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

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 {2. and Technology,beijing normal university,beijing 100875,China 2.beijing Radiation Center,beijing 100875,China 3 School of {2.,Jiangnan university,Wuxi 2.412.,China 4 College of physics and Technology,Guangxi normal university,Guilin 541004,China 5 {12. of Modern physics,Chinese Academy of {2.s,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 100875 China beijing Radiation Center Beijing 100875 China School of science Jiangnan University Wuxi 214122 China College of physics and Technology Guangxi Normal University Guilin 541004 China institute of Modern physics Chinese Academy of Sciences Lanzhou 730000 China Center of Theoretical nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 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 + 82.2.8 Pb → 117 2.8 X are also calculated and discussed.

关键词： superheavy nuclei transport theory shell effect cross sections

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Fuzzy cluster analysis of the provenance of ancient Yaozhou porcelain body

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Chinese science Bulletin 2003年第1期48卷 27-30页

作者： LI Guoxia1, ZHAO Weijuan1, LI Rongwu2. XIE Jianzhong1, FENG Songlin3, FAN Dongyu3, ZHANG Ying3, CAI Zhifang3, ZHUO Zhenxi4 & GAO Zhengyao1 1. Faculty of Physical engineering, Zhengzhou university, Zhengzhou 450052. China 2. {2. of physics, beijing normal university, beijing 100875, China 3. High energy physics institute, the Chinese Academy of sciences, beijing 100080, China 4. Archaeology Research institute, Shanxi Province, Xian 710000, China Correspondence should be addressed to Li Guoxia (e-mail: Liguoxia@ ***) Faculty of Physical engineering Zhengzhou University Zhengzhou 450052 China department of physics Beijing Normal University Beijing 100875 China High energy physics {2. Chinese Academy of Sciences Beijing 100080 China Archaeology Research institute Shanxi Province Xi'an 710000 China

The technique of neutron activation analysis (NAA) has been employed to measure the content of 2. kinds of elements in the sample of Yaozhou porcelain bodies. Then a fuzzy cluster analysis has been conducted to the NAA data and a diagram of the dynamic fuzzy cluster analysis has been achieved. The results indicate that the batch of ancient Yaozhou porcelain bodies, which were of different overglaze color and were produced by different kilns during a period of over 800 years from the Tang Dynasty (618—907 A.D.) to the Yuan Dynasty (12.1—1368 A.D.), has shared a stable and concentrated raw material source. Provenances of por-celain bodies from different times, though having their spe-cific independence, enjoy a close relationship and are not far from one another. Provenances of porcelain bodies made during the Tang Dynasty and the Five Dynasties (907—960 A.D.) are found to be closer to one another, while those of the Song (960—12.9 A.D.) and the Jin Dynasty (1115—12.4 A.D.) are comparatively concentrated in certain areas and are dif-ferent from those of the Tang Dynasty. Both the tri-colored glazed pottery made in Yaozhou kilns during the Tang Dy-nasty and the Yaozhou porcelain bodies of the Tang period are from the same provenance.

关键词：古代姚州瓷胎窑址粘土矿原料来源中子活化分布模糊聚类分析

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XMM-Newton observation of the eclipsing binary Algol

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Research in Astronomy and Astrophysics 2011年第4期11卷 457-470页

作者： Xue-Juan Yang Fang-Jun Lu Bemd Aschenbach Li Chen Faculty of materials Optoelectronics and Physics Xiangtan University Xiangtan 411105China Particle Astrophysics Center Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Max-Planck-Institut fur Extraterrestrische Physik 85741 Garching Germany department of Astronomy Beijing Normal University Beijing 100875 China

We present an XMM-Newton observation of the eclipsing binary Algol which contains an X-ray dark B8V primary and an X-ray bright K2.V secondary. The observation covered the optical secondary eclipse and captured an X-ray flare that was eclipsed by the B star. The XMM-Newton European Photon Imaging Camera and Reflection Grating Spectrometer spectra of Algol in its quiescent state are described by a two-temperature plasma model. The cool component has a temperature around 6.4× 106 K while that of the hot component ranges from 2.to 4.0× 107 K. Coronal abundances of C, N, O, Ne, Mg, Si and Fe were obtained for each component for both the quiescent and the flare phases, generally with upper limits for S and Ar, and upper limits for C, N, and O from the hot component. F-tests show that the abundances do not need to be different between the cool and the hot component and between the quiescent and the flare phase with the exception of Fe. Although the Fe abundance of the cool component remains constant at -0.14, the hot component shows an Fe abundance of -0.2., which increases to -0.44 during the flare. This increase is expected from the chromospheric evaporation model. The absorbing column density NH of the quiescent emission is 2.5 - 102. cm-2. while that of the flare-only emission is significantly lower and consistent with the column density of the interstellar medium. This observation substantiates earlier suggestions of the presence of X-ray absorbing material in the Algol system.

