不同数据库中^(56)Fe评价截面对屏蔽计算影响研究

Research on the influence of ^(56)Fe evaluation cross section of different databases on shielding calculation

为了对各类评价库中^(56)Fe截面在屏蔽计算方面的适用性和精确度进行评估,选用FE DIA100 R150代表性基准题对不同评价库及同一评价库不同版本中^(56)Fe截面数据质量进行评价;并基于CENDL-3.2评价库,开展了对^(56)Fe的敏感性分析工作,主要对其关键反应道截面在屏蔽计算方面的影响进行研究。研究结果表明:(1)由于^(56)Fe的弹性散射截面和非弹性散射截面数据准确度的缺失,导致1.20~1.70 MeV、10.00~17.00 MeV等能区,各类评价库计算值与实验测量值差异均较大;(2)^(56)Fe中的(n,n)和(n,n′)d反应截面对屏蔽计算影响最为敏感;(3)CENDL-3.2中^(56)Fe(n,n)反应截面值在0.01~0.10 MeV能区较真实值截面值偏高。

^(56)Fe evaluation cross sections are still being updated at home and abroad.In order to evaluate the applicability and accuracy of ^(56)Fe cross sections in various evaluation libraries and different versions of the same evaluation library in shielding calculation,this paper selects the FE DIA100 R150 benchmark with the evaluation the cross-section data quality of ^(56)Fe in different evaluation libraries.And based on the CENDL-3.2 evaluation library,the sensitivity analysis of ^(56)Fe stable isotopes was carried out,and the influence of key reaction channel sections of ^(56)Fe on shielding calculation was studied.Some main conclusions are drawn as follows.1)Due to the lack of accuracy of the elastic scattering cross section and inelastic scattering cross section of ^(56)Fe,there are large differences between the calculated values of various evaluation libraries and the experimental measurements in the energy regions of 1.20-1.70 MeV and 10.00-17.00 MeV.2)The(n,n)and(n,n′)d reaction cross-sections in ^(56)Fe are the most sensitive factors to the influence of shielding calculations.3)In CENDL-3.2,the cross section value of ^(56)Fe(n,n)is higher than the real value in the energy region of 0.01-0.10 MeV.