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2003年  第20卷  第4期

核物理
P同位素的质子滴线核研究
陈立新, 肖国青, 郭忠言, 詹文龙, 李加兴, 孙志宇, 王武生, 王猛, 陈志强, 胡正国, 白洁, 李琛, 毛瑞士
2003, 20(4): 231-234. doi: 10.11804/NuclPhysRev.20.04.231
摘要:
研究了在相对论平均场近似下P同位素的滴线核的性质,首先在理论上探讨了25P作为P的滴线核存在的可能性及其可能具有的质子晕结构,然后给出了在兰州放射性束流装置上25P的实验鉴别结果. Great progress was made on the study of P isotope both in theory and in experiments, but the final conclusion about the dripline of P isotope has not been made. In this article the properties of P isotope was studied in the frame work of relativistic mean field (RMF). First the probability of 25P as the dripline nuclei of P isotope and the proton halo structure of 25P was discussed, and then the RIBLL experiental result of 25P is presented.
7Be半衰期的精确测量
刘志毅, 李成波, 王思广, 周静, 孟秋英, 卢绍军, 周书华, 容超凡, 袁大庆
2003, 20(4): 235-238. doi: 10.11804/NuclPhysRev.20.04.235
摘要:
用两套γ谱仪精确测量了注入到天然铍和天然金中的7Be发生电子俘获的半衰期.测得7Be在天然铍中半衰期为53.275(25)d,在天然Au中为53.270(19)d.该结果还表明,在这两种材料中7Be半衰期的相对变化小于0.12%. The half-life of 7Be implanted in natural beryllium and in natural gold has been measured with high precision using two high-purity germanium detectors. T_(1/2)=53.275(25) d in natural beryllium and T_(1/2)=53.270(19) d in natural gold is obtained. Within our experimental precision, the difference in the effect of host media beryllium and gold on the half-life of 7Be isn t observed and an upper limit 0.12% of this effect can be set.
质子入射散裂产物理论研究方法探讨
张鸿洲, 樊胜, 阎芳, 孙秀泉
2003, 20(4): 239-246. doi: 10.11804/NuclPhysRev.20.04.239
摘要:
简要介绍了几种关于中高能质子入射引起散裂反应产物理论计算的方法,以及这些方法的最新发展.比较了这些方法在理论计算中的特点,指出经典外推方法有局限性,量子分子动力学方法和改进后的M C方法的计算结果与实验数据有较好的符合,但是计算量大,而且量子分子动力学方法在与宏观输运理论连接上存在不少的困难.半经验计算方法已经取得了初步的成果,需要根据新的实验结果来对其进行发展. The analysis on spallation product of proton-induced reaction with intermediate energy has important applications, such as astrophysics, biophysics, spallation neutron source, and accelerator-driven system (ADS) etc. In recent year, some theoretical models have been developed to investigate this reaction processes. At present work, we introduce the extrapolated classic theory, the quantum molecule dynamic (QMD) plus statistical decay and fission models, the method of Mento-Carlo and Smiempirical method for...
加速器
兰州重离子冷却储存环二极磁铁设计
马力祯, 袁平, 何源, 张斌, 刘维军, 韩少斐, 熊慧, 何锐荣, 夏佳文, 詹文龙
2003, 20(4): 247-251. doi: 10.11804/NuclPhysRev.20.04.247
摘要:
介绍了兰州重离子冷却储存环主环(CSRm)的改进W型二极磁铁和实验环(CSRe)C型二极磁铁的磁场计算和物理设计,在降低了磁铁造价和运行费用的前提下设计参数达到或超过了物理要求.根据样机的加工和检测结果来看,所有的磁场计算和物理设计的结果是可靠的.Magnetic field calculation and design of CSRm modified W-type dipoles and of CSRe C-type dipoles are presented in this paper. Under the condition of lower cost, all of the designed parameters are better than required values. Now the prototype has been fabricated and also the magnetic field measurement has been done. According to the measured results, all the calculation and design are very reliable.
内置垫补线圈的C型二极磁铁
何源, 袁平, 马力祯, 张斌, 刘维军, 韩少斐, 熊慧, 王玥, 王文进, 何锐荣, 宋明涛, 夏佳文, 詹文龙, 魏宝文
2003, 20(4): 252-254. doi: 10.11804/NuclPhysRev.20.04.252
摘要:
对HIRFL CSR的原形磁铁进行了试制和研究.尝试了一种新的改善磁场分布的方法:在不增大极头的条件下使用两根内置导线,实践证明是可行的.用OPERA 2D和TOSCA 3D软件分析了垫补电流对中、低场的影响,同时也介绍了这块C型二极磁铁的制作工艺及磁场测量结果. The C-type dipole prototypes in the injection beam line from a Separate Sector Cyclotron (SSC) to Cooling Storage Ring (CSR) are selected as R & D for CSR magnets fabrication, because they have large bending angle and small radius, and are very difficult to stack and fabricate. A method to obtain good field homogeneity has been attempted in the C-type dipole prototype. This method is not the enlarged dipole pole but two imbedded conductors and two small power supplies. This is easy operating....
