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2012年  第29卷  第1期

核物理
相对论重离子碰撞中的重味产生
刘云朋, 庄鹏飞
2012, 29(1): 1-13. doi: 10.11804/NuclPhysRev.29.01.001
摘要:
重味粒子是新的物质形态——夸克胶子等离子体的敏感探针。 利用相对论流体力学描述夸克胶子等离子体的时空演化, 采用输运方程模拟重味粒子在夸克胶子等离子体中的运动, 既考虑重味粒子的热胶子离解, 也通过细致平衡原理包含重味粒子在热密媒质中的重产生。 正是由于离解与重产生之间的竞争以及竞争对于碰撞能量、 横动量和快度的依赖性, 自然解释了在RHIC能区的J/ψ疑难, 预言了在LHC能区由于重产生取得主导地位, J/ψ的核修正因子在中心和半中心碰撞中将随着参与反应核子数的增大而升高, 同时其平均横动量会受到强烈的压低。 Heavy quarkonium is a sensitive signature of the new state of matter-quarkgluon plasma produced in high energy nuclear collisions. We describe the spacetime evolution of the quarkgluon plasma by relativistic hydrodynamic equations and the quarkonium motion by transport equation. We found that the competition between the gluon dissociation and regeneration can explain naturally the J/ψ puzzles at RHIC energy. We predict the increase of the nuclear modification factor in semicentral and central collisions and the related transverse momentum suppression at LHC energy.
非对称核物质中核子动量分布的微观理论计算(英文)
李建洋, 左维, 曹高清, U. Lombardo
2012, 29(1): 14-20. doi: 10.11804/NuclPhysRev.29.01.014
摘要:
在Extended BruecknerHartreeFock(EBHF)近似下, 采用Argonne V18势作为核子核子相互作用, 计算了基态非对称核物质中核子动量的分布。 对核子的动量分布对同位旋不对称度的依赖关系进行了描述和讨论。 结果表明, 在不对称度为零时, 质子与中子有着基本相同的动量分布。 随着不对称度的增加, 在各自的费米面以下, 质子动量分布减小而中子动量分布增大。 对费米面处的准粒子强度也进行了计算和讨论。 本结果较好地满足了两个理论检验标准MigdalLuttinger theorem 和粒子数守恒律。
We calculate the momentum distribution of nucleons in asymmetric nuclear matter within the framework of the extended BruecknerHartreeFock approximation at zero temperature, use Argonne V18 potential as two nucleons potential. The isospinasymmetry dependence of the nucleon momentum distribution predicted and discussed. It is shown that as the asymmetry increases, the proton momentum distribution become smaller while the neutron one gets higher below their respective Fermi surfaces with respect to their common values in symmetric nuclear matter. The quasiparticle strength at the Fermi momentum also calculated and discussed, we got an improved fulfillment of the Migdal Luttinger theorem and nucleon number conservation.
密度分布对原子核阻止同位旋效应的影响
张凡, 郭文军, 张霄吉, 倪晟
2012, 29(1): 21-24. doi: 10.11804/NuclPhysRev.29.01.021
摘要:
利用同位旋相关的量子分子动力学(IQMD)模型,分析了中能重离子碰撞过程中相对论平均场和SkyrmeHartrere-Fork等核结构模型给出的核密度分布对原子核阻止的影响。研究表明,从费米能到的较大能量范围内,无论小质量体系还是大质量体系,原子核阻止对同位旋相关的核子-核子碰撞截面都非常灵敏,而不同模型给出的核密度分布对原子核阻止影响不大,说明原子核阻止作为提取同位旋相关核子-核子碰撞截面的灵敏探针是与原子核结构模型无关的。 Influence of densitydistributionwhichisgivenbyRMFandSkyrme-Hartrere-Fork etalnuclearstructuremodelonnuclearstoppinginheavy-ioncollisionsatintermediateenergiesarestudiedbyusingisospin-dependentquantummoleculardynamics(IQMD)model.ResearchshowsthatrangeformtheFermienergytothelargerenergyof 100 Mev/u, for bothsmallandlargemasssystem,nuclearstoppingisfoundtobestronglydependentonthenucleon-nucleoncrosssections,andweaklyondifferentdensitydistribution.ThisshowsthatnuclearstoppingcanbeusedasaprobetoextracttheinformationontheisospindependenceN-Ncrosssectionsandhasnorelationshipwithnuclearstructuremodels.
