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Evolution from Sequential Decay to Simultaneous Multifragmentation with Increasing Beam Energy

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Chinese Physics Letters 1996年第3期13卷 168-171页

作者： HE Zhi-yong jin gen-ming LI Zu-yu DUAN Li-min DAI Guang-xi ZHANG Bao-guo WU He-yu WEN Wan-xin LUO Qing-zheng QI Yu-jin Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

Two-fragment correlation functions have been measured for ^(40)Ar+^(197)Au collisions at E/A=25 *** on the three-body trajectory calculation,a mean emission time of T~450 fm/c for light fragments was extracted from th... 详细信息

关键词： functions. energy. decay

Rotational Effect of Intermediate Mass Fragments for ^(40)Ar+^(159)Tb Reaction at 30 MeV/Nucleon

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Chinese Physics Letters 1998年第1期15卷 13-15页

作者： HE Zhi-yong LI Zu-yu DUAN Li-min ZHANG Bao-guo jin gen-ming DAI Guang-xi FU Yan-biao WANG Hong-wei WANG Su-fang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

The in-plane and out-of-plane emissions of light charged particles and intermediate mass fragments were measured for ^(40)Ar+^(159)Tb collisions at 30 MeV/*** in-plane enhancement was observed for mid-rapidity light particles and fragments,indicating that a rotational effect exists in this reaction *** enhancement increased with mass for light particles with Z≤2,but became nearly constant values for fragments with Z≥*** enhancement was observed to increase strongly with increasing impact parameter.

关键词： parameter plane light

Evidence for Different Fission Behavior of Hot Nuclei Formed in Central and Peripheral Collisions of ^(40)Ar+^(209)Bi Reaction at 25 MeV/u

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Chinese Physics Letters 1999年第7期16卷 499-501页

作者： WU En-jiu ZHENG Ji-wen XIAO Zhi-gang ZHANG Chun TAN Ji-lian YIN Shu-zhi WANG Su-fang jin gen-ming YIN Xu SONG ming-tao jin Wei-yang PENG Xing-ping LI Zu-yu WU He-yu HE Zhi-yong JIANG Dong-xing QIAN Xing Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 Department of Technical Physics Peking UniversityBeijing 100871

Correlated fission fragments from the reaction of 25MeV/u ^(40)Ar+^(209)Bi and their further correlation with a par-tides have been studied for peripheral and central collisions *** excitation energy at scission deduced from postscission multiplicity is about 1725 *** fission timescale deduced from prescission multiplicity is about 4×10^(21)*** analysis of the mass and energy distributions of Hssion fragments as a function of the initial temperature of hot fissioning nuclei reveals the existence of different fission behavior of hot nuclei formed in central and peripheral *** data demonstrate the change of Hssion behavior at T~4MeV.

关键词： MeV/u multiplicity deduced

Non-equilibrated Emission of Intermediate Mass Fragments in 25 MeV/n ^(40)Ar+^(nat)Ag Reaction

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Chinese Physics Letters 1998年第4期15卷 255-257页

作者： QIAN Tao JIANG Dong-xing HUA Hui jin gen-ming WU En-jiu ZHENG Ji-wen YIN Shu-zhi TAN Ji-lian HE Zhi-yong LI Zu-yu DUAN Li-min Department of Technical Physics Peking UniversityBeijing 100871 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

In order to clarify whether statistical or dynamical treatments for emission of intermediate mass fragments(IMFs)will be needed in the intermediate energy heavy ion collisions,the measured angular and energy distributions of IMF(3≤Z≤6)in 25 MeV/n ^(40)Ar+^(nat)Ag were analyzed by means of statistical calculation code GEMINI and quantum molecular dynamics code(QMD).While the angular distribution calculations with GEMINI code are not compatible with the experimental ones,the QMD calculations for inclusive angular distributions and energy spectra of IMF are in good agreement with the measured ones.

关键词： angular calculations quantum

1,6-二磷酸果糖对油酸型急性呼吸窘迫综合征大鼠治疗作用的研究

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现代预防医学 2009年第17期36卷 3382-3383+3385页

作者：金春梅金明根延边大学医院检验科延边大学医院呼吸内科

[目的]探讨1,6-二磷酸果糖(FDP)对油酸致伤大鼠急性呼吸窘迫综合征治疗作用的可能机制。[方法]将30只健康的Wistar大鼠随机分为对照组、ARDS模型组、FDP治疗组,对照组:静脉注入生理盐水2.1ml/kg;ARDS模型组:注入油酸0.1ml/kg,然后注入... 详细信息

