Abstract
The results of a numerical simulation of a superthermal source of ultracold neutrons on superfluid helium near a subcritical core of an electronuclear system are examined. It is shown that for a limited core power and using cold filters to produce the spectrum of neutrons entering the cryostat zone with liquid helium, the heat release in helium with adequate volume can be limited to a reasonable value 1 W. Various versions of the MCNP code are used. The heat release from γ rays and neutrons with different energies is estimated for two positions of the cryostat relative to the vertical center of the plane of the core. It is shown that a spatial ultracold-neutron density exceeding 103 cm–3 can be obtained with additional conversion of cold neutrons on a solid-deuterium layer surrounding the helium vessel.
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Vasil'ev, V.V., Lopatkin, A.V., Muratov, V.G. et al. Superfluid Helium in a Subcritical Core. Atomic Energy 92, 185–196 (2002). https://doi.org/10.1023/A:1016029010799
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DOI: https://doi.org/10.1023/A:1016029010799