Properties of the multiplying medium

The purpose of hybrid reactors is to produce energy as well as a neutron excess which could be used for nuclear waste transmutation. As a con­sequence, it is important to evaluate to what extent the energy produced by fission in the multiplying medium exceeds the energy of the primary particle beam. As an example of expected values of k, we discuss the
experimental measurement of the energy produced in a subcritical system as was done in the FEAT experiment at CERN [122].