin 2005年第23期50卷 2677-2680页

作者： LI Xihan1,2.3. LIANG Yujie1,2.3. DENG Fuguo1,2.3. LIU Zuhua1,4 & ZHOU Hongyu1,2.3.1. Key Laboratory of Beam Technology and Material Modification of Minister of Education, beijing Normal University, beijing 100875, China 2. Institute of Low {2. Nuclear Physics, and Department of Material Science and Engineering, beijing Normal University, beijing 100875, China 3. beijing Radiation Center, beijing 100875, China 4. China Institute of atomic {2., beijing 102.13, China Key Laboratory of Beam Technology and Material Modification of Minister of Education Beijing Normal University Beijing 100875 China Institute of Low energy Nuclear Physics Department of Material Science and Engineering Beijing Normal University Beijing 100875 China beijing Radiation Center Beijing 100875 China China Institute of atomic energy Beijing 102413 China

The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) ra- dius (1/2. of the third excited state in 2.Na are calcu- lated by means of asymptotic normalization coefficie... 详细信息

The probability of the last proton being out of the binding potential, P and the root-mean-square (rms) ra- dius (2.1/2. of the third excited state in 2.Na are calcu- lated by means of asymptotic normalization coefficient (ANC) method with the experimental date existing. The results are P=54.73. and 2.1/2.5.2. fm respectively. The P value and the contribution of the asymptotic part to the 2.1/2.are compared with those of several other low {12. states in 2.Na. It is found that the valence particle in the third excited state has an obvious larger P than those of other states. The density distribution of the valence proton in this state is also compared with the nucleons in the nuclear core 2.Ne, and a far extended tail can be seen clearly. These results show that the third ex- cited state in 2.Na is a proton halo state.

关键词：钠第三激发态外部结构有效半径密度分布渐近标准化系数

Isospin-dependent relativistic microscopic optical potential in the Dirac Brueckner-Hartree-Fock method

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Science China(Physics,Mechanics & Astronomy) 2004年第2期47卷 189-198页

作者： RONG Jian1 & MA Zhongyu1,2.3.1. China Institute of atomic energy,{2., China 2. Center of Nuclear Theoretical Physics, National Laboratory of heavy Ion Accelerator of Lanzhou, Lan-zhou 73.000, China 3. Institute of Theoretical Physics, Chinese Academy of Sciences, beijing 100080, China Correspondence should be addressed to Rong Jian (email: jrong@***) China Institute of atomic energy Beijing China Center of Nuclear Theoretical Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China Institute of Theoretical Physics Chinese Academy of Sciences Beijing China

The relativistic microscopic optical potential in the asymmetric nuclear matter is studied in the framework of the Dirac Brueckner-Hartree-Fock method. A new decomposition of the Dirac structure of the nuclear self-energy in nuclear matter is adopted. The self-energy of a nucleon with E > 0 in nuclear matter is calculated with the G matrix in the Hartree-Fock approach. The optical potential of a nucleon in the nuclear medium is identified with the nucleon self-energy. The energy and asymmetric parameter dependence of the relativistic optical potentials for proton and neutron are discussed. The resulting Schroedinger equivalent potentials have reasonable behaviors of the energy dependence. The asymmetric parameter dependence of relativistic optical potentials and Schroedinger potentials are emphasized.

关键词： Dirac Brueckner Hartree-Fock, relativistic microscopic optical potential, asymmetric nuclear matter, isospin-dependence.

EXAFS Studies on Local atomic Structure in the Amorphous Mg_(65)Cu_(2.)Gd_(10) Alloy

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Journal of Wuhan University of Technology(Materials Science) 2011年第1期26卷 98-101页

作者：李国强 Business Development Department China Perfect Machinery Industry Corp. Ltd

Local atomic structures of an amorphous Mg65Cu2.Gd10 alloy and the structural changes by thermal annealing have been studied by extended X-ray absorption fine structure （EXAFS）. The correlation between structural changes and mechanical properties for the Mg65Cu2.Gd10 alloy has also been discussed. Results showed that Cu atoms around Gd in Mg65Cu2.Gd10 lost rapidly during annealing , resulting in the segregation of Cu atoms. The coordination number NGd-Mg of Mg65Cu2.Gd10 annealed at 3.3.K first diminished and then augmented with the increase of annealing time. The formation of polyhedral short-range order unit with coordination number of nearly 12.around Gd atoms is in favor of the improvement of mechanical properties. The chemical short-range order, not topological short-range order in the amorphous Mg65Cu2.Gd10 alloy had obvious changes during annealing.

关键词： magnesium alloy amorphous alloy short-range EXAFS mechanical properties annealing

Electronic structure and magnetism of R(Fe,Si)_(12. (R=Y,Nd)

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Science China(Physics,Mechanics & Astronomy) 2006年第2期49卷 195-202页

作者： SUN Guang’ai1, CheN Bo1, DU Honglin2. FAN Zhijian1, GAO Tao3.& QI Xinhua3.. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 62.900, China 2. Department of physics, Peking university, {2. 100871, China 3. Institute of atomic and Molecular Physics, Sichuan University, Chengdu 610065, China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang China Department of physics Peking university Beijing China Institute of atomic and Molecular Physics Sichuan University Chengdu China

The newly developed full-potential linearized augmented plane wave (LAPW) and local orbitals (lo) based on standard APW methods are briefly introduced, and the structure and magnetic properties of R(Fe, Si)12.compounds (R = Y, Nd) are calculated using the method. The distribution of Si at different sites is analyzed based on total energy of one crystal unit with structure having been optimized. The characters of magnetic mo-ments, total density of states (TDOS) and partial density of states (PDOS) for different crystal sites Si occupies are obtained and analyzed. The results show that the total mag-netic moments of RFe10Si2.(R = Y, Nd) are larger than those of RFe10M2.(M = Ti, V, Cr, Mn, Mo and W) and the hybridization mechanism is seen as follows. Si(8j) reduce the mag-netic moments of Fe at three sites, however, Si(8f) mainly reduce the magnetic moments of Fe(8i) and Fe(8j) atoms. The Curie temperature is markedly enhanced by the introduc-tion of Si atoms according to spin fluctuation of DOS at Fermi level.

