Photo-neutron Cross Section Calculations of Several Structural Fusion Materials

摘要

In this study, the theoretical photo-neutron cross-sections produced by (γ,n) reactions for several structural fusion materials such as ~(51)V, ~(55)Mn, ~(58)Ni, ~(90,91,92,94)Zr, and ~(181)Ta have been investigated in the incident energy range of 7-40 MeV. Reaction cross-sections as a function of photon energy have been calculated theoretically using the PCROSS and TALYS 1.2 computer codes. TALYS 1.2 default and pre-equilibrium models have been used to calculate the pre-equilibrium photo-neutron cross-sections. For the reaction equilibrium component, PCROSS Weiss-kopf-Ewing model calculations have been preferred. The calculated results have been compared with each other and against the experimental data in the existing databases EX-FOR and TENDL-2011. PCROSS Weisskopf-Ewing model calculations show a similar structure with experimental data but they are higher than the experimental values for all reactions except for ~(90)Zr(γ,n)~(89)Zr reaction. Generally, TALYS 1.2 default and pre-equilibrium model cross-section calculations are the best agreement with the experimental data for all reactions except for ~(58)Ni(γ,n)~(57)Ni reaction along the incident photon energy in this study. The TALYS 1.2 curves fit the TENDL-2011 data the best. If photo-neutron cross-section data is needed for an isotope where there is no experimental data available for comparison, TALYS 1.2 pre-equilibrium option has been recommended.