低能重离子诱导反应中轻带电粒子和蒸发剩余物的能谱(英文)
吕绮雯, 卫华荣, Rahim Magda A., Fakhraddin S., 刘福虎
2012, 29(1): 25-35. doi: 10.11804/NuclPhysRev.29.01.025
摘要:
在多源理想气体模型的框架内, 用一个关于末态粒子多重数分布的统一描述, 研究了低能重离子诱导反应中轻带电粒子和蒸发剩余物的能谱。 在同一个激发的复合核中, 每个源对带电粒子和蒸发剩余物均贡献一个指数分布的能谱。 计算结果与158, 170, 180 和 200 MeV 20Ne+12C 反应中, 轻带电粒子和蒸发剩余物能谱的实验结果符合。
高能重离子碰撞中产生的末态粒子的横质量谱(英文)
谢文杰
2012, 29(1): 36-44. doi: 10.11804/NuclPhysRev.29.01.036
摘要:
基于多源理想气体模型, 用两个方程分别描述了高能重离子中心碰撞中产生的p, K±和π±的横质量分布。在忽略末态粒子的相对论效应的情况下, 除π±外, 计算结果可近似地描述实验结果。考虑了源的次级样本后, 发现计算结果与高能Au-Au和Pb-Pb中心碰撞的实验结果符合得较好。 Based on the multisource ideal gas model, which do not consider the dynamic mechanism of particles, two formulae are given to describe the transverse mass distributions of protons, kaons and pions produced in central heavy ion collisions at high energies. In the case of neglecting the relativistic effect, our calculated results approximately describe the experimental data, except for pions. By considering the subsamples of the sources, it is found that our calculated results are in good agreement with the experimental data in the central AuAu and PbPb collisions at high energies.
139Pm核中磁转动带的研究
张宁涛, 张玉虎, 周小红, 柳敏良, 郑勇, 郭应祥, 雷祥国, 丁兵, 胡钧, 马飞, 陈亮, 王世陶, 吴晓光, 郑云
2012, 29(1): 45-51. doi: 10.11804/NuclPhysRev.29.01.045
摘要:
通过重离子熔合蒸发反应116Cd(27Al, 4n)布居了139Pm的高自旋激发态,用12台高纯锗探测器(HpGe)阵列进行了在束γ-γ 符合测量。 基于γ-γ符合关系及139Pm核已知的能级信息,建立了两条ΔI=1的负宇称带。 利用相邻核能级结构的系统性和依据半经典的核子-核子有效作用的理论模型(SPAC)对这两条带能级结构进行了定量计算, 认为它们属于磁转动带。 Highspin states in 139Pm have been studied via the116Cd(27Al, 4n) heavyion fusionevaporation reaction. The γ-γ coincidences were measured with 12 HpGe detectors. Based on γ-γ coincidence relationships and previously known levels in 139Pm, two ΔI=1 negativeparity bands have been established. From the systematic comparison with the neighbouring nuclei and semiclassical effective interaction model (SPAC) calculations, the two bands were suggested as magnetic rotational bands.
(sNN)1/2=200 GeV的d+Au碰撞中末态带电粒子赝快度分布的对心度依赖性
娄小辉, 姜志进, 李庆广
2012, 29(1): 52-56. doi: 10.11804/NuclPhysRev.29.01.052
摘要:
将核子-核子碰撞末态带电粒子的生成源分为二元核子核子碰撞与带头粒子两部分, 给出了末态带电粒子的赝快度分布与入射能量间的解析关系。 以此为基础, 将核核碰撞末态带电粒子的生成源分为二元核子-核子碰撞、 带头粒子与旁观者3部分, 建立起了以碰撞参数与束流能量为自变量的末态带电粒子的赝快度分布, 并用其分析了BNL-RHIC-PHOBOS合作组在sNN=200 GeV的不同d+Au对心度碰撞中所做的实验测量。 所得结果与实验符合得很好。 We divide the particle generating sources in nucleon-nucleon collisions into two parts: binary collisions and leading particles, and present the analytical relation between chargedparticle pseudorapidity distributions and incident energy. On the basis of this work, we classify the particle generating sources in nucleus-nucleus collisions into three parts:binary collisions,leading particles and spectators,and formulate the chargedparticle pseudorapidity distributions as the function of incident energy and impact parameter. We then analyze with the model the experimental measurements in d+Au collisions at sNN=200 GeV. The theoretical results are well consistent with experimental data.
