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X-ray spectra induced by ^(129)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 73.000,{3. 2Department of physics,Xianyang Normal University,Xianyang 712000,{3. 3.epartment of modern physics,lanzhou University,lanzhou 73.000,{3. 4Department of Applied physics,Xi’an Jiaotong University,Xi’an 710049,{3. Institute of modern physics Chinese Academy of Sciences Lanzhou China Department of physics Xianyang Normal University Xianyang China Department of modern physics Lanzhou University Lanzhou China Department of Applied physics Xi’an Jiaotong University China

Using the slow highly charged ions 129 Xe q+ (q=25,26,27;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 energy and potential energy of *** measuring the Au Mα-X-ray spectra,Au atomic N-level lifetime is estimated at about 1.3.×10-18s based on Heisenberg uncertainty relation.

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

Kinetic energy and charge state effects in the X-ray emission of Mo surface induced by Xe^(q+)(q=25,29) ions

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Science china(physics,Mechanics & Astronomy) 2008年第9期51卷 1240-1244页

作者： CUI Ying1,YANG ShengSheng2,YANG ZhiHu3.XU JinZhang1,ZHANG HongQiang1,XU Xu1,SHAO JianXiong1,LIU ZhaoYuan1,XIAO GuoQing3.ZHANG XiaoAn4,ZHAO YongTao3.ZHANG YanPing3.& CHEN XiMeng1 1 Department of modern physics,{3. University,lanzhou 73.000,china 2 National Key Laboratory of Vacuum & Cryogenics Technology and physics,lanzhou 73.000,china 3.Institute of modern physics,Chinese Academy of Sciences,lanzhou 73.000,china 4 Normal College of Xianyang,Xianyang 713.00,china Department of modern physics Lanzhou University Lanzhou China National Key Laboratory of Vacuum & Cryogenics Technology and physics Lanzhou China Institute of modern physics Chinese Academy of Sciences Lanzhou China Normal College of Xianyang Xianyang China

L-shell X-ray spectra of Mo surface induced by Xe25+ and Xe29+ were measured. The X-ray intensity was obtained in the kinetic energy range of the incident ions from 3.0 to 600 keV. The relationship of X-ray intensity ... 详细信息

关键词： X-ray surface kinetic energy and charge state effect Xeq+

Radiobiological response of human hepatoma and normal liver cells exposed to carbon ions generated by Heavy Ion Research Facility in lanzhou

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Science china(physics,Mechanics & Astronomy) 2006年第1期49卷 72-76页

作者： YANG Jianshe1,2, LI Wenjian1, JIN Xiaodong1, JING Xigang1, GUO Chuanling1, WEI Wei1 & GAO Qingxiang3.1. Institute of modern physics, Chinese Academy of Sciences, lanzhou 73.000, {3. 2. Life Science School of North West Normal University, lanzhou 73.070, {3. 3. Life Science School of lanzhou University, lanzhou 73.000, {3. Institute of modern physics Chinese Academy of Sciences Lanzhou China Life Science School of North West Normal University Lanzhou China Life Science School of lanzhou University Lanzhou China

Human hepatoma and normal liver cells were irradiated with 12C6+ ion beams (LET = 96.05 keV/μm) and γ-rays at Heavy Ion Research Facility in lanzhou (HIRFL). The chromatid breaks and break types were detected using the premature chromosome con- densation technique. Our experimental results showed that chromatid breaks seem to have a good relation with 12C6+ absorbed dose and 12C6+ are more effective to induce chromatid breaks as compared to the γ-rays. For 12C6+ ion irradiation the major break was isochromatid break, while chromatid breaks were dominant for γ-ray irradiation. We also observed that the Relative Biology Effectiveness (RBE) of 12C6+ ion is about 2.5 times higher than that of γ-rays.

关键词： biological response, tumor cell, normal cell, heavy ion HIRFL.

X-ray spectra induced by slow highly charged Ar^(q+) ions in collision with Nb surface

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Science china(physics,Mechanics & Astronomy) 2008年第10期51卷 1463-1469页

作者： YANG ZhiHu1, CUI Ying2, CHEN XiMeng2, SONG ZhangYong1, SHAO JianXiong2, RUAN FangFang1, ZHANG HongQiang2, DU Juan2, LIU YuWen2, GAO ZhiMing2, ZHANG XiaoAn3. ZHU KeXin1, YU DeYang1 & CAI XiaoHong1 1 Institute of modern physics, Chinese Academy of Sciences, lanzhou 73.000, {3. 2 Department of modern physics, lanzhou University, lanzhou 73.000, {3. 3.Department of physics, Xianyang Normal College, Xianyang 712000, {3. Institute of modern physics Chinese Academy of Sciences Lanzhou China Department of modern physics Lanzhou University Lanzhou China Department of physics Xianyang Normal College Xianyang China