关键词： stars abundance -- star binaries eclipsing -- stars flare -- stars indi-vidual Algol

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Long range implantation by MEVVA metal ion source

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nuclear science and Techniques 2001年第1期12卷 16-20页

作者： ZHANG Tong-He WU Yu-Guang MA Fu-Rong LIANG Hong (Key Laboratory in university for Radiation Beam Technology and material modification, {2. of low energy nuclear physics, beijing normal university beijing Radiation Center, beijing 100875) Key Laboratory in university for Radiation Beam Technology and material modification Instituteof Low Energy Nuclear Physics Beijing Normal University beijing Radiation Center

Metal vapor vacuum arc (MEVVA) source ion implantation is a new technology used for achieving long range ion *** is very important for research and application of the ion beammodification of materials. The results showthat the implanted atom diffusion coefficient increases in Mo implanted Al with high ion flux andhigh dose. The implanted depth is 311.6 times greater than that ofthe corresponding ion range. The ionspecies, doses and ion fluxes play an important part in the long-range implantation. Especially,thermal atom chemistry have specific effect on the long-range implantation during high ion fluximplantation at transient high target temperature.

关键词： MEVVA离子源离子移植扩散技术

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Composition and structure of ceramic coatings prepared on pure titanium by alternating-current microarc oxidation

Composition and structure of ceramic coatings prepared on pu...

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International Symposium of Young Scholars on Mechanics and material engineering for {2. and Experiments

作者： Wenbin Xue11^ Chao Wang1 U] Ruyi ChenI1>2. Zhiwei Deng Yongchun Lai Key Laboratory for Radiation Beam Technology and materials Modification institute of {2. {2. nuclear physics beijing normal university) beijing 100875 China m beijing Radiation Center beijing 100875 China Key Laboratory for Radiation Beam Technology and materials Modification Institute of Low Energy Nuclear Physics Beijing Normal University Beijing 100875 China

ISBN: (纸本)1880132796

＜正＞ A ceramic oxide coating of 30μm was prepared on TA2.pure titanium by alternating-current microarc oxidation in aluminate solution. Its microstructure and phase component were characterized by scanning electron microscopy, X-ray diffractometry, Raman spectroscopy. The Al, Ti, O concentration profiles across the coating were determined by energy dispersive spectroscope. The coating contains two layers, an outer layer and an internal layer. The outer layer is composed of a large amount of TiAl2.5 and a little rutile type TiO2.compounds. But the rutile content in the inner layer is much higher than in the outer layer while the TiAl2.5 content decreases obviously in the inner layer. All of these oxides derive from a rapid solidification of the local molten coating in microarc discharge zone.

关键词： Microarc oxidation pure titanium phase structure ceramic coating

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Penetration depth and concentration distribution for implanted heavy ions with low energies in plant seeds by SEM and EDS

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nuclear science and Techniques 2001年第1期12卷 26-31页

作者： WANG Xin-Fu ZHOU Yun-Long ZHOU Hong-Yu LU Ting Wang Chao SU Ying ZHU Guang-Hua WEN Chen-Lin LI Yong-Liang (Key Laboratory for Beam Technology and material Modification of Ministry of Education, institute of {2. {2. nuclear physics, beijing Norm Key Laboratory for Beam Technology and material Modificationof Ministry of Education Institute of Low Energy Nuclear PhysicsBeijing Normal University beijing Radiation Center department of Biology Beijing Normal University Center for Analysis and Testing Beijing Normal University

The penetration depth and concentration distribution of implanted ions have been studied for low energy heavy ions implanted in the dry seeds of plant, such as peanut, mung beau, sunflower, wheat and radish seeds, etc. by SEM+EDS. The results .how that the maximum penetration depth is about 12.m for V+ with an energy 2.0 keV implanted in cotyledon of the peanut, 18pm, spin, 2.μm for V2. with 90 keV implanted in sunflower, wheat, radish seeds, respectively. The penetration depth of implanted Cu2. with 80 keV is about 90μm in the remainder funicle derivative of the mung beau seeds. The experimental result of the maximum penetration depth of implanted V+ in the peanut seeds was compared with the calculated value of the TRIM95.

关键词：离子移植渗透深度浓度分布植物种子

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