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Structural and mechanical properties of amorphous carbon films deposited by the dual plasma technique

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Journal of university of Science and technology beijing 2008年第5期15卷 622-626页

作者： Yaohui Wang,Xu zhang,Xianying Wu,Huixing zhang,and Xiaoji zhang key laboratory of the ministry of education of china for beam technology and material modification,Institution of low energy nuclear physics,beijing normal university beijing Radiation Center,beijing 100875,china key laboratory of the ministry of education of china for beam technology and material modification Institution of Low Energy Nuclear Physics Beijing Normal University beijing Radiation Center Beijing 100875 China

Direct current metal filtered cathodic vacuum arc （FCVA） and acetylene gas （C2H2） were wielded to synthesize Ti-containing amorphous carbon films on Si （100）. The influence of substrate bias voltage and acetylene gas on the microstructure and mechanical properties of the films were investigated. The results show that the phase of TiC in the （111） preferential crystallographic orientation exists in the film,and the main existing pattern of carbon is sp2. With increasing the acetylene flow rate,the contents of Ti and TiC phase of the film gradually reduce; however,the thickness of the film increases. When the substrate bias voltage reaches -600 V,the internal stress of the film reaches 1.6 GPa. The micro-hardness and elastic modulus of the film can reach 33.9 and 237.6 GPa,respectively,and the friction coefficient of the film is 0.25.

关键词： metal containing amorphous carbon amorphous carbon films filtered arc acetylene flow rate bias voltage structure and properties

Collision dynamics of He@C_(60)+He@C_(60) at low energies

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Science china(physics,Mechanics & Astronomy) 2008年第7期51卷 765-772页

作者： ZHAO Qiang1,2, zhang FengShou1,2,3 & ZHOU HongYu1,2 1 key laboratory of beam technology and material modification of ministry of education, institute of low energy nuclear physics, beijing normal university, beijing 100875, china 2 beijing Radiation Center, beijing 100875, china 3 Center of Theoretical nuclear physics, National laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, china key laboratory of beam technology and material modification of ministry of education Institute of Low Energy Nuclear Physics Beijing Normal University Beijing China beijing Radiation Center Beijing China Center of Theoretical nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China

A semi-empirical molecular dynamics model is developed. The central collisions of C60+C60 and He@C60+He@C60 at different incident energies are investigated based on this model. It is found that the dimer structures have been produced at proper incident energies and these fullerene dimers could be formed by a self-assembly of C60 fullerene and He@C60. The He atom has a significant effect at higher incident energy and this embedded He atom can enhance the stability of the dimer structure.

关键词： C60 He@C60 collision molecular dynamics

Complete multiple round quantum dense coding with quantum logical network

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Chinese Science Bulletin 2007年第9期52卷 1162-1165页

作者： LI ChunYan1,2,LI XiHan1,2,DENG FuGuo1,2,3,ZHOU Ping1,2 & ZHOU HongYu1,2,3 1 key laboratory of beam technology and material modification of ministry of education,beijing normal university,beijing 100875,china 2 institute of low energy nuclear physics,and Department of material Science and Engineering,beijing normal university,beijing 100875,china 3 beijing Radiation Center,beijing 100875,china key laboratory of beam technology and material modification of ministry of education Beijing Normal University Beijing China institute of low energy nuclear physics and Department of Material Science and Engineering Beijing Normal University Beijing China beijing Radiation Center Beijing China

We present a complete multiple round quantum dense coding scheme for improving the source ca-pacity of that introduced recently by zhang et al. The receiver resorts to two qubits for storing the four local unitary ope... 详细信息

关键词：量子通信多重量子紧凑编码量子逻辑网络量子纠缠

Shell effect and capture cross sections in the synthesis of superheavy nuclei

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Science china(physics,Mechanics & Astronomy) 2009年第10期52卷 1489-1493页