The X-ray spectra of Nb surface induced by Arq+ (q =16,17) ions with the energy range from 10 to 20 keV/q were studied by the optical spectrum technology. The experimental results indicate that the multi-electron excitation occurred as a highly charged Ar16+ ion was neutralized below the metal surface. The K shell electron of Ar16+ was excited and then de-excited cascadly to emit K X-ray. The intensity of the X-ray emitted from K shell of the hollow Ar atom decreased with the increase of projectile kinetic energy. The intensity of the X-ray emitted from L shell of the target atom Nb increased with the increase of projectile kinetic energy. The X-ray yield of Ar17+ is three magnitude orders larger than that of Ar16+.

关键词： highly charged ion hollow atom multi-electron X-ray

HIRFL and studies of hot nuclei and nuclei far from stability

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Chinese Science Bulletin 1997年第7期42卷 529-541页

作者： LUO YixiaoInstitute of modern physics, Chinese Academy of Sciences, National Laboratory of Heavy Ion Accelerator of lanzhou, {3., china Institute of modern physics Chinese Academy of Sciences National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China

HEAVY ion physics has been rapidly developing at the limits of energy (nuclear temperature), isospin and spin. Heavy ion research facility of lanzhou (HIRFL) is of cyclotron family delivering intermediate energy heavy ions. During the recent years, progress has been made in the studies of heavy ion physics as well as in the development of the HIRFL. This review article will

关键词： heavy ion accelerator radioactive ion beam hot nuclei nuclei far from stability.

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,{3. 2 {3. Institute of Atomic Energy,Beijing 102413.{3. 3.Center of Theoretical Nuclear physics,National Laboratory of Heavy Ion Research Facility in lanzhou,lanzhou 73.000,{3.) 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 3..0 MeV ≤ S(ρ0) ≤ 3..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

BRST quantization and canonical Ward identity of the supersymmetric electromagnetic interaction system

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Science china(physics,Mechanics & Astronomy) 2007年第3期50卷 339-347页

作者： HUANG YongChang1,3.4, JIANG YunGuo1 & LI XinGuo2,3.1 Institute of Theoretical physics, College of Applied Sciences, Beijing University of Technology, Beijing 100022, china 2 Institute of modern physics, Chinese Academy of Sciences, lanzhou 73.000, china 3.Center of Theoretical Nuclear physics, National Laboratory of Heavy Ion Collisions, Chinese Academy of Sciences, lanzhou 73.000, china 4 china Center of Advanced Science and Technology (World Laboratory), Beijing 100080, china Institute of Theoretical physics College of Applied Sciences Beijing University of Technology Beijing China Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Collisions Chinese Academy of Sciences Lanzhou China china Center of Advanced Science and Technology (World Laboratory) Beijing China Institute of modern physics Chinese Academy of Sciences Lanzhou China

According to the method of path integral quantization for the canonical constrained system in Becchi-Rouet-Stora-Tyutin scheme, the supersymmetric electromagnetic interaction system was quantized. Both the Hamiltonian of the supersymmetric electromagnetic interaction system in phase space and the quantization procedure were simplified. The BRST generator was constructed, and the BRST transforma- tions of supersymmetric fields were gotten; the effective action was calculated, and the generating functional for the Green function was achieved; also, the gauge generator was constructed, and the gauge transformation of the system was ob- tained. Finally, the Ward-Takahashi identities based on the canonical Noether theorem were calculated, and two relations between proper vertices and propaga- tors were obtained.

关键词： supersymmetric electromagnetic interaction BRST quantization Ward identity

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, {3. 2 Center of Theoretical Nuclear physics, National Laboratory of Heavy Ion Research Facility in lanzhou,lanzhou 73.000, {3. 3.Graduate School of Chinese Academy of Sciences, Beijing 100049, {3.) 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

Rem-meter correction factor for measuring high energyneutrons outside concrete shielding

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Nuclear Science and Techniques 1998年第2期9卷 109-112页

作者： Li Gui-Sheng (Institute of modern physics, the Chinese Academy of Sciences, lanzhou 73.000) Inititute of modern physics Chinese Academy of Sciences Lanzhou 730000 China

Correction factors of both Rem-meters, the 10 inch diameter single-sphere Remmeter and the standard A-B Rem-meter, were estimated for measuring high energy neutron dose equivalent outside a concrete shielding wall and the effects that the emitted neutron spectra become remarkably "harder" penetrated through a concrete shielding wall, and the energy response of the Rem-meter were taken in account. The estimated results could be applied in the measurement of neutron dose equivalent for the intermediate energy heavy ion reactions to avoid the difficulty induced by the energy response of the Rem-meters.

关键词：高能中子混凝土屏蔽雷姆米修正因子