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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 {3., the Chinese Academy of Sciences,{4.) shanghaiinstituteofnuclear{3. 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

β-delayed proton decays near the proton drip line

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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 73.000, China 2. nuclear Physics Department, China institute of Atomic Energy, Beijing 1024.3. China 3. Department of Technical Physics, Peking University, Beijing 100871, China {3.,{4., 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 93.d 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.

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,{3.) shanghai institute of nuclear {3. 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 0.013. 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

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 73.000 shanghai {3. 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

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 {3., 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

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 {3., the Chinese Academy of Sciences,{4.) 中科院上海原子核所上海 201800

The 13.-labeled fatty acids octanoic-1-13. acid and palmitic-1-13. acid were synthetically prepared from Ba 13.O3. The yield of the former was more than 90% and that of the latter was above 85%. MS, IR, 1H-NMR and 13.... 详细信息

关键词：碳13.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

Study of rotational bands of ^(129)La using the projectedshell model

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nuclear Science and Techniques 1999年第3期10卷 149-154页

作者： WANG Zixing SHEN Shuifa SHI Shuanghui GU Jiahui LIU Jingyi ZHU Zhiyuan (shanghai institute of nuclear {3., the Chinese Academy of Sciences,{4.) shanghai institute of nuclear {3. Chinese Academy of sciences Shanghai 201800 China

The projected shell model is applied to the nucleus 129La. The present results of theoretical calculations about the one-quasiproton bands are compared with experimental data. The agreement with both the yrast πh11/2 band πg7/2 band is satisfactory. We also assign the πg7/2 [νh11/2]2 configuration with an oblate shape for one of bands in 129La.

关键词：奇数质子核 129La 高层模型旋转能带

Extraction of Th(IV) from nitric acid with 4.benzoyl-2,4.dihydro-5-methyl-2-phenyl-3.-pyrazol-3.thione

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nuclear Science and Techniques 1998年第2期9卷 118-120页

作者： Yu Shao-Ning Yang Yan-Zhao Bao Bo-Rong (shanghai institute of nuclear {3., the Chinese Academy of Sciences,{4.)Wang Teng-Jia Ma Li and He Ying (Naval Medical {3. institute, shanghai 2004.3. shanghai institute of nuclear {3. Chinese Academy of Sciences Shanghai 201800 China Naval Medical research institute Shanghai 200433 China

The BMPPT (4.benzoyl-2,4.dihydro-5-methyl-2-phenyl-3.-pyrazol-3.thione)was synthesized from BMPP. Its m.p. is 106-108℃. The results of the element analysis are as follows: C, 68.51%, H, 4.51%, N, 9.26%, S, 11.4.%, which are in conformity with the theoretical value (C, 69.15%, H, 4.76%, N, 9.52%, S, 10.90%). The solvent extraction of Th4. from nitric acid solution by BMPPT in benzene was studied. The extraction ability of BMPPT is not so high as that of its parent (BMPP). The Th4. distribution ratio (DTh) increases with the increasing pH of the aqueous phase, and pH1/2 for Th4. was 3.2 ([BMPPT]=0.10 mol/L). When the pH increases, the distribution ratio of Th4. increases linearly with the slope of 1 .59. When the concentration of BMPPT increases, the distribution ratio of Th4. increases rapidly. The lgDTh-lg[BMPPT] is linear with the slope of 1.4. and the extraction mechanism is the cation ion-exchange.

关键词：钍溶剂提取提取比例分布

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 {3., 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