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2001年  第18卷  第1期

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核物理
相对论和非相对论理论模型研究奇异核的性质
陈宝秋, 马中玉
2001, 18(1): 1-8. doi: 10.11804/NuclPhysRev.18.01.001
摘要:
采用相对论和非相对论理论模型可描述奇异核的性质 .相对论平均场理论预言了2 6,2 7,2 8P存在一个质子晕 ,而27,28,29S存在两个质子晕 .最近 ,MSU的最新的实验发现了2 6,2 7,2 8P核存在一个质子晕.采用相对论 Hartree- Fock理论研究了 Fock项和矢量介子对奇异核性质的贡献,研究表明交换项和矢量介子对非常丰中子核性质的影响非常不同于对稳定线附近核性质的影响.同时,采用形变的Hartree- Fock- Bogoliubov理论研究了某些轻核同位素链的性质和形变.
奇异强子物质的有效模型描述
宋宏秋, 章利良, 苏汝铿, 王平
2001, 18(1): 9-15. doi: 10.11804/NuclPhysRev.18.01.009
摘要:
把 FST模型推广到包含奇异性的情形,并在平均场近似下用它来研究含有核子、Λ超子和Ξ超子的奇异强子物质的性质.讨论了有效重子质量对介质密度和奇异数含量的依赖性以及奇异强子物质的饱和性和稳定性. The strange hadronic matter with nucleon, Λ hyperon and Ξ hyperonis was studied by using an effective model in a mean field approximation. The density dependence of the effective baryon masses as well as the saturation properties and stabilities of the strange hadronic matter were discussed. The result indicates a quite large strangeness fraction range where the multi hyperon nuclear matter is stable against particle emission. In the large strangeness fraction region the Ξ component dominates...
混合对称态对Majorana相互作用的依赖性(英文)
龙桂鲁, 屠长存, 李岩松, 田琳, 纪华鹰, 朱胜江, 赵恩广, 刘风英
2001, 18(1): 16-20. doi: 10.11804/NuclPhysRev.18.01.016
摘要:
在 IBM2中研究了混合对称态 .发现某些较高自旋的混合对称态随着 Majorana相互作用很快变化 .这个结果改变了传统的关于混合对称态的观点 :最大 F旋态的能量最低 ,F旋越小 ,能量越高 .Fmin或 Fmin- 1的态会成为 yrast或 yrare态 .这些态很难向下衰变 ,因而很稳定.这个研究的结果表明可能存在一种由于质子和中子自由度的特殊性质而引起的新的同质异能态. Mixed symmetry states were studied in the framework of the neutron proton interacting boson model(IBM2). It was found that some of the mixed symmetry states with moderate high spins changed very fast with respect to the Majorana interaction. This changes our traditional picture that the maximum F spin states are the lowest in energy, the smaller the F spin, the higher the energy. The minimum F spin states or the state with F spin next to minimum may become the yrast or...
重离子碰撞中的同位旋效应
刘建业, 赵强, 左维, 杨艳芳, 郭文军
2001, 18(1): 21-29. doi: 10.11804/NuclPhysRev.18.01.021
摘要:
根据近年来利用同位旋相关输运理论在中能重离子碰撞同位旋效应研究方面的成果 ,并结合国际上在该问题上的进展 ,综合介绍和分析了中能重离子碰撞中的多重碎裂、原子核阻止和前平衡发射中子-质子比的同位旋效应及其随入射道条件:入射能量、碰撞参数、碰撞系统的质量 ,特别是随中子-质子比的演化过程.讨论了利用以上物理观测量在提取同位旋非对称核物质状态方程知识方面的可能性 ,并对其发展进行了展望. Based on the achievements for the intermediate energy heavy ion collision in our recent work and the progresses in the world, the isospin effects and the dependence of the entrance channel conditions on them in the intermediate energy heavy ion collisions were introduced, analysed and commended. From the calculation results by using isospin dependence quantum molecular dynamics, it is clear to see that the nuclear stopping power strongly depends on the in medium isospin dependence...
