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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

Determination of the ^(12.C(p, γ)^(13)N reaction rates fromthe ^(12.C(~7Li,~6He)^(13)N reaction

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Science china(physics,Mechanics & Astronomy) 2010年第4期53卷 658-663页

作者： LI ZhiHong, SU Jun, GUO Bing, LI ZhiChang, BAI XiXiang, LIU JianCheng, LI YunJu, YAN ShengQuan, WANG BaoXiang, WANG YouBao, LIAN Gang, ZENG Sheng, LI ErTao, CHEN YongShou, SHU NengChuan, FAN QiWen & LIU WeiPing china institute of atomic energy, beijing 102413,{2. 1. china institute of atomic energy Beijing 102413 China

The angular distribution of the 12.(7Li,6He)13N reaction at E(7Li) = 44.0 MeV was measured at the HI-13 tandem accelerator of beijing, china. The asymptotic normalization coefficient (ANC) of 13N → 12. + p was derived to be (1.64 ± 0.11) fm-1/2.through the distorted wave Born approximation (DWBA) analysis. The ANC was then used to deduce the astrophysical S (E) factors and reaction rates for the 12.(p,γ)13N direct capture reaction at energies of astrophysical relevance.

关键词： the 12.(7Li 6He)13N reaction DWBA analysis asymptotic normalization coefficient astrophysical S(E)-factor

Peculiar dynamical properties of plutonium hydrides

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Progress in Natural Science:Materials International 2006年第3期16卷 248-254页

作者： MENG Daqiao, ZHU Zhenghe, LUO Deli and JIANG Gang (institute of atomic and Molecular {2., Sichuan University, Chengdu 610065, china National Key Laboratory of Surface {2. and Chemistry, Mianyang 62.907, china) [a]institute of atomic and Molecular {2. Sichuan University Chengdu China [b]National Key Laboratory of Surface physics and Chemistry Mianyang China

In the present work, the structure and spectra of PuH and PuH2.are defined by B3LYP/SDD method, from which the analytic potential energy function of PuH2.is derived. The analysis of quasi-classical molecular reaction dynamics is performed to study the state-state process of Pu(7Fg) + H2.X1∑g+). It is found that the reaction Pu(7Fg)+H2.X1∑g+)→PuH2.X7B1) has no threshold. The simultaneous hydrogenation process of plutonium with the main product of PuH2.is theoretically proved for the first time.

关键词： hydrogenation reaction of plutonium molecular dynamics density functional theory.

HOT DIPPING ALUMINIZED COATING AS HYDROGEN PERMEATION BARRIER

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 435-440页

作者： Z. Y Yao, M. Chini, A. Aiello and G. Benamati (china institute of {2. energy, P.O.Box 2.5-51, beijing 102.l3, china) ( department of physics, University of Trento, 38100 Trento, Italy) ( ENEA CR Brasimone, 40032.Camugnano, Bologna, Italy) china institute of {2. energy department of physics University of Trento ENEA CR Brasimone

The hydrogen permeation experiment of MANET II with hot dipping aluminized coating was performed in temperature range of 573 to 62. K, in gas phase and in liquid Pb-17Li phase. The hydrogen permeation reduction factor (PRF) evaluated in gas phase is 62. at 573 K and 2.0 at 62. K, and in liquid Pb-17Li phase is 2.-45 at 573 K and 12.30 at 62. K. The self-healing of coating is obvious and effective above 673 K. The pressure dependence of permeation flux indicates strong surface contribution. The way of filling hydrogen by continuous flow and/or bubble can increase permeation flux. The result of SEM-EDS shows that the microcrack is on the surface of the wetted part, but not on the not wetted part. The crack is superficial and affects only thin outside layer not penetrate aluminized layer. The surface elemental analysis shows that Al/O atomic ratio changes from 2.3 of not wetted part to about 1 of wetted part. The damage of coating surface seems to be related to the interaction of outside layer with liquid Pb-17Li and thermal stress during heating sample.

关键词： Electroless plating Hydrogen Maraging steel Mechanical permeability

Fast Reactor Technology Development in china Status and Prospects

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工程科学（英文版） 2007年第4期5卷 76-83页

作者： Xu Mi(china institute of {2. energy,P.O.BOX 2.5(34)beijing 102413,china)

china has decided to speed-up the nuclear power *** is programmed that the nuclear power capacity will reach 40 GWe in 2.2. and envisaged 60 GWe and 2.0 GWe in 2.30 and 2.50 *** basic strategy of PWR-FBR matched development with Fast reactor metal fuel closed cycle for a sustainable and quick increasing nuclear energy supply is *** strategy also decided is that the partitioning and transmutation of MA will be realized using fast burner and *** fast reactor engineering development will be divided into three steps:china Experimental Fast Reactor(CEFR 65 MWt/2. MWe),china Prototype/Demonstration Fast Reactor(CPFR/CDFR ≥ 1 500 MWt/600 MWe)and china Demonstration Fast Breeder Reactor(CDFBR 1 000～1 500 MWe).The CEFR is under installation and pre-operation testing with it's first criticality planned in *** design study of CPFR is just started in *** a discussion for the second step is under way to faster the fast reactor development by a larger than 600 MWe CPFR and as a role of CDFR.

