EPJ Web Conf.
Volume 231, 20208th International Meeting of Union for Compact Accelerator-Driven Neutron Sources (UCANS-8)
|Number of page(s)||6|
|Published online||11 March 2020|
Directional reflection of cold neutrons using nanodiamond particles for compact neutron sources
1 Dep. of Physics, University of Milano-Bicocca, Milano, 20126, Italy
2 European Spallation Source ESS ERIC, P.O Box 176, SE-221 00 Lund, Sweden
* Corresponding author: M.email@example.com
Published online: 11 March 2020
Nanodiamond Particles (NDP) are new candidates for neutron reflection. They have a large scattering and low absorption cross-sections for low-energy neutrons. Very Cold Neutrons (VCN) are reflected from NDP with large scattering angles while Cold Neutrons (CN) have a quasi-specular reflection at small incident angles. A new scattering process has been added in Geant4 in order to examine the directional reflection of CN in an extraction beam made of NDP layer. Impurities in NDP are responsible for the up-scattered neutrons, especially hydrogen which has a large cross-section. Other impurities are also considered in Geant4 in order to produce a more accurate model for NDP scattering. The new scattering process is used to model a possible configuration of target-moderator-reflector in Compact Neutron Sources (CNS). A 13 MeV proton beam striking a beryllium target is chosen. Parahydrogen is placed as a cold moderator in order to produce CN. NDP are placed around the extraction beam for scattering the CN toward the exit of the beam. The results show that CN exiting the extraction beam can be increased thanks to the implemented NDP layer.
© The Authors, published by EDP Sciences, 2020
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