基于HIRFL-CSR中剥离器的支束线物理设计
张雪荧, 尹全民, 唐靖宇, 徐瑚珊, 李文飞, 毛瑞士
2003, 20(4): 255-258. doi: 10.11804/NuclPhysRev.20.04.255
摘要:
介绍了通过剥离器后不同电荷态的束流在弯曲磁铁中的传输情况,由此引出一种切割束流的方法,在此基础上设计了一条支束线,以实现两个实验终端同时供束,增加供束时间.在束运线设计过程中,根据HIRFL CSR的实际条件,对束流的中心轨迹和束流包络做了详细的计算,给出了束流输运线的几何布局和各个元件的基本物理参数. A new branch beam line downstream of the stripper located between SFC and SSC is designed to collect the beams with the charge states other than the most intensive one. The layout of the branch beam line and the physical parameters for each dipole and quadrupole are given based on careful calculations.
康普顿背散射技术对贮存环电子束诊断及其应用--I电子束能量的精确测量及光学标准实验站
顾嘉辉, 蔡翔舟, 郭威, 沈文庆
2003, 20(4): 259-263. doi: 10.11804/NuclPhysRev.20.04.259
摘要:
简单叙述了采用康普顿背散射技术精确测量电子束能量的技术,并指出建立辐射标准实验站对精确电子束能量测量的需求. The technique to measure the electron beam energy accurately with Compton backscattering technique is introduced and requirements for the experimental stations of radiometry are also described in the paper.
磁控注入电子枪的研究
赵青, 李宏福, 任同, 罗勇
2003, 20(4): 264-267. doi: 10.11804/NuclPhysRev.20.04.264
摘要:
介绍了毫米波回旋速调管磁控注入电子枪的结构与特点.依据回旋管对电子枪的要求,考虑相对论效应和空间电荷效应,编制了一套计算程序.利用电子枪模拟程序对电子轨迹进行模拟计算,研究了电极形状、磁场分布以及电子轨迹与电子注参量的影响,为磁控注入电子枪的设计提供了理论依据. The Structure and characteristics of the magnetron injection gun (MIG) for mm wave gyro-klytron are introduced. According to the requirements for the gyro-klytron, the relativistic effect and the space charge effect is taken into account . A program is developed for CAD. An electron gun code is used to simulate the electron trajectory, the influence of electrode shape, magnet field, electron trajectory on the electron beam have been studied. The theory for design of the electron gun is presented.
交叉学科
电子原子碰撞K壳层电离截面研究(英文)
安竹, 刘慢天, 唐昶环, 付玉川, 彭秀峰, 何福庆, 罗正明
2003, 20(4): 268-276. doi: 10.11804/NuclPhysRev.20.04.268
摘要:
近年来,研究组发展了一套利用厚衬底薄靶测量电子原子碰撞内壳层电离截面的方法.该方法具有避免制作自支撑薄靶困难的优点.最近,又采取了一些措施来提高该方法测量数据的精度.首先评述了近年来该领域的一些研究进展,并通过测量Cr元素在小于26keV能量范围K壳层电离截面的例子介绍了研究组的实验方法.同时,也对8种低Z元素和16种中、高Z元素在keV能区的实验数据和理论模型、经验公式进行了比较,并对目前电子原子碰撞K壳层电离截面的实验测量和理论研究的现状及需进一步开展的工作进行了讨论. In this paper, we give a description of recent progress on the measurements of electron-impact K-shell ionization cross-sections of atoms in the keV energy range. We present our experimental method of using thin targets with thick substrates and our measurements taken recently to improve the accuracy of the experimental data by an example of measuring K-shell ionization cross-section for Cr element within the incident energy of less than 26 keV. We also compare the K-shell experimental data sets availab...
等效磁场与弯晶沟道辐射
罗诗裕, 邵明珠, 吴木营
2003, 20(4): 277-280. doi: 10.11804/NuclPhysRev.20.04.277
摘要:
引入场指标和等效磁场概念,把粒子在弯晶沟道中的运动行为等效为回旋加速器中的粒子运动.结果表明,描写粒子的运动方程是一个非线性薛定谔方程.在小振幅近似下找到了系统的严格解和粒子振动周期,导出了瞬时辐射强度和最大辐射频率. The sine-squared potential and the equivalent magnetic field intensity have been introduced, the motion equation of the particle in bent crystal has been derived, the motion equation and the oscillation period of the particle have been solved exactly by Jacobian elliptic fuanction and the first kind of complet elliptic integrals, the intensity and the spectral properties of channelling radiation in bent crystal discussed.
