MeV Neutron Production from Thermal Neutron Capture in 6Li Simulated With Geant4

Valentina Santoro,Phillip M. Bentley,Douglas D. DiJulio

doi:10.1088/1742-6596/746/1/012012

Valentina Santoro, Phillip M. Bentley + Show 1 more

Open Access

https://doi.org/10.1088/1742-6596/746/1/012012

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Abstract

Various Li compounds are commonly used at neutron facilities as neutron absorbers. These compounds provide one of the highest ratios of neutron attenuation to y- ray production. Unfortunately, the usage of these compounds can also give rise to fast neutron emission with energies up to almost 16 MeV. Historically, some details in this fast neutron production mechanism can be absent from some modeling packages under some optimization scenarios. In this work, we tested Geant4 to assess the performance of this simulation toolkit for the fast neutron generation mechanism. We compare the results of simulations performed with Geant4 to available measurements. The outcome of our study shows that results of the Geant4 simulations are in good agreement with the available measurements for 6 Li fast neutron production, and suitable for neutron instrument background evaluation at spallation neutron sources.

Highlights

Related content- Ignition of Thermonuclear Fuels Utilising the Energy Liberated in 6LI(n,T)4He Reactions Kanapathipillai Murukesapilliai
The long (3ms) proton pulse of the European Spallation Source (ESS) [1] gives rise to unique background challenges for the instrument suite [2, 3, 4]. In such a long pulse spallation source, one of the main instrument performance limits is that defined by the instrument background, feeding into the Signal to Noise (S/N) ratio
Several different materials can be used in the beam line to shield or to attenuate the neutron background

Summary

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- Ignition of Thermonuclear Fuels Utilising the Energy Liberated in 6LI(n,T)4He Reactions Kanapathipillai Murukesapilliai. - An atomic beam of 6Li — 7Li for high resolution spectroscopy from matrix isolation sublimation A N Oliveira, R L Sacramento, B A Silva et al. - The array for EAS neutron component detection D Gromushkin, V Alekseenko, A Petrukhin et al. This content was downloaded from IP address 130.238.171.234 on 15/03/2018 at 13:03

Introduction

Primary Thermal neutron induced reactions

Conclusions