Implementation of Neutron Reflection with Nano-Dispersed Media in Geant4

A study has been carried out in order to see the feasibility of using nanodiamond particles as a reflector for cold and very cold neutrons in Geant4. Nanodiamond particles have a large scattering angle probability against very cold neutrons compared to the other materials due their high optical potential. This unique feature makes this powder a prominent candidate to be used as a reflector for very cold neutrons. Moreover, they can also be implemented for quasi-specular reflection of cold neutrons at small incidence angles due to multiple small-angle scattering of neutrons from nano-sized inhomogeneities in the scattering potential. A new process in Geant4 has been prepared in order to add cross sections of nanodiamond particles to the predefined processes. The geometry of previous experiments carried out in order to observe the reflection of nanodiamond particles has been developed in Geant4 in order to validate the implementation. The results show that there is a good agreement between the new method implemented in Geant4 and experimental data.