作者： DU SaiSai1,2,BIAN BaoAn1,2,3,LIU Min1,2,4,FENG ZhaoQing5,6 & zhang FengShou1,2,6 1 key laboratory of beam technology and material modification of ministry of education,College of nuclear Science and technology,beijing normal university,beijing 100875,china 2 beijing Radiation Center,beijing 100875,china 3 School of Science,Jiangnan university,Wuxi 214122,china 4 College of physics and technology,Guangxi normal university,Guilin 541004,china 5 institute of Modern physics,Chinese Academy of Sciences,Lanzhou 730000,china 6 Center of Theoretical nuclear physics,National laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000,china key laboratory of beam technology and material modification of ministry of education College of Nuclear Science and Technology Beijing Normal University Beijing China beijing Radiation Center Beijing China School of Science Jiangnan University Wuxi China College of physics and technology Guangxi Normal University Guilin China institute of Modern physics Chinese Academy of Sciences Lanzhou China Center of Theoretical nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China

The shell effect is included in the improved isospin dependent quantum molecular dynamics model in which the shell correction energy of the system is calculated by using the deformed two-center shell model. A switch function is introduced to connect the shell correction energy of the projectile and the target with that of the compound nucleus during the dynamical fusion process. It is found that the calculated capture cross sections reproduce the experimental data quantitatively at the energy near the Coulomb barrier. The capture cross sections for reaction 35 80 Br + 82 208 Pb → 117 288 X are also calculated and discussed.

关键词： superheavy nuclei transport theory shell effect cross sections

Direct measurement of the break-out ^(19)F(p,γ)^(20)Ne reaction in the china Jinping underground laboratory(CJPL)

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nuclear Science and Techniques 2024年第8期35卷 142-152页

作者： Yin‑Ji Chen Hao zhang Li‑Yong zhang Jian‑Jun He Richard James deBoer Michael Wiescher Alexander Heger David Kahl Jun Su Daniel Odell Xin‑Yue Li Jian‑Guo Wang Long zhang Fu‑Qiang Cao Zhi‑Cheng zhang Xin‑Zhi Jiang Luo‑Huan Wang Zi‑Ming Li Lu‑Yang Song Liang‑Ting Sun Qi Wu Jia‑Qing Li Bao‑Qun Cui Li‑Hua Chen Rui‑Gang Ma Er‑tao Li Gang Lian Yao‑De Sheng Zhi‑Hong Li Bing Guo Wei‑Ping Liu key laboratory of beam technology of the ministry of education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of physics and Astronomy The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of physics and Astronomy Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope beams Michigan State UniversityEast LansingMI 48824USA institute of nuclear and Particle physics and Department of physics and Astronomy Ohio UniversityAthensOH 45701USA institute of Modern physics Chinese Academy of SciencesLanzhou 730000China china institute of Atomic energy Beijing 102413China College of physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of nuclear Science and technology University of Chinese Academy of SciencesBeijing 100049China College of Science Southern University of Science and TechnologyShenzhen 518055China institute of Radiation technology Beijing Academy of Science and TechnologyBeijing 100875China key laboratory of nuclear physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mathematics and physics Handan UniversityHandan 056005China

Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in *** one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest ***,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out ^(19)F(p,γ)^(20) Ne reaction with respect to the competing ^(19)F(p,α)^(16) O back-processing reaction is required to reproduce the observed calcium *** performed a direct measurement of this break-out reaction at the china Jinping underground *** measurement was performed down to the low-energy limit of E_(c.m.)=186 keV in the center-of-mass *** key resonance was observed at 225.2 keV for the first *** a temperature of approximately 0.1 GK,this new resonance enhanced the thermonuclear ^(19)F(p,γ)^(20) Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE *** is of particular interest to the study of the evolution of the first stars and implies a stronger breakdown in their“warm”CNO cycle through the ^(19)F(p,γ)^(20) Ne reaction than previously *** break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars.

