50,52,53,54Cr光核反应数据评价

通过分析光子诱发52,50Cr核反应的各类实验数据，澄清52Cr光子吸收截面评价数据与中子、质子出射截面测量值间的分歧，给出了52Cr中子出射截面实验数据的修正；选取EGLO模型光子强度函数，结合准氘模型，给出光子吸收截面。在此基础上，采用最新研制的光子与中重核反应计算程序MEND-G，通过优化理论模型参数，包括剩余核的能级密度和对能修正参数，给出光子能量在200 MeV范围内的n、p、${{\rm{\alpha }}}$等粒子出射核反应的截面，52,50Cr的计算结果在30 MeV以下能区很好地符合了现有实验数据，并按国际标准ENDF/B-6库格式给出了50,52,53,54Cr的全套数据文档，便于核工程用户使用。

Evaluations of Gamma Induced 50,52,53,54Cr Reactions

By analyzing the experimental data of ${\rm{\gamma }}+^{50,52}$Cr, the divergence between the absorption cross section and measurements of neutron and proton emission cross sections was clarified, the correction of neutron emission cross section of 52Cr was given. The EGLO model of photon strength function was selected to describe the absorption cross section. Combined with the quasideuteron contribution, the evaluation of photon absorption cross section was given. MEND-G code has been newly developed for calculating gamma induced medium heavy nuclear reactions. By optimizing the theoretical parameters, the cross sections of n, p, ${\rm{\alpha }}$, etc. in the range of 200 MeV were given. The results of this work were in good agreement with the main measurement of neutron and proton emission below 30 MeV. All data of ${\rm{\gamma }}+^{50,52,53,54}$Cr have been output in ENDF/B-6 format, which was convenient for nuclear engineering.