搜索结果: 136-150 共查到“知识库 中子物理学”相关记录654条 . 查询时间(0.695 秒)
NIST1577c牛肝标准参考物质的多元素中子活化分析
中子活化分析 标准参考物质 NIST1577c
2009/9/16
采用中子活化分析方法分析了美国NIST1577c牛肝标准参考物质。利用中国原子能科学研究院重水反应堆对样品进行辐照，采用高纯锗伽马谱仪对样品进行分析。采用有证标准物质NIST1577、1577a、1632c和1633a对牛肝样品分析进行质控，得到了参考物质的多元素分析结果。本实验测定的结果与NIST测定的结果在不确定度范围内一致。
Study of neutron response for two hybrid RPC setups using GEANT4 MC simulation approach
resistive plate chambers neutron sensitivity GEANT4 Monte Carlo simulation
2009/9/9
The present article describes a detailed neutron simulation study in the energy range 1010 MeV
to 1.0 GeV for two di erent RPC con gurations. The simulation studies were taken by using the ...
BEPCII 北对撞点辐射剂量的测量
辐射剂量 屏蔽厚度 光子背景 碘化钠探测器
2009/9/9
详细描述了辐射剂量测量的技术细节，报道了光子与中子辐射剂量的测试结果，并且基于简化的估算讨论了辐射防护的相关问题。此外，构建了碘化钠探测器，对于光子辐射水平进行了测量，由此获得了未来实验光子背景水平的定性估计。
多中子关联谱仪单块闪烁体特性的蒙特卡罗模拟
中子墙 蒙特卡罗模拟 中子晕核
2009/9/9
为了对丰中子核的破裂产物进行全动力学测量，北京大学准备建立一个多中子关联谱仪。 本文基于GEANT4开发的蒙特卡罗程序用来模拟谱仪中单块闪烁体的探测特性。该模拟程序实际考虑了带电粒子的能量沉积、闪烁体中的光传输及光在闪烁体两端的收集和信号转换等过程。其中具体的模拟方法在文中作了详细的介绍。借助此模拟程序我们给出了闪烁体的时间分辨、位置分辨和探测效率，并且跟实验结果进行了对比。同时本工作给出了一种新...
针对裂变源中子反射实验中涉及到的中子源能谱问题，选取两套用公式拟合、被普遍认可的252Cf自发裂变能谱，分别将其应用于该类实验的数值模拟中。对实验测点的中子注量及裂变反应率进行了对比研究，结果表明，相对于Maxwell谱，Watt谱能更好地与实验结果符合。
Am-Be中子源辐射场周围剂量当量与吸收剂量的计算
Am-Be中子源辐 比释动能系数
2009/8/25
根据最近更新的微观中子核反应截面数据（ENDF/B-Ⅶ库）计算了热中子到20MeV中子能区，H、C、N、O、Ar5种元素以及干燥空气和ICRU四元素组织的中子比释动能系数（kerma因子）。在此基础上，结合MCNP程序对Am-Be源外中子能谱的模拟，计算了Am-Be源中子场的周围剂量当量，单位中子注量下为373.0pSv•cm2。利用本实验室计算国产Am-Be源的中子能谱，算得相应中...
30MeV电子直线加速器脉冲中子注量率及剂量当量率的测定
中子注量率 脉冲 电子直线加速器 30MeV
2009/8/17
电子直线加速器的辐射场特点, 要求探测器在窄脉冲辐射场中有正确的剂量响应, 较高的n、γ分辨能力和抗电磁干扰能力. 本文中采用In活化探测器测量脉冲中子, 它能满足上述三点要求, 是一种可靠的方法. 此外, 该探测器结构简单, 造价低廉, 便于大量使用. 我们用它测定了30MeV电子直线加速器屏蔽墙内外中子注量率及剂量当量率的分布. 同时与TLD测量结果进行了比较. 最后, 讨论了轫致辐射的高能光...
Analytical and statistical calculation of gamma dose rate for the accident of losing the shield for Tehran Research Reactor
TRR gamma-ray dose rate MCNP4C
2009/8/17
In this paper we study the analytical and statistical results of estimating the gamma dose rate at pool access floor in TRR when the core shield accidentally decreases to some non-permitted levels. Du...
A formula used to subtract the effect of gamma-ray of the others to that ofmeasured reaction in measurement of cross section of nuclear reaction andits application
formula tellurium activation cross sections neutron-induced reactions HPGe detector
2009/8/17
According to the regulation of growing and decay of artificial radioactive nuclide, a formula used to subtract the effect of characteristic γ-ray of the others to that of measured reaction was deduce...
Configuration of the valence neutrons of 17B
valence neutron root-mean-square radius s-wave spectroscopic factor
2009/8/17
The reaction cross section of 17B on 12C target at (43.7±2.4)MeV/u has been measured at the Radioactive Ion Beam Line in Lanzhou (RIBLL). The root-mean-square matter radius (Rrms) was deduced to be (2...
Efficiency calibration of neutron detector array for β decay of exotic nuclei
neutron detector array efficiency calibration 17N 16C
2009/8/14
The research of the in-beam efficiency calibration of Neutron Detector Array of Peking University using 17N and 16C beams was introduced in this paper. The efficiency of neutron wall and ball are comp...
Langevin study of neutron emission in the reactions 16O+181Ta and 19F+178Hf
pre-scission neutron multiplicity entrance channel mass asymmetry compound nucleus spin distribution Langevin equation
2009/8/14
The pre-scission neutrons measured in the reactions 16O+181Ta and 19F+178Hf are studied via a Langevin equation coupled with a statistical decay model. We find that because of the mass asymmetry of di...
Development of a facility for research of charged particle emission induced by fast neutron reactions
intermediate energy neutron (n x) reaction ΔE-ΔE-E telescopes
2009/8/14
A facility has been constructed for research of charged particle emissioninduced by fast neutron reactions ((n, x) reaction) based on the whiteneutron source and the quasi-monoenergetic neutron source...
Effect of entrance-channel asymmetry on the isospin dependence of nucleon emission in heavy ion collisions
neutron to proton ratio symmetry energy isospin asymmetry of reaction system hadronic transport model
2009/8/14
Using the isospin- and momentum-dependent hadronic transport model IBUU04, we have investigated the influence of the entrance-channel isospin asymmetry on the sensitivity of the pre-equilibrium neutro...