拓展的Skyrme模型中的Skyrmion与其量子化
张金虎, 贾多杰, 王晓维, 卢一平
2012, 29(1): 57-61. doi: 10.11804/NuclPhysRev.29.01.057
摘要:
考察了包含手征流非对易项的拓展Skyrme模型。 在推导出相应Skyrme模型运动方程的基础上对模型中的球对称Skyrmion孤子进行了数值模拟。 对模型进行零模(Zero-mode)量子化之后, 计算核子的若干静态性质, 并讨论了拓展Skyrme模型中手征流非对易项与QCD之间的联系。 This paper considers the extended Skyrme model with the anticommutator of the chiral current. By deducing the equations of motion of extended Skyrme model, the spherically symmetric Skyrmion was numerically simulated. After the Zero-mode quantization of the model, the static properties of nucleons were calculated and the connection of the anticommutator of the chiral current with QCD was discussed.
加速器
HITFiL中能束运线的纵向匹配
谢修璀, 宋明涛, 郝焕锋, 王贤武
2012, 29(1): 62-66. doi: 10.11804/NuclPhysRev.29.01.062
摘要:
基于中国科学院近代物理研究所正在研制的兰州重离子治疗专用装置(HITFiL)的参数和指标, 对从回旋加速器到同步加速器之间中能传输段的纵向束流匹配过程进行了模拟分析。 根据主加速器的注入要求, 在束运线上采用了散束器以降低束流动量分散,从理论上分析了中能传输段末端可能实现的最小动量分散和达到最小动量分散的条件,讨论了散束效果与初始动量分散、 束团相宽和漂移长度的关系。 并利用MathCAD程序对束团在束运线上的纵向运动进行了跟踪模拟,使用PBOLab程序进行了验算, 得到了当散束器射频电压为102 kV时,末端动量分散为最小值2.764×10-4。 进一步提出了中能传输段的基本参数,也为下一步的优化设计提供了基础。
Based on the parameters of the Middle Energy Beam Transport (MEBT) of the Heavy Ion Therapy Facility in Lanzhou (HITFiL), which is now under design and construction at the Institute of Modern Physics, Chinese Academy of Sciences (IMPCAS), a debuncher will be used to reduce the momentum spread for the injection requirement of the synchrotron according to the injection demand of the synchorotron. Both analytical model and tracking simulation with MathCAD are used for the choice of debuncher’s parameters. The conclusion shows that the effective cavity voltage of the debuncher is 102 kV and the minimum finial momentum spread is 2.764×10-4.
5T有源屏蔽式超导磁体结构设计
郭永超, 张小奇, 马力祯, 吴巍, 吴锡, 张晓鹰
2012, 29(1): 67-71. doi: 10.11804/NuclPhysRev.29.01.067
摘要:
介绍了为兰州Penning离子阱项目专门设计的5T有源屏蔽式超导磁体。 为达到物理设计要求的场均匀度, 超导磁体有3层共计6个线包组成。 同时为了确保线圈绕制的定位精度和在强磁场下的稳定性, 绕制骨架采用三筒体结构, 模拟计算表明线圈的绝缘和固定结构能够达到强磁场下的电气和机械性能要求。 对5T有源屏蔽式超导磁体结构设计材料选择以及线圈的绕制工艺进行了详细的论述。 A 5T actively shielded superconducting magnet was designed for Lanzhou Penning Trap project. In order to achieve homogeneity of physical requirements, superconducting magnet was made up of six coils, which were wound on framework of three layers. Meanwhile, three framework structure can ensure the precision of coil winding and the mechanical stability under intense magnetic field. The results of simulation show that the insulation and fixed structure of the coil can satisfy the electrical and mechanical requirements under intense magnetic field. At last, properties of the used materials and coil fabrication have been presented.
