Calorimetric Determination of the Average Total Kinetic Energy of Fragments from Fission ofU235andU238by 14-Mev Neutrons

The fission yields of ${\mathrm{Mo}}^{99}$ from 14-Mev neutron bombardments of ${\mathrm{U}}^{235}$ and ${\mathrm{U}}^{238}$ were found to be (5.01±0.15)% and (5.86±0.16)%, respectively. The average total fragment kinetic energies released in fission of ${\mathrm{U}}^{235}$ and ${\mathrm{U}}^{238}$ were found to be 174±4 and 175±2 Mev. respectively.