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β-delayed proton decays near the proton drip line

Science china(Physics,Mechanics & Astronomy) 2005年第3期48卷 257-267页

作者： XU Shuwei 1 , LI Zhankui 1 , XIE Yuanxiang 1 , HUANG Wenxue 1 , SHU Nengchuan 2 , CHEN Yongshou 2 , XU Furong 3 , WANG Kun 4., PAN Qiangyan 1 , WANG Xudong 1 , YU Yong 1 & XING Yebing 1 1. institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, china 2. nuclear Physics Department, china institute of Atomic Energy, Beijing 1024.3, china 3. Department of Technical Physics, Peking University, Beijing 100871, china 4. shanghai institute for nuclear research, shanghai 201800, china 1. institute of Modern Physics Chinese Academy of Sciences 730000 Lanzhou China 2. nuclear Physics Department China Institute of Atomic Energy 102413 Beijing China 3. Department of Technical Physics Peking University 100871 Beijing China 4. shanghai institute for nuclear research 201800 Shanghai China

We briefly reviewed the experimental study on a-delayed proton decays near the proton drip line published by our group during the period of 1996―2004. namely the first observation of the a-delayed proton decays of 9 new nuclides in the rare-earth region and the new measurements of a-delayed proton decays of 5 nuclides in the mass ～90 region near the N = Z line with the aid of the “p-?” coincidence in combination with a He-jet tape transport system. In the meantime some important experimental technique details were supplemented. The experimental results, including the half -lives, spins, parities, deformations and production reaction cross sections for the 14.nuclei were summarized and compared with the current nuclear-model predictions, and then the following points were represented. (1) The experimental half-lives for 85Mo and 92Rh as well as the predicted “waiting point” nuclei 89Ru and 93Pd are 5―10 times longer than the theoretical predictions given by M?ller et al. using a macroscopic-microscopic model. It considerably influences the predictions of the abundances of the nuclides produced in the rp-process. (2) The current-model predictions are not consistent with the experimental assignments of the spins and parities for the proton drip-line nuclei 14.Ho and 128Pm. However, the nuclear potential energy surface (PES) calculated by using a Woods- Saxon-Strutinsky method reproduced the experimental results. (3) The Alice code overestimated the production reaction cross sections of the studied 9 rare-earth nuclei by one order of magnitude or two, while HIVAP code overestimated them by one order of magnitude approximately.

关键词： proton drip line, β-delayed proton decay, He-jet tape transport system, "p-γ" coincidence, spin, parity, deformation, production reaction cross section.

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Productions of kaon and lambda by 50 GeV protons incident on nuclear targets

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nuclear Science and Techniques 1998年第2期9卷 74-77页

作者： Xu Xiao-Ming (shanghai institute of nuclear research, the Chinese Academy of Sciences,{4.) shanghai institute of nuclear research Chinese Academy of Sciences Shanghai 201800 China

A Glauber multiple scattering theory in terms of pations and nucleons is applied to study productions of kaon, lambda and antilambda ill 50 GeV proton-nucleus scatterings at JHF (the Japan Hadron Facility). Tile ratios of tile differential cross sections of nucleontungsten to nucleon-beryllium are calclutated versus the transverse momentum at central rapidity. The cancellation between the single and double scattering amplitudes leads to nuclear enhancement of strangeness production at central rapidity.