核技术
一种用于RIBLL2的纵向场多次取样型电离室
唐述文, 段利敏, 孙志宇, 马朋, 鲁辰桂, 杨贺润, 张金霞, 胡正国, 徐瑚珊
2012, 29(1): 72-76. doi: 10.11804/NuclPhysRev.29.01.072
摘要:
为兰州第二条放射性束流线(RIBLL2)研制了一台用于ΔE测量的纵向场多次取样型电离室。 利用3组分α源(239Pu为3.435 MeV, 241Am为3.913 MeV, 244Cm为4.356 MeV)对取样单元进行了测试, 确定了电离室的最佳工作电压为-500 V, 沉积能量为3.435 MeV时, 取样单元的能量分辨为271.4 keV(FWHM)。 利用Geant4对此电离室的整体性能进行了模拟, 表明可以对Z≥4的离子实现较好的粒子鉴别。 A longitudinal field MUltiple Sampling Ionization Chamber (MUSIC), which makes multiple measurements of energy loss for very high energy heavy ions at RIBLL2, has been constructed and tested with 3 constituent α source (239Pu: 3.435 MeV, 241Am: 3.913 MeV, 244Cm: 4.356 MeV). The voltage plateau curve has been plotted and -500 V is determined as a proper work voltage. The energy resolution is 271.4 keV FWHM for the sampling unit when 3.435 MeV energy deposited. A Geant4 Monte Carlo simulation is made and it indicates the detector can provide unique particle identification for ions Z≥4.
被动法高浓铀年龄测量技术研究
张宏俊, 任忠国, 胡碧涛, 熊忠华, 何西尧, 莫钊洪, 刘振汉, 赵德山
2012, 29(1): 77-80. doi: 10.11804/NuclPhysRev.29.01.077
摘要:
利用HPGe-γ谱仪测量了多个年龄段的HEU样品, 获得了样品中N(214Bi)/N(234U)的值, 从而计算得到了HEU的年龄,其测量结果与参考值吻合较好。最后结合实验结果,系统分析了其它可能用于测量高浓铀年龄的方法,并对各种方法的可行性进行了分析。 结果表明, 214Bi/234U比值法是最佳的选择。N(231Pa)/N(235U)法中对γ谱如何解谱还需作进一步研究。 The HEU sample was measured by HPGe- γ spectrometry. By analyzing the detected γspectrum, the N(214Bi)/N(234U) of the HEU sample was acquired, and the age of HEU samples was determined, which was coincided with the reference value. At last, the other potential methods of determining the age of HEU were analyzed systematically. N(214Bi)/N(234U) is more feasible,and algorithm of spectrumdecomposition in N(231Pa)/N(235U) should be studied further.
小直径石油测井中子发生器研制
肖坤祥, 艾军, 史桂娟, 向伟, 梁川, 梅林
2012, 29(1): 81-84. doi: 10.11804/NuclPhysRev.29.01.081
摘要:
为满足国内油田石油测井的迫切需要, 对小直径测井中子发生器进行了研发。 该发生器离子源采用微型化冷阴极Penning离子源, 离子光学采用结构简单的单极加速系统。 经实验室测试和用户现场刻度及测井表明, 研制的中子发生器具有耐高温、 产额高、 稳定性好等特点, 是目前国内研制的最小直径的工业测井中子发生器。 所测数据与其它测井方法相比较, 地质资料符合性好, 满足了用户测井要求, 现已用于油田生产测井。
A small neutron generator has been developed for meeting the need of well logging in oil fields. The miniature cold cathode Penning ion source and single electrode ion optics system are used in neutron generator. The good performance of the generator has been proved in the laboratory test and well logging in oil field. The generator has good characteristics, such as small diameter, high temperature resistant,high neutron output and good stability. At present, the neutron generator is the smallest logging generator in China, which has been used in oil field generally for conforming the geological data.
交叉学科
材料中氦泡迁移-融合的蒙特卡罗模拟及其参数优化
李仁顺, 周宇璐, 汪俊, 侯氢
2012, 29(1): 85-91. doi: 10.11804/NuclPhysRev.29.01.085
摘要:
基于迁移-融合机制, 建立了一套用于模拟材料中氦泡生长行为的蒙特卡罗程序, 探讨了时间步长等控制参数对演化的影响。 研究指出,在考察此类参数对计算的影响时必须考虑氦的初始分布,另外指出在选取邻居半径时除了要考虑到初始分布外还要考虑邻居更新的快慢。 The evolution of helium bubbles in materials has been simulated by Monte Carlo methods based on the migrationcoalescence mechanism. The influences of simulation parameters on the results are studied. It is found that the initial depth distribution must be considered when assessing the parameters influence, and the frequency of updating neighbor list should also be taken into account when selecting the cutoff range for neighbors.
