Evaluation of Be and Li cross section data up to 200 MeV

Abstract

Nuclear cross section data on lithium and beryllium isotopes are evaluated in the incident energy up to 200MeV for proton and neutron incidence. For the first step for overall evaluation, parameters for phenomenological optical potential are obtained. Evaluated cross sections include neutron total cross section, total reaction cross section, angular differential elastic scattering cross section, nonelastic cross section. Both lithium and beryllium play an important role as a neutron converter for the boron neutron capture therapy (BNCT) using a proton accelerator. Beryllium is also one of essential materi- als as a target window and a reflector for a spallation neutron source. Evaluated nuclear data for these nuclei are contained in the energy region below 20MeV in the JENDL (1) at the moment and those in higher energy region are desired for such kinds of application. In this study, nuclear cross section data on Li and Be isotopes are evaluated in the incident energy up to 200MeV for proton and neutron incidence as the first step of overall evaluation. The evaluated cross section data include neutron total cross section, total reaction cross section, angular differen- tial elastic scattering cross section, nonelastic cross section and double differential secondary particle production cross section. The phenomenological optical model parameters are found to give good agreement with experimental data of total, elastic- and nonelastic-scattering cross sections. These evalu- ated cross sections are compared with available experimental values. The evaluated nuclear data will be merged into the JENDL High Energy File (JENDL-HE) (2) in the near future after evaluation of particle emission cross sections by the GNASH code (3).