关键词： nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate china Jinping underground laboratory(CJPL) JUNA

Fusion and one-neutron stripping process for ^(6)Li+^(94)Zr system around the Coulomb Barrier

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Chinese physics C 2024年第9期48卷 133-141页

作者： Xuedou Su Guangxin zhang Shipeng Hu Peiwei Wen H.O.Soler Gaolong zhang Boshuai Cai Cenxi Yuan J.L.Ferreira Zhenwei Jiao Mingli Wang Xiaoyu Wang Zhen Huang Huanqiao zhang Chunlei zhang Xiaoguang Wu Yun Zheng Congbo Li Tianxiao Liand J.Lubian School of physics Beihang UniversityBeijing 100191China Sino-French institute of nuclear Engineering and technology Sun Yat-sen UniversityZhuhai 519082China institute for Advanced Study in nuclear energy&Safety Shenzhen UniversityShenzhen 518060China Shenzhen key laboratory of Research and Manufacture of High Purity Germanium materials and Fetectors Shenzhen UniversityShenzhen 518060China china institute of Atomic energy Beijing 102413China Instituto de Física Universidade Federal FluminenseNiterói 24210-340Rio de JaneiroBrazil State key laboratory of Radiation Medicine and Protection School of Radiation Medicine and ProtectionSoochow UniversitySuzhou 215123China The key laboratory of beam technology and material modification of ministry of education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China

The complete and incomplete fusion cross section as well as one-neutron stripping process of ^(6)Li+^(94)Zr system were measured at the energies around the Coulomb barrier by onlineγ-ray *** addition to a 30%suppression factor when compared with the measured total fusion process,the complete fusion cross section in ^(6)Li+^(94)Zr system was observed to be significantly lower than those in the nearby ^(6)Li+^(90,96)Zr *** new experimental result implies that the coupling with breakup channel in the ^(6)Li-induced fusion processes can be affected by the inner structure of the target,which is still not clear in any available model *** the one-neutron stripping process,the direct production cross sections for each level in 95Zr were extracted and compared with the coupled reaction channel calculation,offering a unique opportunity to examine the single-particle nature of the produced excited *** the fact that an overall overestimation of the production cross section for 954-keV and1618-keV levels was observed in the comparison,further investigation is highly demanded in order to understand the full reaction mechanism for the one-neutron stripping process induced by ^(6)Li.

关键词： weakly bound nuclei complete fusion incomplete fusion transfer reaction

Calculation of electron wave functions and refractive index of Ne

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Science china(physics,Mechanics & Astronomy) 2008年第10期51卷 1489-1495页

作者： ZHU Min LIU Wei zhang tao key laboratory of beam technology and material modification of ministry of education in beijing normal university Institute of Low Energy Nuclear PhysicsBeijing Radiation CenterBeijing 100875China

The radial wave functions of inner electron shell and outer electron shell of a Ne atom were obtained by the approximate analytical method and tested by calculating the ground state energy of the Ne atom. The equivalent volume of electron cloud and the refractive index of Ne were calculated. The calculated refractive index agrees well with the experimental result. Relationship between the refractive index and the wave function of Ne was discovered.

关键词： electron cloud refractive index density function theory (DFT) Slater radial wave function (STO) variation calculus

In situ luminescence measurements of GaN/Al_(2)O_(3) film under different energy proton irradiations

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Chinese physics B 2024年第5期33卷 704-710页

作者：蒋文丽欧阳潇仇猛淋英敏菊陈琳庞盼张春雷张耀锋廖斌 key laboratory of beam technology of ministry of education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China institute of Radiation technology Beijing Academy of Science and TechnologyBeijing 100875China

Ion beam-induced luminescence(IBIL) experiments were performed to investigate the in situ luminescence of GaN/Al_(2)O_(3) at varying ion energies,which allowed for the measurement of defects at different depths within the *** energies of H^(+)were set to 500 keV,640 keV and 2 MeV,the Bragg peaks of which correspond to the GaN film,GaN/Al_(2)O_(3) heterojunction and Al_(2)O_(3) substrate,respectively.A photoluminescence measurement at 250 K was also performed for comparison,during which only near band edge(NBE) and yellow band luminescence in the GaN film were *** evolution of the luminescence of the NBE and yellow band in the GaN film was discussed,and both exhibited a decrease with the fluence of H^(+).Additionally,the luminescence of F centers,induced by oxygen vacancies,and Cr^(3+),resulting from the ^(2)E →^(4)A_(2) radiative transition in Al_(2)O_(3),were measured using 2 MeV H^(+).The luminescence intensity of F centers increases gradually with the fluence of H^(+).The luminescence evolution of Cr^(3+)is consistent with a yellow band center,attributed to its weak intensity,and it is situated within the emission band of the yellow band in the GaN *** results show that IBIL measurement can effectively detect the luminescence behavior of multilayer films by adjusting the ion *** measurement can be excited by various techniques,but IBIL can satisfy in situ luminescence measurement,and multilayer structural materials of tens of micrometers can be measured through IBIL by adjusting the energy of the inducing *** evolution of defects at different layers with ion fluence can be obtained.