h→0时非相对论量子力学如何与牛顿力学等价
梅时中
2001, 18(1): 30-34. doi: 10.11804/NuclPhysRev.18.01.030
摘要:
假设 h→ 0时一个正确的非相对论量子力学与牛顿力学等价 .以此为出发点 ,对目前公认的非相对论量子力学作了细微的修改 .改动后的非相对论量子力学被证明在 h≠ 0时与修改前的完全等价 ,在 h→ 0时 ,与牛顿力学等价 .这样做的意义在于 ,如果进一步假设 h→ 0时一个正确的相对论量子力学和爱因斯坦的相对论等价 ,那么就有可能得到与现有相对论量子力学预言不同的结论 ,这将有助于它的检验或完善. It’s assumed that when →0, correct non relative quantum mechanics should be equivalent to Newtonian mechanics. Starting from this point, we slightly revised the widely accepted non relative quantum mechanics such that the mechanics after modification is strictly equivalent to that before the modification when ≠0, and equivalent to Newtonian mechanics in the limit →0. The significance lies in the possibility that if we further postulate that corrected relative quantum mechanics...
加速器
兰州重离子冷却储存环工程
夏佳文, 詹文龙, 魏宝文, 原有进, 宋明涛, 张文志, 杨晓东, 赵红卫
2001, 18(1): 35-38. doi: 10.11804/NuclPhysRev.18.01.035
摘要:
兰州重离子加速器冷却储存环是兰州重离子研究装置的后续工程 .它的建造目的是将重离子束的能量提高到 1 Ge V/u附近 ,同时利用储存环电子冷却技术将束流品质提高一个数量级 ,并提供更多种类的重离子束 ,以开展更广范围和更高精度的物理实验 .兰州重离子加速器冷却储存环是一个双储存环系统 ,由一个主环和一个实验环构成 .对其总体布局、总体参数、主要功能进行了介绍. HIRFL- CSR, a new accelerator project at the Heavy Ion Research Facility in Lanzhou (HIRFL), is a multipurpose Cooling Storage Ring system which consists of a main ring (CSRm) and an experimental ring (CSRe). Beams from HIRFL will be accumulated and accelerated in CSRm, and then transported to CSRe for internal target experiments. The layout, major parameters and main functions of the CSR were described.
兰州重离子加速器冷却储存环束流累积研究
原有进, 夏佳文, 张文志, 宋明涛, 杨晓东
2001, 18(1): 39-42. doi: 10.11804/NuclPhysRev.18.01.039
摘要:
对兰州重离子加速器冷却储存环加速器主体的主要功能环——主环的束流累积方法和设计进行了研究 .为了使主环对不同种类的重离子束流都具有较强的累积能力 ,在设计时考虑采用电子冷却参与下的两种束流累积方法 :多次多圈注入和射频堆积 .对这两种方法 ,电子冷却的冷却时间都是将束流累积到高流强的关键因素. The beam accumulation methods of HIRFL CSR(Heavy Ion Research Facility of Lanzhou and Cooler Storage Rings) project were studied. Two accumulation methods will be adopted to increase the beam intensity of CSRm. For both multiple multi turn injection method and RF stacking method, electron cooling of beam plays an important role.
SSC注入系统能量接收范围的研究
丁原涛, 王义芳, 刘巍, 朱昆
2001, 18(1): 43-46. doi: 10.11804/NuclPhysRev.18.01.043
摘要:
分析了影响 SSC注入能量的因素和 SSC注入系统适应能量变化的能力 ,计算了在理论等时场下 SSC注入系统对 3种典型离子 O8+,Xe22 +和 Ar15+的能量可接收范围 ,找出了加速较轻的重离子时束流损失较大的部分原因. The SSC injection system and the factors which influence the injecting beam energy were described and the capability of the SSC injection system for accepting the mismatching injecting beam energy was calculated. For most cases, small difference exists between the values of actual injecting beam energy and the theoretical requirements. The capability of accepting three typical particals: O8+ , Xe 22+ and Ar15+ were calculated for the SSC injection stystem with small variation of the in...
