Search for neutrons with energy more than 40 MeV in fission

Neutrons of anomalously high energies have been looked for in the beam of the IBR-30 pulsed reactor by the time-of-flight method by means of a scintillation anticoincidence detector with a low threshold for cosmic rays. Observation of such neutrons would be an indication that superdense nuclei with increased binding energy are being formed in the reactor core in fission of the nuclei of the fuel. It was established that the neutron yield in the approximate energy range 40--200 MeV does not exceed about 2x10/sup -8/ per fission.