关键词： fast reactor development strategy breeder burner china experimental fast reactor

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,{2. 2.Graduate University of Chinese Academy of Sciences, beijing 100049,{2. 3 china institute of atomic energy (CIAE), beijing 102413,{2. 4 Shanghai institute of Applied physics (SINAP), Chinese Academy of Sciences, Shanghai 2.1800,{2. 5 School of physics and State Key Laboratory of {12. physics and Technology, Peking University, beijing 100871,{2. 1. institute of Modern physics (IMP) Chinese Academy of Sciences Lanzhou 730000 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. China Institute of Atomic Energy (CIAE) Beijing 102413 China4. Shanghai Institute of Applied Physics (SINAP) Chinese Academy of Sciences Shanghai 201800 China5. School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 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

Photodissociation/photoionization processes of chlorobromomethane induced by femtosecond laser pulses with pump-probe scheme

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Chinese Science Bulletin 2008年第5期53卷 681-686页

作者： ZHANG Feng1,2. WEI ZhengRong1,2. CAO ZhenZhou1,2. ZHANG ChangHua1,2.& ZHANG Bing1,2.1 State Key Laboratory of Magnetic Resonance and atomic and Molecular physics, Wuhan {2. of physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, china 2.Graduate University of Chinese Academy of Sciences, beijing 100039, china State Key Laboratory of Magnetic Resonance and atomic and Molecular physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan China Graduate University of Chinese Academy of Sciences Beijing China

The photodissociation/photoionization processes of chlorobromomethane (CH_2.rCl) induced by fem- tosecond laser pulses have been investigated using pump-probe scheme combined with the time-of-flight mass spectra. The dominate photoproducts are observed at different delay time of the pump (400 nm) and probe (800 nm) pulses and the corresponding time-dependence of them is obtained. The results show that the decaying time of the molecule CH_2.rCl in the A-band is in the 100 fs. The decaying tendencies of the fragment ions (CH_2.l^+ and CH_2.r^+) and the parent ion (CH_2.rCl^+) are almost the same and the relative ratios of the yields of them keep constant during the delay time of 0 to 150 fs. These facts suggest that the fragment ions come from the fragmentation of the parent ions in excited electronic states. The probabilities to form CH_2.l^+ and CH_2.r^+ are obtained from the relative ratio of the ion intensity and are about 71.6% and 14.2., respectively.

关键词：毫微秒激光氯溴化甲烷激光探针光解作用光化电离作用

A Heavy Ion Focal Plane Detector for beijing Q3D Magnetic Spectrometer

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Chinese journal of nuclear physics 1995年第1期 73-80页

作者： Guo Ji-yu Zhao Kui Li Zhi-chang Lu Xiu-qin Cheng Ye-hao Huang Xiao-lin Li Shu-yuan Ruan Ming Jiang Cheng-lie (department of nuclear {2..china institute of atomic energy,beijing 102413)Chen Yu-hua (department of nuclear Technique,china institute of atomic energy.beijing 102413)

A semi-length focal plane detecting system for heavy ions has been built onthe beijing Q3D magnetic spectrometer and tested by 12.+197Au,16O+150Sm,and 18O-156Gd *** intrinsic resolutions of position and angle were 1.1... 详细信息

A semi-length focal plane detecting system for heavy ions has been built onthe beijing Q3D magnetic spectrometer and tested by 12./sup>C+197Au,16O+150Sm,and 18O-156Gd *** intrinsic resolutions of position and angle were 1.1 mmand 0.8°,*** resolutions of energy loss ΔE,residual energy ER and totalenergy ET obtained were 3.0%,1.4% and 0.9%.respectively,after a special method ofdata processing was *** achievable mass resolution is estimated to be about1.0% after necessary corrections for some signals *** aboul the edgeeffect of the detectors of this type is given too.

关键词： Heavy ion Q3D Focal plane detector Resolution Edge effect

The feature study on the π and proton rapidity distributions at AGS, SPS and RHIC

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Science china(physics,Mechanics & Astronomy) 2009年第2期52卷 198-206页

作者： FENG ShengQin1,2.& YUAN XianBao1,3 1 College of Science, china Three Gorges University, Yichang 443002. china 2.School of {2. and Technology, Wuhan University, Wuhan 430072. china 3 institute of Particle {2., Central china Normal University, Wuhan 430070, china 1. College of Science China Three Gorges University Yichang 443002 China 2. School of physics and Technology Wuhan University Wuhan 430072 China 3. institute of Particle physics Central China Normal University Wuhan 430070 China

The features of nuclear stopping power and multi-hadron production systematically are studied by making an analysis of rapidity distributions of pion and proton at AGS, SPS and RHIC in this work. It is found that nuclear stopping power increases linearly with project rapidity yp at AGS and SPS, but that is not liner at RHIC. It is argued that the average rapidity loss is saturated at central rapidity region at RHIC. For pion distribution, it is found that the phase space of pion distribution distributes uniformly in the longitudinal direction,and a linear relationship of L with log s is given at AGS and SPS. Non-uniform flow model may explain the features of the distribution at AGS and SPS, but may not ex- plain those of at RHIC.

关键词： non-uniform flow model average rapidity loss baryon number density nuclear stopping power