Evaluation of cross sections for fast ion reactions with beryllium in helium and hydrogen fusion plasmas

Abstract

To computationally support hydrogen and helium plasma discharges in the early stages of tokamak operation and to support the commissioning of the neutron detectors during these operational phases, creation of a realistic neutron and gamma ray particle source for Monte Carlo simulations will be needed. One of the most important parts of creating the particle source is calculating the reaction rates of the particle-emitting reactions to determine the emission profile in the plasma and the energy spectra of the emitted particles. In this paper the analysis and evaluation of cross sections for important neutron-emitting reactions, namely, ^9 Be(p,n γ ) ^9 B, ^9 Be( ^3 He,n γ ) ^11 C, and charged-particle emission reactions ^9 Be(p,d)2 α and ^9 Be(p, α ) ^6 Li that cause neutron emission in the next step of interactions are presented. The reaction cross sections were evaluated based on experimental measurements and empirical models describing the interaction of two charged particles. Evaluation of the associated uncertainties was also performed. The main goal of the work is to propose the newly evaluated cross sections for inclusion in the FENDL nuclear data library, thus making the cross section available to other researchers studying the above listed reactions.

Keywords

• cross section
• beryllium
• FENDL
• uncertainty
• evaluation