Measurement and Analysis of Leakage Neutron Spectra from Spherical Assemblies of Chromium, Manganese and Copper with 14 MeV Neutrons
Measurement and Analysis of Leakage Neutron Spectra from Spherical Assemblies of Chromium, Manganese and Copper with 14 MeV Neutrons
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14 MeV 中子铬、锰、铜球形组件泄漏中子谱的测量和分析
DOI：
10.1080/18811248.2000.9714906
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发表时间：
2000
影响因子：
1.2
通讯作者：
A. Takahashi
中科院分区：
文献类型：
--
作者：
C. Ichihara;S. Hayashi;I. Kimura;J. Yamamoto;A. Takahashi
为了对现有现代评价核数据文件中Cr、Mn和Cu的核数据进行基准验证，利用OKTAVIAN强14 MeV中子源，采用飞行时间技术测量了球形样品堆在0.1 ~ 15 MeV能量范围内的泄漏中子能谱。为了定性地理解光谱对单个部分截面的依赖性，用蒙特卡罗中子输运程序MCNP-4A和几种修正的Mn截面进行了试算。用MCNP-4A和评价的核数据文件对实测光谱与理论计算光谱进行了比较。通过光谱形状和四个能区的C/E值进行比较。使用JENDL-3.2、JENDL Fusion File、FENDL-1.0和ef -2对Cr、Mn和Cu进行了计算，结果令人满意，只有少数例外。通过对试算结果的校核，认为这些差异是由于对二次中子的非弹性散射截面值和能量分布计算不当造成的。
In order to make benchmark validation of the nuclear data for Cr, Mn and Cu in existing modern evaluated nuclear data files, leakage neutron spectra in the energy range from 0.1 to 15 MeV from spherical sample piles were measured by a time-of-flight technique using intense 14 MeV neutron source, OKTAVIAN. To make a qualitative understanding of the dependence of the spectra on individual partial cross sections, a trial calculation was performed by Monte Carlo neutron transport code MCNP-4A along with several kinds of modified cross sections for Mn. The measured spectra were compared with those by theoretical calculation using MCNP-4A with the evaluated nuclear data files. The comparison was made by the spectrum shape and by the C/E values in four energy regions. The calculations for Cr, Mn and Cu using JENDL-3.2, JENDL Fusion File, FENDL-1.0 and EFF-2 give satisfactory predictions with a few exceptions. By checking the result of the trial calculation, it is considered that these disagreement is caused by improper evaluation either of inelastic scattering cross section values and/or energy distribution of secondary neutrons.