12C6+离子辐照小鼠Lewis肿瘤的研究
李文建, 郭红云, 李德杏, 党秉荣, 马秋峰, 周利斌, 王潇, 郝冀芳, 毛淑红
2003, 20(4): 281-283. doi: 10.11804/NuclPhysRev.20.04.281
摘要:
研究了HIRFL提供的12C6+离子辐照C57BL/6J小鼠右后腿移植的Lewis肿瘤的生长延迟和碳离子辐照对Lewis肿瘤小鼠寿命的延长.结果表明,碳离子照射的小鼠肿瘤生长体积明显地小于对照的体积.在剂量相同、分次数辐照越多时,肿瘤生长就越缓慢,肿瘤抑制就越高.在辐照分次数相同时,不同剂量对受照肿瘤生长体积未产生差异.在4Gy×3,8Gy×3和12Gy×2组3种辐照剂量下,小鼠寿命的P值小于0.05;可知小鼠的寿命延长具有统计学意义. Growth delay of the transplantable Lewis tumors growing in right hind legs of C(57) BL/6J mice and life prolongation of the mice with Lewis tumors were investigated after()~(12)C~(6+) ion radiation at HIRFL. The results show that growth volumes of the mouse tumors following carbon radiation are distinctly less than control during 21 days; the more fractions of radiation with same doses, the slower growth of tumors and the higher inhibition of tumors; different doses with the same fractions of radiation ...
离子束微探针及其扫描断层分析应用研究
王铁山, 王贤义, 肖国青, Dieter Grambole, Folker Herrmann
2003, 20(4): 284-289. doi: 10.11804/NuclPhysRev.20.04.284
摘要:
以欧共体离子束物理及材料科学研究所的装置为例介绍了离子束微探针实验装置,给出了利用这一装置开展重离子弹性反冲核分析、研究氢在钛合金中的微观分布及其动力学行为的实验结果.该离子束微探针装置可以用来开展带电离子荧光分析、核反应分析、弹性反冲核分析、卢瑟福背散射分析及沟道效应和高离子束密度、大剂量离子注入等分析和研究工作.同时利用微束扫描分析可获得样品中元素的点、线、面分布信息.利用能量为16MeV、直径为3μm的Si5+离子束对钛合金中氢进行断层面扫描分析,观测到了氢在钛合金中的非均匀分布,揭示了氢在钛合金中的不同物理、化学状态与空间分布的相关性,为进一步研究钛的氢化和金属钛的表面腐蚀行为提供了科学依据. As an expmple, the nuclear micro-probe facility in the Forschungszentrum Rossendorf is introduced, which has a minimum beam size of 2 micrometers and can be used to perform particle induced X-ray emission (PIXE), nuclear reaction analysis (NRA), elastic recoil detection analysis (ERDA), Rutherford back scattering (RBS) and channeling etc. micro-beam analyses. By using single point, linear and lateral scanning, the elements composition and distribution in samples can be studied in micrometer scale...
AMS测量中同量异位素的鉴别方法
管永精, 何明, 阮向东, 董克君, 吴伟明, 姜山
2003, 20(4): 290-294. doi: 10.11804/NuclPhysRev.20.04.290
摘要:
在加速器质谱测量中,存在同位素和同量异位素的干扰.排除同位素的干扰是开展超微量核素分析的重要课题之一.主要介绍了加速器质谱测量中同量异位素的几种鉴别、排除方法,以及这些方法的原理、发展及应用. There are interference of isotopes and isobars in accelerator mass spectrometry (AMS) measurements. Eliminating the isobaric interference is the important aspect in AMS measurements. Several methods of isobaric identification in AMS measurements are discussed in this paper. Principles, developments and applications of these methods are also introduced.
核能与核数据库
中子俘获瞬发γ活化分析数据库
周春梅
2003, 20(4): 295-299. doi: 10.11804/NuclPhysRev.20.04.295
摘要:
简要地介绍了热中子俘获瞬发γ射线数据的测量、评价、检验及其中子俘获瞬发γ射线活化分析数据库的研制、结构和基本数据内容等. The evaluation, measurement, and check of prompt γ-ray data for neutron capture are presented. The development of the database of prompt γ-ray activation analysis for neutron capture, and its structure and basical data are also described in the text.