The total delayed neutron yield from **2**3**5U was calculated as a function of the energy of the neutron inducing fission. The calculations (based on fission data and fission systematics) extend from thermal to 15-MeV neutron energies. The energy-dependent delayed neutron calculations are generally consistent with experimental results from thermal to 14-MeV neutron energies. Delayed neutron yields per 10**4 fissions of 168. 7 plus or minus 16. 7, 178. 2 plus or minus 17. 2, and 88. 9 plus or minus 10. 0 were obtained at thermal, fission-spectrum, and 15-MeV neutron energies, respectively. The energy dependence of the odd-even effect in the fission charge distribution is found to partially account for the near constant yield observed below 5-MeV neutron energy, as well as the rapid decrease in yield observed at the second-change fission threshold.
ASJC Scopus subject areas
- Nuclear Energy and Engineering