关键词： (L)APW+lo method R(Fe Si)12.R = Y Nd) magnetic moment Density of state.

β-delayed proton decays near the proton drip line

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Science China(Physics,Mechanics & Astronomy) 2005年第3期48卷 257-267页

作者： XU Shuwei 1 , LI Zhankui 1 , XIE Yuanxiang 1 , HUANG Wenxue 1 , SHU Nengchuan 2., CheN Yongshou 2., XU Furong 3., WANG Kun 4 , PAN Qiangyan 1 , WANG Xudong 1 , YU Yong 1 & XING Yebing 1 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73.000, China 2. Nuclear Physics Department, China Institute of atomic {2.,{2., China 3. Department of Technical Physics, Peking University, beijing 100871, China 4. Shanghai Institute for Nuclear Research, Shanghai 2.1800, China Institute of Modern Physics Chinese Academy of Sciences Lanzhou China Nuclear Physics Department China Institute of Atomic Energy Beijing China Department of Technical Physics Peking University Beijing China Shanghai Institute for Nuclear Research Shanghai China

We briefly reviewed the experimental study on a-delayed proton decays near the proton drip line published by our group during the period of 1996―2.04, namely the first observation of the a-delayed proton decays of 9 new nuclides in the rare-earth region and the new measurements of a-delayed proton decays of 5 nuclides in the mass ～90 region near the N = Z line with the aid of the “p-?” coincidence in combination with a he-jet tape transport system. In the meantime some important experimental technique details were supplemented. The experimental results, including the half -lives, spins, parities, deformations and production reaction cross sections for the 14 nuclei were summarized and compared with the current nuclear-model predictions, and then the following points were represented. (1) The experimental half-lives for 85Mo and 92.h as well as the predicted “waiting point” nuclei 89Ru and 93Pd are 5―10 times longer than the theoretical predictions given by M?ller et al. using a macroscopic-microscopic model. It considerably influences the predictions of the abundances of the nuclides produced in the rp-process. (2. The current-model predictions are not consistent with the experimental assignments of the spins and parities for the proton drip-line nuclei 142.o and 12.Pm. However, the nuclear potential energy surface (PES) calculated by using a Woods- Saxon-Strutinsky method reproduced the experimental results. (3) The Alice code overestimated the production reaction cross sections of the studied 9 rare-earth nuclei by one order of magnitude or two, while HIVAP code overestimated them by one order of magnitude approximately.

关键词： proton drip line, β-delayed proton decay, he-jet tape transport system, "p-γ" coincidence, spin, parity, deformation, production reaction cross section.

Influence of magnetic current on the ground state entanglement in an isotropic transverse XY chain

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Progress in Natural Science:Materials International 2007年第10期17卷 1147-1151页

作者： Liu Dan1,2., Zhang Yong3.and Long Guilu1,2.1. Key Laboratory for atomic and Molecular NanoSciences, and Department of Physics, Tsinghua University, {3. 100084, China 2. Center of Quantum Information Science and Technology, Tsinghua National Laboratory for information Science and Technology, {3. 100084, China 3. Institute of Physics, School of Sciences, {3. University of Posts and Telecommunications, {3. 100876, China) Key Laboratory for atomic and Molecular NanoSciences Department of Physics Tsinghua University Beijing 100084 China Center of Quantum Information Science and Technology Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China Institute of Physics School of Sciences Beijing University of Posts and Telecommunications Beijing 100876 China

We study the ground state entanglement in a three-qubit XY chain under the influence of a magnetization current. It is found that the ground state changes from a W state to a disentangled state as the magnetic field varies. When the Lagrange multiplier λ>3. namely under a strong magnetic current, the ground state holds onto a W state for a large range of the magnetic field strength. A phase transition to the magnetization-current phase occurs under a certain condition.

关键词： heisenberg-XY chain magnetic-current phase transition.

atomic force microscopy studies of SrTiO_(3.(001)substrates treated by chemical etching and annealing in oxygen

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Science China(Physics,Mechanics & Astronomy) 2005年第4期48卷 459-468页

作者： WANG Xu1, FEI Yiyan1, LU Huibin1, JIN Kui-juan1, ZHU Xiangdong1,3. CheN Zhenghao1, ZHOU Yueliang1 & YANG Guozhen1 1. {3. National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,{3. 100080,China 2. Department of Physics,University of California, Davis,California,USA beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing China Department of Physics University of California Davis USA

The SrTiO3.(001) substrates treated by chemical etching in NH4F-buffered HF solution and annealing in oxygen ambient have been studied by an {2. force microscopy (AFM). The SrTiO3.substrates with TiO2.termineted and {2.ally smooth surfaces and single unit cell steps have been obtained. The surface morphologies of SrTiO3.substrates strongly depend on the treated conditions and the quality of the substrates.

关键词： SrTiO3. AFM, surface morphology, surface defects.