关键词：质子核子靶 K介子 Α粒子

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Regular behaviors in SU(2) Yang-Mills classical mechanics

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nuclear Science and Techniques 1997年第3期8卷 139-143页

作者： Xu Xiao Ming (shanghai institute of nuclear research, the Chinese Academy of Sciences,{4.) shanghaiinstituteofnuclearresearch theChineseAcademyofSciencesShanghai201800

ＲｅｇｕｌａｒｂｅｈａｖｉｏｒｓｉｎＳＵ（２）ＹａｎｇＭｉｌｓｃｌａｓｉｃａｌｍｅｃｈａｎｉｃｓＸｕＸｉａｏＭｉｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＮｕｃｌｅａｒＲｅｓｅａｒｃｈ，ｔｈｅＣｈｉｎｅｓｅＡ... 详细信息

ＲｅｇｕｌａｒｂｅｈａｖｉｏｒｓｉｎＳＵ（２）ＹａｎｇＭｉｌｓｃｌａｓｉｃａｌｍｅｃｈａｎｉｃｓＸｕＸｉａｏＭｉｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＮｕｃｌｅａｒＲｅｓｅａｒｃｈ，ｔｈｅＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，...

关键词： SU(2) 杨-Mills经典力学正则行为

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Filtering-efficiency measurement of Chinese-made filter 1by double-filter method

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nuclear Science and Techniques 1999年第3期10卷 168-170页

作者： ZHI Min (shanghai institute of nuclear Rcsearrh, the Chinese Academy of Sciences, shanghai 201800) shanghai institute of nuclear research Chinese Academy of sciences Shanghai 201800 China

Filtering efficiency of the Chinese-made filter 1 has been measured by the double-filter method with only one set of measurement equipment. The β counts of the two filters are measured in turn for every 3 minutes, from which the decay constants are extracted to be 0.0131 min-1 and 0.0129 min-1 for the first and second filter respectively. After correcting the β counts of the second filter, the filtering efficiency of the filter is obtained to be (87.4.0.7)% in average.

关键词：滤波器双重滤波方法滤波效率

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Photolysis of benzophenone with two-step two-laser excitation

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Science china Chemistry 2001年第6期44卷 582-586页

作者： CAI Xichen HAN Zhenhui , YAO Side& LIN NianyunLaboratory of Radiation Chemistry, shanghai institute of nuclear research, Chinese Academy of Sciences,{4., china 1. Laboratory of Radiation Chemistry Shanghai Institute of Nuclear Research Chinese Academy of Sciences 201800 Shanghai China

The first laser excites a molecule to a lower triplet state and another sequential laser excites it resonantly to higher triplet states or makes it ionization. This two-step two-laser method provides a novel way to study the electron transfer or charge transfer of excited molecules. The higher excited benzophenone and its radical cation can be observed under the time-resolved absorption method when it was excited to lower triplet state by one laser and another one exciting it to higher triplet states resonantly. The higher excited benzophenone molecules undergoing inter-molecular hydrogen abstraction with iso-propylalcohol molecules are faster than the lower ones.

关键词： two-laser photolysis upper triplet states benzophenone

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Simulation of Isotopic Angular Effects under Ion Bombardment of a^(92)Mo-^(100)Mo Target

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Journal of Materials Science & Technology 1997年第1期13卷 65-68页

作者： Liping ZHENG (shanghai institute of nuclear research, Chinese Academy of Sciences,{4., china)Risheng LI and Shuyou LI(Lab. of Atomic Imaging of Solids, institute of Metal research, Chinese Academy of Sciences,Shenyang 110015, china) shanghai institute of nuclear research Chinese Academy of Sciences Shanghai 201800 China Lab. of Atomic Imaging of Solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Under 5 keV Ar ion bombardment of a 92Mo-100Mo target, we have investigated isotopic angular effects by means of the static and the dynamic Monte Carlo programs. Our calculated results are in quantitative agreement with the measured and other calculated results. The conclusion consistences among theories. simulations and measurements are also discussed.

