Energy of the Delayed Neutrons from the Fission of U235

The energy distribution of neutrons from the short-lived neutron emitters produced in the thermal fission of ${\mathrm{U}}^{235}$ has been determined with a cloud chamber. A continuous energy distribution was obtained with a maximum number of neutrons at the lowest energies and a few neutrons with energies of at least 2.4 Mev. A linear plot of ${(\mathrm{number}\mathrm{of}\mathrm{neutrons})}^{\frac{1}{5}}$ versus the neutron energy is obtained indicating an extrapolated neutron energy of 3.5 Mev.