高级检索

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

2002年  第19卷  第3期

显示方式:
核物理
CSR能区重离子反应中的介子产生
姜焕清
2002, 19(3): 301-305. doi: 10.11804/NuclPhysRev.19.03.301
摘要:
重离子反应中介子产生的观测对于认识重离子反应动力学和核物质性质具有重要的意义 .讨论了重离子反应中阈能附近介子产生的一些特点和研究现状 ,特别讨论了π介子产生和K+ 介子产生 .在我国兰州重离子冷却储存环上开展这方面的实验研究具有可能性 ,可望得到很有意义的结果 .及时开展这方面实验研究和相应的理论研究是必要的.It is important to measure meson productions in heavy ion collisions in order to understand the dynamics of heavy ion reactions and the properties of nuclear matter. In this paper we review the characteristic and present status of meson productions near the threshold energies in heavy ion collisions. Especially the pion and K + productions are discussed. We point out that it is meaningful and possible to carry out the experimental studies at the CSR. It is necessary to carry out timely the...
核物质中的π,K,ρ和η物理
庄鹏飞
2002, 19(3): 306-315. doi: 10.11804/NuclPhysRev.19.03.306
摘要:
介绍了入射能量约1AGeV时的重离子碰撞产生的介子物理,分析了SIS和Bevalac两个重离子加速器的实验数据中显示的介质效应,特别是手征对称性在有限密度时的部分恢复信号,指出了目前理论研究中存在的问题 ,最后讨论了兰州重离子加速器CSR可以进行的介子物理研究.The meson physics in heavy ion collisions around energy 1 A GeV is investigated. The experimental data at SIS and Bevalac on medium effects, especially on the signatures of chiral symmetry restoration at finite density are analyzed, and the related problems in the study are pointed out. Finally the possible meson physics at cool storage ring (CSR) is discussed.
QCD求和规则的张量胶子球(2++)的质量
卢娟, 周丽娟, 朱基珍, 马维兴
2002, 19(3): 316-320. doi: 10.11804/NuclPhysRev.19.03.316
摘要:
利用量子色动力学求和规则计算了张量胶子球 (2++ )的质量 ,其结果与北京正负电子对撞机的BES实验组和MARKIII实验组的测量结果一致 ,表明张量胶子球的质量约 2 .2 3GeV左右。The mass of the tensor glueball (2 ++ ) is calculated in quantum chromodynamics(QCD) spectral sum rules. The theoretical prediction is in good agreement with the measurements of BES collaboration at BEPC, Beijing and MARK III, which indicates that the mass of the tensor glueball may be around 2.23 GeV.
AGB星演化过程中的元素核合成
张妙静, 张波, 厉光烈
2002, 19(3): 321-328. doi: 10.11804/NuclPhysRev.19.03.321
摘要:
简述AGB星元素核合成理论的发展历程 .特别是 ,对慢中子俘获过程 (s 过程 )的机制及相关的AGB星演化图像作了简单介绍. The development of nucleosynthesis theory in Asymptotic Giant Branch (AGB) stars is reviewed. Particularly, the slow neutron capture processes (s processes) and the evolution of AGB stars are briefly described.
与散裂中子靶物理相关的理论计算程序探讨I薄靶计算
樊胜, 于洪伟, 申庆彪, 赵志祥
2002, 19(3): 329-333. doi: 10.11804/NuclPhysRev.19.03.329
摘要:
利用中能强流质子加速器形成的散裂中子源作为外加中子源驱动次临界反应堆的洁净核能系统是目前国际上的一个研究热点 .散裂中子源是这个系统的一个重要部分 ,也是一个急需解决的重点.有关散裂靶物理的理论计算程序的建立和基准检验是目前工作的一个重点.The research for intermediate energy proton accelerator driven radiologically clean nuclear power system has attracted considerable attention. The spallation neutron source induced by intermediate energy proton nucleus interaction is a key point and has not solved yet for the transmutation and applications. The theoretical programs related to the spallation neutron source for accelerator driven system (ADS) are discussed at present work.
加速器
HIRFL-NB1控制系统的设计
郑伟绩, 张峡, 黄新民, 尹全民
2002, 19(3): 334-337. doi: 10.11804/NuclPhysRev.19.03.334
摘要:
通过对新B1聚束器的介绍 ,比较详细地分析了NB1腔体内部组件对谐振频率的影响 ,并以此为依据,阐述了NB1控制系统的设计应如何结合其物理特性 ,最终设计出了一套实时控制系统 .该系统包含RF发射机控制系统和拖动控制系统 ,均可手动和计算机对RF发射机和 5个步进电机实时控制. With the introduction of New Buncher 1 system, the article analyzes the influence that these inner components of the NB1 cavity upon it’s working frequency in detail, and according to the physical characteristics of the NB1 cavity, a set of real time control system will be carried out. The NB1 control system includes RF emitter control and moving system control, which both have local control and computer control on RF emitter and five stepping motors.
光阴极微波电子枪中发射度补偿及模拟计算
