Geant4 simulation of the moderating neutrons spectrum

TL;DR

This paper presents a Geant4 Monte Carlo method for predicting steady-state and non-equilibrium neutron spectra in arbitrary media, addressing the complexity of analytical calculations.

Contribution

It introduces a novel Geant4-based simulation approach for neutron spectrum prediction in complex geometries and compositions.

Findings

Successful simulation of steady-state neutron spectra

Snapshots of neutron spectrum evolution over time

Applicable to media with arbitrary composition and geometry

Abstract

In this paper we deal with the problem of predicting a steady-state neutron spectrum in media of arbitrary composition and geometry. The analytical calculations of such spectrum are often too complex, if at all possible. We describe a method of Geant4-based Monte Carlo calculation of the steady-state neutron spectrum in a medium containing a fixed neutron source. In addition to the steady-state spectrum, we obtain the snapshots of the neutron spectrum evolution in time, which may be thought of as the non-equilibrium neutron spectra, and their form is of considerable interest for further studies.