[目的]探讨1,6-二磷酸果糖(FDP)对油酸致伤大鼠急性呼吸窘迫综合征治疗作用的可能机制。[方法]将30只健康的Wistar大鼠随机分为对照组、ARDS模型组、FDP治疗组,对照组:静脉注入生理盐水2.1ml/kg;ARDS模型组:注入油酸0.1ml/kg,然后注入生理盐水2.0ml/kg。FDP治疗组:注入油酸剂量和方法同上,然后注入用生理盐水稀释的FDP400mg/kg(2.0ml/kg)。3h后测定肺组织SOD,MDA,并计算左肺湿干重比值,行肺组织病理学观察。[结果]ARDS组与对照组比较,左肺湿干重比值、肺组织中MDA含量明显升高,而肺组织中SOD酶活性明显降低,肺组织出现明显病理损害,FDP治疗组动物肺损伤轻于模型组。[结论]FDP可抑制MDA升高,提高肺组织SOD酶活性,FDP对实验性大鼠油酸型急性呼吸窘迫综合征有一定的治疗作用。

关键词： 1,6-二磷酸果糖急性呼吸窘迫综合征油酸

Breakup of 33.4MeV/u ^(17)N on a ^(9)Be Target

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Chinese Physics Letters 2000年第3期17卷 188-190页

作者： HUA Hui JIANG Dong-Xing LI Xiang-Qing QIAN Tao WU He-Yu jin gen-ming ZHAN Wen-Long DUAN Li-Min XIAO Zhi-Guang GUO Zhong-Yan LI Zu-Yu WANG Hong-Wei WANG Su-Fang Department of Technical Physics Peking UniversityBeijing 100871 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

Correlation measurements of neutrons and fragments have been performed in a reaction of 33.4MeV/u ^(17)N on a ^(9)Be *** spectra of n and nitrogen fragments were obtained at different *** on the nuclear diffraction dissociation model,the measured energy spectra and the neutron angular distributions were reproduced quite well assuming that ^(17)N was composed of ^(16)N and n or ^(15)N and 2n interacting with the nonlocal separable *** satisfactory agreement between the theoretical calculations and the experimental data shows that the contribution of Coulomb dissociation is negligible in the reaction concerned.

关键词： potential. dissociation negligible

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中科院近物所的SHIM物理研究

原子核物理评论 2000年第3期17卷 127-128页

作者：靳根明金运范中国科学院近代物理研究所甘肃兰州730000

简要介绍了 SHIM物理及其近 1 0年来国际研究的最新进展 ,重点介绍了中国科学院近代物理研究所在该学科研究中所获得的部分最新研究结果 ,展望了

关键词：强电子激发效应 SHIM物理快重离子

Detector Calibration by Monte Carlo Simulation Based on the Energy-Range Relationship of Energetic Ions

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Chinese Physics Letters 1999年第1期16卷 15-17页

作者： FANG De-qing FENG Jun CAI Xiang-zhou WANG Jian-song SHEN Wen-qing MA Yu-gang ZHU Yong-tai LI Song-lin WU He-Yu GOU Quan-bu jin gen-ming ZHAN Wen-long GUO Zhong-yan XIAO Guo-qing Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

The experimental measurement of the total interaction cross sections of N,C,B,and Be isotopes on 12C target at medium energies is described.A new formula that gives a good description of the energy-range relationship of energetic ions over a wide energy range is *** energy calibration of detectors is made by a Monte Carlo simulation method based on this new formula.

关键词： formula interaction Energetic

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CSR外靶实验终端中子流测量的模拟

高能物理与核物理 2006年第11期30卷 1083-1087页

作者：付芬肖志刚靳根明冯兆庆中国科学院近代物理研究所

随着兰州重离子加速器冷却储存环(HIRFL-CSR)外靶实验终端中子墙的建立,为实验测量高能中子提供了机遇．为确定CSR外靶实验终端对中子流测量的可行性,基于BUU理论模型分别对对称系统(Ni+Ni,Pb+Pb)和非对称系统(Pb+Ni)进行了模拟计算,发... 详细信息

随着兰州重离子加速器冷却储存环(HIRFL-CSR)外靶实验终端中子墙的建立,为实验测量高能中子提供了机遇．为确定CSR外靶实验终端对中子流测量的可行性,基于BUU理论模型分别对对称系统(Ni+Ni,Pb+Pb)和非对称系统(Pb+Ni)进行了模拟计算,发现当系统能量达到几百MeV／u时,中子流信号相当明显,并与碰撞参数有明显的依赖关系．模拟结果表明,在前角20°的覆盖范围内,可以较好地实现中子流测量所需要的反应平面确定及碰撞参数选择．对双击事件及其对中子流的影响进行了简单的讨论．

关键词： CSR 中子流反应平面碰撞参数