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Enhancement in Energy Loss of MeV Silicon Clusters in C Films

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Chinese Physics Letters 2001年第4期18卷 525-527页

作者： SHEN Yi-xiong JIANG Dong-xing lu xi-ting SHEN Ding-Yu Department of Technical Physics and Institute of Heavy Ion Physics Peking UniversityBeijing 100871

Energy losses of 0.63-1.03MeV/atom Sin(n≤3)clusters in thin carbon films(2-12μg/cm^(2))have been measured by using a special experimental setup with Rutherford backscattering(RBS)*** experimental results show that for a given energy per atom,the energy loss of Si^(+)_(2) ions,as well as Si^(+)_(3) ions,is significantly larger than that of Si+*** is the first observation of energy loss enhancement in the measurements with RBS *** enhancement in energy loss(*** cluster effect)is evident when the effective thickness of the carbon target is thin enough,but not evident when it is *** effect will not be obvious until the energy of the projectile is over a certain limit for a special *** suggests that the cluster effect only occurs in the first layers of the target film,and that the energy of the projectile must be large enough for the effect to be seen.

关键词： technique. cluster evident

Identification and Rutherford Backscattering Measurement of MeV Carbon Cluster Ions

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Chinese Physics Letters 1997年第9期14卷 712-714页

作者： WANG Xue-mei lu xi-ting xiA Zong-huang SHEN Ding-yu ZHENG Tao ZHAO Qiang ZHAO Zi-qiang Department of Technicah Physics and Institute of Heavy Ion Physics Peking UniversityBeijing 100871

The MeV carbon cluster ions provided by 1.7 MV tandem accelerator were identified and Rutherford backscattering spectra of MeV carbon cluster ions on the gold film were measured with silicon surface barrier detector.

关键词： cluster film backscattering

Stopping powers for MeV Ge ions in Al foil

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Nuclear Science and Techniques 2000年第2期11卷 109-113页

作者： SHEN Yi-xiong JIANG Dong-xing lu xi-ting xiA Zong-Huang SHEN Ding-Yu(Department of Technical Physics and Institute of Heavy Ion Physics, Peking University,Beijing 100871) Department of Technical Physics and Institute of Heavy Ion Physics Peking UniversityBeijing 100871

Stopping powers for Ge ions (3.5 MeV～8.0 MeV) in Al foil were mea-sured with RBS (Rutherford backscattering) technique and determmed with a new method. Our results are much smaller than the walues predicted by the TR... 详细信息

关键词：铝箔锗离子 RBS 能量损失卢瑟福散射实验研究

Observation of ^(186m)Ta

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Nuclear Science and Techniques 2006年第1期17卷 16-20页

作者： XU Yan-Bing DING Hua-Jie ZHANG Sheng-Dong YUAN Shuang-Gui YANG Wei-Fan lu xi-ting WANG xian-Yi ZHAO Li-Min WANG Ping-Zhi LI Heng-Yuan Institute of Modern Physics the Chinese Academy of Sciences Lanzhou 730000 China China Institute of Atomic Energy Beifing 102413 China School of Physics Peking University Beijing 100871 China

Unreported tantalum isomer 186mTa has been produced through the reaction 186W(n,p) by irradiation of natW with 14 MeV neutrons. The activity of 186mTa and 186Ta was measured using HPGe detectors and several X-γ as well as γ-γ coincidence arrangements. The 186mTa has been identified by means of measuring known γ rays from 186Ta β-decay. The half-life of 186mTa has been determined to be (1.5±0.1) min.

关键词： ^186mTa 中子反应 β衰变钽同分异构体

Fluorine ion transmission through thin biological samples

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Nuclear Science and Techniques 1998年第4期9卷 218-220页

作者： Xue Jian-Ming Wang Yu-Gang lu xi-ting Yan Sha Chen Jiang Zhao Wei-Jiang (Institute of Heavy Ion Physics, Peking Univcrsity, Beijing 100871)

F2+ beam with 3 MeV is used to irradiate thin biological samples (onion innersurface membrane and kidney beau coat) in the transmission measurement, its current densityis 400-800 nA/cm2. Results show that the onion samples can be broken up quickly under ionirradiating; as to kidney beau samples, about 60% of tile implanted ions penetrate the samples,most of them lose part of their energy, fewer ions are found to be able to transmit throughthe sample without energy loss. SEM experiments are carried out to study sample’s damageinduced by tile ions irradiation.

关键词：氟离子离子移植生物样品传输测量

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花生藤还田对杂交水稻产量的影响

土壤肥料 2006年第2期 66-67页

作者：刘义明陆廷昔广西防城港市土肥站防城港市上思县土肥站

桂西南水田坡多地少，农民收获春花生时，常造成花生苗堆在屋边路边沤烂，或当柴烧掉，既浪费有机肥源，又影响农村的环境卫生。因此，把花生藤就近村边还田种水稻是一个一举多得的好事。试验的目的是为了摸清花生藤还田对杂交水稻产量... 详细信息

桂西南水田坡多地少，农民收获春花生时，常造成花生苗堆在屋边路边沤烂，或当柴烧掉，既浪费有机肥源，又影响农村的环境卫生。因此，把花生藤就近村边还田种水稻是一个一举多得的好事。试验的目的是为了摸清花生藤还田对杂交水稻产量的影响，为农民进行花生藤还田提供科学指导。

关键词：水稻产量花生藤还田杂交有机肥源环境卫生桂西南春花生农民水田

^(12)C与^(209)Bi反应中Au同位素的产额与Q_(gg)的关系

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原子能科学技术 2010年第5期44卷 513-516页

作者：杨维凡丁华杰袁双贵卢希庭中国科学院近代物理研究所甘肃兰州730000 北京大学物理学院北京100871

用47MeV/u12C离子轰击天然铋靶,通过炮弹和靶核之间的核子转移反应产生Au同位素。使用放射化学方法从大量Bi和复杂反应产物中分离、纯化Au,并制备Au的γ射线测量源。使用HPGe探测器测量放射性Au同位素的γ活性。根据照射结束时Au同位素... 详细信息

用47MeV/u12C离子轰击天然铋靶,通过炮弹和靶核之间的核子转移反应产生Au同位素。使用放射化学方法从大量Bi和复杂反应产物中分离、纯化Au,并制备Au的γ射线测量源。使用HPGe探测器测量放射性Au同位素的γ活性。根据照射结束时Au同位素的活度和其他相关数据,确定每个Au同位素的产生截面。分析发现,缺中子Au同位素的产生截面与Qgg值之间不遵从指数依赖关系,这可用重离子碰撞中的次级过程加以解释。

关键词： 12C Au同位素 Qgg值丰中子和缺中子同位素