SFC新谐波电源的研制
王义芳, 陈明朗, 王贵文, 苏雅龙, 金乾刚
2001, 18(1): 47-49. doi: 10.11804/NuclPhysRev.18.01.047
摘要:
简要描述了扇聚焦回旋加速器 (SFC)中使用谐波场的意义和对谐波电源的要求 .根据长期运行的经验 ,对原有谐波电源的缺点和不方便处进行了分析 .在此基础上 ,提出了使用稳流电源和控制系统相结合的方法提供所要求的谐波电流 .描述了新电源的优点 ,在运行过程中也充分显示了它的优越性. The significance of using a harmonic magnetic field in SFC (Sector Focusing Cyclotron) and the requirements for the harmonic power supplies are described roughly. According to the experience of the operation in the long period, the shortages and some un conveniences for the original harmonic power supply were analyzed. In the case, a new kind of harmonic power supply was fabricated successfully in which the DC power supplies and the control technology were. ...
交叉学科
金属材料中氦的扩散与氦泡的形核生长研究
张崇宏, 陈克勤, 王引书, 孙继光
2001, 18(1): 50-55. doi: 10.11804/NuclPhysRev.18.01.050
摘要:
简述了金属材料中氦聚集行为的研究概况 ,特别是本课题组近年来对奥氏体不锈钢中氦扩散及氦泡形核生长机制的研究结果 ,并提出了这个领域有待解决的问题. Studies of diffusion and aggregation behaviour of helium in metallic materials are very important to solve the problem of helium embrittlement in structural materials used in the environment of nuclear power. Experimental studies on helium diffusion and aggregation in austenitic stainless steels in a wide temperature range have been performed in our research group and the main results obtained are briefly summarized. The mechanism of nucleation growth of helium bubbles has been...
重离子注入生物和药物分子的质量沉积研究技术
袁世斌, 卫增泉
2001, 18(1): 56-59. doi: 10.11804/NuclPhysRev.18.01.056
摘要:
介绍了我国在重离子束生物学这门新兴交叉学科领域已经取得的一系列领先成果 ,首次提出了重离子束生物效应系能量沉积、质量沉积、电荷交换和动量传递四者综合作用的结果 .过去的研究已初步证实了重离子注入生物和药物小分子所引起的质量沉积过程 ,并在此基础上开展了重离子注入生物和药物分子改性的研究 .将来可先应用稳定性和放射性重离子束注入生物和药物分子 ,然后用X射线衍射、电子显微镜放射自显影和图像处理等技术对重离子注入质量沉积开展进一步的研究. Heavy ion beam biology is a jumped up scientific subdivision. China acquired a series of prior achievements and for the first time brought forward the idea that heavy ion biological effects are the integrated results of the four effects, i. e. energy deposition, mass deposition, charge exchange and momentum transfer. Researchers have validated the mass deposition process in small biomolecules and pharmic molecules induced by heavy ion implantation, and researches on modification of...
用于洁净核能源的ADS-EA方案
李浩虎, 唐靖宇, P.Mandrillon
2001, 18(1): 60-64. doi: 10.11804/NuclPhysRev.18.01.060
摘要:
加速器驱动系统 (ADS)是一种新型的洁净能源装置 ,它采用加速器提供的强流高能量质子束驱动次临界的核反应堆 ,既有安全可靠和产生核废料少的优点 ,还可以处理传统反应堆留下的核废料 .能量放大器是一个基于回旋加速器组合的 ADS方案 ,由三级回旋加速器组成的加速器系统可以产生流强为12 m A和能量为1 .2 Ge V的质子束 (束流功率1 4.4MW) ,用以驱动1500 MW的核反应堆. Accelerator Driving System (ADS) is a new device for cleaning energy. A high intensity, high power proton beam provided by accelerators is used to drive a sub critical nuclear reactor. It is safe, reliable and can produce less nuclear waste, and also can be used to treat the nuclear waste from the classical reactor. An Energy Amplifier (EA), which is composed of three cyclotrons, is one type of ADS. It will be used to produce 14.4 MW proton beam (12 mA, 1.2 GeV) and to operate a 1 500 MW nuclear reactor.