关键词： ion beam-induced luminescence(IBIL) GaN/Al_(2)O_(3) ion beam

One-neutron stripping process in the^(209)Bi(^(6)Li,^(5)Li)^(210)Bi*reaction reaction

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nuclear Science and Techniques 2024年第6期35卷 120-129页

作者： Gao-Long zhang Zhen-Wei Jiao Guang-Xin zhang E.N.Cardozo B.Paes Shi-Peng Hu Jian-Qiang Qian Daniele Mengoni Wei-Wei Qu Cong-Bo Li Yun Zheng Huan-Qiao zhang Hui-Bin Sun Nan Wang Chun-Lei zhang J.J.Valiente-Dobón D.Testov M.Mazzocco A.Gozzelino C.Parascandolo D.Pierroutsakou M.La Commara A.Goasduff D.Bazzacco D.R.Napoli F.Galtarossa F.Recchia A.Illana S.Bakes I.Zanon S.Aydin Gde Angelis M.Siciliano R.Menegazzo S.M.Lenzi S.Akkoyun L.F.Canto J.Lubian School of physics Beihang UniversityBeijing 100191China Sino-French institute of nuclear Engineering and technology Sun Yat-Sen UniversityZhuhai 519082China Instituto de Física Universidade Federal Fluminense24210-340 NiteróiRio de JaneiroBrazil Laboratorio TANDAR Comisión Nacional de Energía AtómicaBKNA1650 San MartíınArgentina institute for Advanced Study in nuclear energy and Safety Shenzhen UniversityShenzhen 518060China Shenzhen key laboratory of Research and Manufacture of High Purity Germanium materials and Fetectors Shenzhen UniversityShenzhen 518060China INFN Sezione di PadovaPaduaItaly Dipartimento di fisica Astronomia dell’Universita di padova PaduaItaly State key laboratory of Radiation Medicine and Protection School of Radiation Medicine and ProtectionSoochow UniversitySuzhou 215123China china institute of Atomic energy Beijing 102413China The key laboratory of beam technology and material modification of ministry of education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Laboratori Nazionali di Legnaro INFN35020 LegnaroItaly INFN Sezione di Napoli80126 NaplesItaly Dipartimento di Farmacia Universitàdi Napoli“Federico II”80131 NaplesItaly Department of Natural and Mathematical Sciences Faculty of EngineeringTarsus University33480 MersinTurkey physics Division Argonne National LaboratoryLemontILUSA Department of physics Sivas Cumhuriyet UniversitySivasTurkey Instituto de Física Universidade Federal do Rio de JaneiroRio de Janeiro CP 6852821941-972Brazil

One-neutron stripping process between^(6)Li and^(209)Bi was studied at 28,30,and 34 MeV using the in-beamγ-ray spectroscopy ***γ-γcoincident analysis clearly identified twoγ-rays feeding the ground and long-lived isomeric states,which were employed to determine the cross *** one-neutron stripping cross sections were similar to the cross sections of complete fusion in the^(6)Li+^(209)Bi system,but the one-neutron stripping cross sections decreased more gradually at the sub-barrier region.A coupled-reaction-channel calculation was performed to study the detailed reaction mechanism of the one-neutron stripping process in^(6)*** calculations indicated that the first excited state of 5 Li is critical in the actual one-neutron transfer mechanism,and the valence proton of 209Bi can be excited to the low-lying excited state in(^(6)Li,^(5)Li)reaction,unlike in the(d,p)reaction.

关键词： Transfer reaction Weakly bound nuclei Cross section