刘圣广, 李永贵
2002, 19(3): 338-341. doi: 10.11804/NuclPhysRev.19.03.338
摘要:
介绍了上海深紫外自由电子激光用光阴极微波电子枪采用发射度补偿技术的结果 .详细分析了线性空间电荷力的特点及对束流发射度的影响 ,从束流动力学和相空间两方面讨论了发射度补偿原理 .给出了补偿线圈的设计结构及其轴向场分布 .利用PARMELA程序对补偿效果作了模拟计算 .结果表明 ,设计的腔体对单圈 1 .5nC束团 ,在枪出口后 1 .2m处 ,电子能量为 5 .7MeV ,横向归一化发射度εn ,RMS=1 .61 2πmm·mrad. The emittance compensation technology will be used on the photo cathode RF gun for Shanghai SDUV FEL. In this paper, the space charge force and its effect on electron beam transverse emittance in RF gunis is studied, the principle of emittance compensation in phase space is discussed. We have designed a compensation solenoid and calulated its magnetic field distribution. Its performance has been studied by the code PARMELA. A simulation result indicates that the normalized transverse RMS emi...
交叉学科
高电荷态离子与表面相互作用
张小安, 肖国青, 王武生, 毛瑞士
2002, 19(3): 342-346. doi: 10.11804/NuclPhysRev.19.03.342
摘要:
论述了高电荷态离子与表面相互作用的过程 ,说明了发射电子、发射光子、负离子、中性粒子、正离子的散射和发射的物理机理以及应用前景 .介绍了在兰州重离子国家实验室ECR源建立高电荷态离子与表面相互作用的原子物理平台的重要意义和将要开展的工作.The interaction between highly charged ions and surface is investigated, the mechanisms for emissions of electrons, photons and scattered neutral particles, negative and positive ions are reviewed. We report a new atomic physics station in ECR and our work plan.
量子噪音与量子Langevin方程
文万信, 靳根明
2002, 19(3): 347-351. doi: 10.11804/NuclPhysRev.19.03.347
摘要:
介绍了量子噪音和量子Langevin方程 ,并与经典噪音和经典Langevin方程进行了比较 .量子噪音来源于两种途径 ,第一种与经典噪音相似 ,第二种则起源于Heisengberg测不准原理 .同时 ,也简略给出了量子Langevin方程的推导.The properties of quantum noise and Langevin equation are discussed. Comparisons between the quantum noise and Langevin eqution and the classic one are presented. A brief derivation for quantum Langevin equation is showed. The quantum noise comes from two ways, namely, the way as same as that of classic noise and the Heisenberg uncertainty.
快堆有效增殖因子的灵敏度分析
荣健, 刘桂生
2002, 19(3): 352-356. doi: 10.11804/NuclPhysRev.19.03.352
摘要:
采用一级微扰理论研究了有效增殖因子Keff随截面变化的灵敏度 ,以GODIVA和ZPR 6/7两个快中子基准装置为例 ,计算了它们的Keff相对于 ν值、裂变截面和俘获截面的灵敏度函数 .经对计算结果分析和与FORSS计算结果的比较 ,表明计算正确反映了问题的物理意义 ,结果可靠 ,能够用于实际的基准检验工作中.The first order perturbation theory is used to calculate the sensitivity profile of K eff in fast facility. The calculated formulas are given in the sphere co ordinate. As an example, the sensitivity profiles of K eff to ,σ n,f and σ n,γ of GODIVA and ZPR 6/7 are all calculated. The results are also compared with those of FORSS. The calculation results have correct physical meaning and are reliable for application in the actual benchmark review.
塑料闪烁体中子探测效率及相对发光产额的标定
彭太平, 罗小兵, 张传飞, 李如荣, 张建华, 夏宜君, 杨志华
2002, 19(3): 357-360. doi: 10.11804/NuclPhysRev.19.03.357
摘要:
利用加速器中子源研究了用于标定塑料闪烁体中子探测效率及相对发光产额的实验技术 ,在四川大学原子核科学技术研究所 2 .5MeV静电加速器上 ,利用T(p,n)和D(d ,n)核反应作为中子源 ,在 0 .6—5MeV中子能区对直径为 40mm ,厚度为 5mm的 1 42 1塑料闪烁体的中子探测效率及相对发光产额进行了测定.A method used for the calibration of neutron efficiency and the relative photo yield of plastic scintillator is studied. T(p,n) and D(d,n) reactions are used as neutron resources. The neutron efficiencies and the relative photo yields of plastic scintillators 1421 (40 mm in diameter and 5 mm in thickness) are determined in the neutron energy range of 0.655—5 MeV.
MOS结构剂量探测器研究进展
程松, 刘伯学, 毛用泽
2002, 19(3): 361-364. doi: 10.11804/NuclPhysRev.19.03.361
摘要:
介绍了MOS结构剂量探测器的基本测量原理 ,回顾了国内外利用MOS结构作为剂量探测器的发展过程和研究现状 ,分析了MOS结构剂量探测器的主要性能指标以及其在核辐射剂量监测和空间环境监测等领域的应用前景. We presente the principle of MOS structure dose detector, reviewe the development and status in this area, and summarise the technique parameters of MOS structure detector, which is widely used in the regions of radiation dose mesurement and space environment monitoring and so on.