Thermal neutron scattering data for 7LiF and BeF2

Jia Wang,Zehua Hu,Tao Ye,Weili Sun,Hongzhou Song

doi:10.1051/epjconf/201714613009

Jia Wang, Zehua Hu + Show 3 more

Open Access

https://doi.org/10.1051/epjconf/201714613009

Copy DOI

Abstract

Based on the coherent elastic, incoherent elastic, coherent inelastic and incoherent inelastic scattering processes, a code named SIRIUS is developed to produce thermal neutron scattering data for crystals in ENDF-6 format. The phonon band structures and projected phonon densities of states of 7 LiF and BeF2 crystals were calculated by Hellman-Feynman Theorem combined with a lattice dynamics direct method. Finally the thermal neutron scattering data for 7 LiF and BeF2 crystals are given.

Highlights

Thermal neutron scattering data are widely used in nuclear engineering applications, such as reactor design, radiation shielding, long-lived nuclear waste transmutation, Boron Neutron Capture Therapy.The study of thermal neutron scattering started from 1950s, which is due to the needs of the reactor design
Mei and Cai applied the CASTEP code and the modified NJOY code to generate the thermal neutron scattering data for LiF and BeF2 crystals [8] and investigated the thermal neutron scattering data for molten salt Flibe based on the dynamic performance for Flibe [9]
No thermal neutron scattering data in the ENDF format are available for Beryllium fluoride and Lithium fluoride

Summary

Introduction

Thermal neutron scattering data are widely used in nuclear engineering applications, such as reactor design, radiation shielding, long-lived nuclear waste transmutation, Boron Neutron Capture Therapy. LEAPR module in NJOY [3, 4] code is widely used to calculate ENDF-6 format thermal neutron scattering law (TSL) data. New requirements for the development of current nuclear engineering, especially for the fourth generation reactor design need more TSL data. In molten salt reactor, TSL data for Beryllium fluoride and Lithium fluoride are needed. No thermal neutron scattering data in the ENDF format are available for Beryllium fluoride and Lithium fluoride. A code named SIRIUS [10] is developed at IAPCM to generate the thermal neutron scattering data for solid in ENDF-6 format. SIRIUS code is utilized to calculate the thermal neutron scattering data of 7LiF and BeF2 crystals

Theoretical models

The phonon density of states

Thermal neutron scattering data

Conclusions