关键词： Mo Target Simulation of Isotopic Angular Effects under Ion Bombardment of a Target

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Critical phenomena of a nuclear system in alternative ZM models

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nuclear Science and Techniques 2000年第3期11卷 173-178页

作者： SONG Hong-Qiu (research Center of nuclear Theory of National Laboratory Of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000 shanghai institute of nuclear research, the Chinese Academy of Sciences, shanghai 201800) 兰州原子核理论研究中心重离子加速器国家实验室甘肃兰州 730000

Alternative versions of the ZM model are extended to asymmetric nuclear matter by including p meson degree of freedom in the Lagrangian. The extended models are then used to study the thermodynamical properties of asymmetric nuclear matter at finite temperature. The critical temperature for a liquid- gas phase transition in nuclear matter and its dependence on asymmetry parameter are calculated. The limiting temperature Tlim, which reflects Coulomb instability of hot nuclei, is studied. The calculated results are compared with that given by the original ZM model.

关键词：放射性核素临界现象 ZM模型固气相变热力学稳定性核子核反应临界温度

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Mathematical feature of photon spectra produced in ultra-relativistic heavy-ion collision

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nuclear Science and Techniques 1997年第1期8卷 18-22页

作者： Ai Xiao Bai(Ai Hsiao Bai) ( shanghai institute of nuclear research, the Chinese Academy of Sciences,{4. ) shanghaiinstituteofnuclearResarch theChineseAcademyofSciencesShanghai201800

ＭａｔｈｅｍａｔｉｃａｌｆｅａｔｕｒｅｏｆｐｈｏｔｏｎｓｐｅｃｔｒａｐｒｏｄｕｃｅｄｉｎｕｌｔｒａｒｅｌａｔｉｖｉｓｔｉｃｈｅａｖｙｉｏｎｃｏｌｉｓｉｏｎＡｉＸｉａｏＢａｉ（ＡｉＨｓｉａｏＢａｉ）（Ｓｈａｎ... 详细信息

ＭａｔｈｅｍａｔｉｃａｌｆｅａｔｕｒｅｏｆｐｈｏｔｏｎｓｐｅｃｔｒａｐｒｏｄｕｃｅｄｉｎｕｌｔｒａｒｅｌａｔｉｖｉｓｔｉｃｈｅａｖｙｉｏｎｃｏｌｉｓｉｏｎＡｉＸｉａｏＢａｉ（ＡｉＨｓｉａｏＢａｉ）（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＮｕ...

关键词：重离子碰撞夸克-胶子等离子体光子谱

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Synthesis and structural analysis of ^(13)C-fatty acids

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nuclear Science and Techniques 2000年第1期11卷 17-21页

作者： WANG Hui-Qiong ZHAO Xia-Ling TANG Guo-Zhong (shanghai institute of nuclear research, the Chinese Academy of Sciences,{4.) 中科院上海原子核所上海 201800

The 13C-labeled fatty acids octanoic-1-13C acid and palmitic-1-13C acid were synthetically prepared from Ba 13CO3. The yield of the former was more than 90% and that of the latter was above 85%. MS, IR, 1H-NMR and 13N... 详细信息

关键词：碳13脂肪酸合成结构表征质谱红外光谱核磁共振氢谱核磁共振碳谱

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The structure of the nucleosome core particle of chromatin in chicken erythrocytes visualized by using atomicforce microscopy

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Cell research 1999年第4期9卷 255-260页

作者： ZHAO HUI YI ZHANG SHU BING ZHANG CHUJIANG QI YE HE MIN QIAN LI RUO LANQIAN( shanghai institute of Cell Biology, Chinese Academyof Sciences, shanghai 200031, china)( shanghai institute of nuclear research, ChineseAcademy of Sciences, shanghai 201800, shanghai institute of nuclear research Chinese Academy of Sciences Shanghai 201800 China

INTRODUCTIONAlleukaryoticchromosomesconsistsofaregularlyrepeatingprotein--DNAcomplexcalledthenucleosome(Kornberg,1977)[******... 详细信息

INTRODUCTIONAlleukaryoticchromosomesconsistsofaregularlyrepeatingprotein--DNAcomplexcalledthenucleosome(Kornberg,1977)[******...

关键词： Nucleosome core particle chicken erythrocytes atomic force microscopy.

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