辐照诱变对小麦生理学效应的影响
张佳佳, 代西梅, 赵帅鹏, 陈雪能
2012, 29(1): 92-96. doi: 10.11804/NuclPhysRev.29.01.092
摘要:
以小麦品种小偃81为材料, 利用低能N+离子, 60Co-γ射线以及紫外线UV-C等为诱变源, 对种子胚部进行辐照处理。 研究其对小麦发芽势、 发芽率、 根长及苗高等生理指标的影响。 以辐照后的幼苗为材料研究了低能N+注入对过氧化氢酶(CAT)、 过氧化物酶(POD)、 超氧化物歧化酶(SOD)活性及还原型谷胱甘肽(GSH)含量的影响。 研究结果表明: N+注入后种子活力先升高后降低, 苗高在5×1017 N+/cm2时显著低于对照; 60Co和紫外线辐照对种子活力有较显著的影响, 辐照后的根长和苗高均显著低于对照; N+束辐照后的幼苗CAT酶活随剂量的变化规律性不明显, POD和SOD酶活总体趋势随剂量的增加先升高后降低, GSH含量随剂量的增大先降低后升高。 由此可知, 辐照诱变可以诱导小麦一系列的生理变化。60Co-γ射线和紫外线UVC对小麦胚根的伤害较大, 导致幼苗在后期大量死亡。N+注入对小麦的损伤效应较60Co和紫外线γ射线和紫外线UV-C小, 一定注量的N+注入处理可促进小麦生长。 In this paper, the biological effects,such as germination percentage, germination index and the length of seedlings and roots were investigated by using lowenergy N+, 60Co- γ rays and ultraviolet UVC to irradiate the embryos of wheat seeds (Xiaoyan81). The anti oxidative enzyme system (CAT,POD, SOD) and GSH content were studied as well. The results show that the vitality of seed increased and then reduced with increasing the dosage of N+ ion implantation. The length of roots and seedlings were significantly higher than control. The seed vigor was significant effected after irradiated by 60Co-γrays and ultraviolet UV-C, but the length of roots and seedlings were significantly lower than control. After N+ implantation, the changing pattern of CAT was not obviously. The enzymatic activity of POD and SOD were increased at low dosage and reduced at high dosage. The content of GSH was reduced and then raised. The results proved that the damage induced by γray and UVC to the radicle of wheat was severe that result in a large number of seedling died. However the damage induced by N+ implantation was lower than that by rays and UVC irradiation. Certain dosage of ion implantation can promote the growth of wheat.

3D组织培养模型及其在辐射诱导旁效应研究中的应用
吴汝群, 许安, 吴李君, 胡步荣
2012, 29(1): 97-102. doi: 10.11804/NuclPhysRev.29.01.097
摘要:
综述了3D细胞培养技术(TDCC)的发展, 3种主要的体外组织构建方法; 辐射诱导2D细胞产生旁效应的现象与机理; 人工构建的3D组织辐射后诱导的旁效应及其细胞间信号传导机理。 重离子(C离子)辐照作为一种重要的放疗工具, 对其辐射处理3D组织后诱导产生的旁效应进行了展望。 由于3D组织更接近人体细胞生长的真实环境, 因而以3D组织作为模型研究辐射诱导的旁效应, 对于辐射旁效应的防护和治疗可能具有重要的指导意义。 Compared with the cultured monolayer (2D) cells, threedimensional (3D) tissue could be more similar to the environment in vivo including the physical support, chemical factors, cellcell and cellmatrix interaction and so on. With the development of threedimensional cell culture techniques (TDCC), 3D tissue is widely used in the areas of bystander effect research. This review focuses on introducing the TDCC method and its application in bystandereffect research. First, the development process of 3D tissue culture method was introduced. Secondly, the induction of radiation induced bystander effects both in 2D cell and 3D tissue and its mechanisms were reviewed. Finally, because heavy ion (carbon ion beam) has been developed as a useful tool to cure solid cancer ,and the 3D tissue model is an ideal material to study the damages on body after being irradiated and to understand the underlying mechanisms, future study about heavy ion radiation inducing bystander effect in 3D tissue was discussed.
p73变异体研究现状及其在肿瘤放疗中的应用前景
狄翠霞, 张红, 王振华
2012, 29(1): 103-108. doi: 10.11804/NuclPhysRev.29.01.103
摘要:
p73基因是p53抑癌基因家族的新成员。 p73有两组蛋白异构体: TAp73和DNp73。 TAp73具有诱导细胞周期停滞和细胞凋亡的能力, 而DNp73却有与之相反的能力, 具有肿瘤促进作用。 对p73基因两面性的特点及研究进展作一综述。 最后结合重离子治疗肿瘤, 探讨了p73联合重离子治疗的新思路。 p73 was the first identified homologue of the tumor suppressor gene, p53. p73 has two groups of protein isoforms: TAp73 and DNp73. TAp73 can induce cell cycle arrest, resulting in the ability of apoptosis, however DNp73 has antagonistic property of a tumor promoting effect. In this paper, the dual roles of p73 gene and its research progress was reviewed. Finally, combined with heavy ion treatment of tumor, we explored some new ideas of p73heavy ion joint therapy.
