epithermal neutron

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ep·i·ther·mal neu·tron

a neutron having an energy in the range immediately above the thermal range, that is, having an energy between a few hundredths and approximately 100 ev.
References in periodicals archive ?
p] for epithermal neutron capture in medium-to-heavy nuclei.
The thermal neutron background component from the thermal and epithermal neutrons multiply scattered on collimators will depend on the collimation system.