Thus, a neutron flux comprising many epithermal neutrons can be obtained.

The invention concerns a moderator material used for moderation of high-velocity neutrons, in particular of fission neutrons, to epithermal neutrons.

This heavy water can quickly moderate neutrons and thus increase the number of epithermal neutrons without any increase in the thickness.

The thickness of the aluminum fluoride layer (3) is set so as to increase the number of epithermal neutrons.

The specially shielded near-epithermal is also independently useful as a monitor of the output of high energy neutron sources.

Also, the detector array may include both epithermal and thermal neutron detectors to afford an epithermal/thermal comparison measurement.

The inelastic gamma-ray signal may be substantially free of epithermal and thermal neutron capture background.

In a case where the number of epithermal neutrons is increased by the aluminum fluoride layer (3) alone, the aluminum fluoride layer (3) must have too large a thickness.

The MSRE was an engine of test of 7,4 MWth, intended to simulate the neutronics (in epithermal neutrons) of the core breeder to intrinsically sure thorium.

The MSRE was a 7.4 MWth test reactor simulating the neutronic "kernel" of an inherently safe epithermal thorium breeder reactor.

The MSRE was an engine of test of 7,4 MWth, intended to simulate the neutronics (in epithermal neutrons) of the core breeder to intrinsically sure thorium.

The MSRE was an engine of test of 7,4 MWth, intended to simulate the neutronics (in epithermal neutrons) of the core breeder to intrinsically sure thorium.

The MSRE was a 7.4 MWth test reactor simulating the neutronic "kernel" of an inherently safe epithermal thorium breeder reactor.