GANRA类药物的抗辐射效应研究
朱明月, 裴海龙, 叶文凌, 张亚楠, 丁楠, 王菊芳, 李文建, 周光明
2012, 29(1): 109-113. doi: 10.11804/NuclPhysRev.29.01.109
摘要:
以昆明小鼠为实验模型, 连续进行GANRA类药物灌胃3 d后, 使用8 Gy 100 kVp的X射线进行辐照处理, 然后对血象、 脏器指数、 小鼠存活率、 肝脏中丙二醛(MDA)含量以及超氧化物歧化酶(SOD)活性等参数进行了统计分析。 结果表明: (1) 药物灌胃对小鼠存活率没有影响。 辐照后, 小鼠存活率显著下降, 存活率下降至50%所需时间分别为: 照射对照组20 d、 DMSO组9 d、 1#药物组29 d、 5#药物组24 d; (2) 药物灌胃对小鼠脏器指数没有明显影响, 辐照后的对照组和DMSO组小鼠的肝脏指数、 脾脏指数升高, 药物组的脏器指数低于照射对照组和DMSO组; (3) 辐照导致各实验组的MDA水平升高、 SOD活性下降, 但是5#药物的SOD活性高于DMSO组、 MDA水平低于DMSO组; (4) 药物灌胃对小鼠血象没有产生明显毒性效应;辐照后各实验组小鼠的白细胞等都显著下降。 从上述实验结果可以看出, GANRA类1#和5#药物具有抗辐射作用, 其机制可能与GANRA类药物的自由基清除能力有关。 After three days of medicine administrated, Kunming mice were exposured to 8 Gy of 100 kVp Xrays. Hemogram, viscere, survival, MDA yields and SOD activity were examined. Results showes that, (1) Survival of medicineadministrated mice were similar to the control group. After irradiation, survival dropped significantly. It took 20 days for the control group to reach to 50% survival, while 9 days for DMSO group 29 days for 1# drug group, and 24 days for 5# drug group. (2) The medicine per se had no obvious impacts on visceral indexes. Liver index and spleen index of the control group and DMSO group were elevated after irradiated, while those of medicineadministrated group did not change much. (3) The groups treated by DMSO and 1# drug had high yield of MDA, but low activity of SOD. Compared with DMSO group, 5# drug had high SOD activity while low MDA level. Irradiation increased MDA level but decreased SOD activity of every group, However, 5# drug still showed higher SOD activity and lower MDA level than DMSO group. (4) The medicine did not show distinctive contributions to variation of hemogram. In summary, our results demonstrated that GANRAlike 1# and 5# medicine had radioprotective effects and their mechanisms might be related to the scavenging ability of free radicals.
核能与核数据
CFBR-Ⅱ堆脉冲状态反应性温度系数测量
高辉, 刘晓波, 蒋勇, 范晓强
2012, 29(1): 114-116. doi: 10.11804/NuclPhysRev.29.01.114
摘要:
反应性温度系数是脉冲堆重要参数之一, 采用一种特殊的方法测量了脉冲状态反应性温度系数。 把脉冲的全过程分为峰和坪两个过程, 根据Fuchs-Hansen模型知道脉冲峰过程的反应性减小量为系统初始超瞬发反应性的2倍, 采用脉冲波形去坪的方法分离出峰过程贡献的温升, 由此得到CFBR-Ⅱ堆的脉冲反应性温度系数αT=-0.00202 $/K。 Reactivity temperature coefficient is one of important parameters of burst reactor. The methods of measuring the coefficient were introduced and analyzed. The whole process of burst is split into “peak” process and “tail” process. Reactivity reduction is twice as large as initial excess reactivity in “peak” process from FuchsHansen model. Increment of temperature induced by “peak” process was got through removing “tail”. So we deduced reactivity temperature coefficient of CFBR-Ⅱ αT=-0.00202 $/K.