Total kinetic energy release in the fast neutron-induced fission of $^{235}$U

Abstract The total kinetic energy (TKE) release in the fast neutron induced fission of 235 U was measured for neutron energies E n = 2 – 100 MeV . The TKE distributions are Gaussian in shape. The mean post neutron emission TKE release decreases non-linearly with increasing neutron energy and can be represented as TKE(MeV) = 170.92 − 3.73774 log 10 ⁡ E n − 0.65028 ( log 10 ⁡ E n ) 2 . Abrupt changes in the variances of the TKE distributions are observed at the onset of 2nd, 3rd, etc. chance fission. For E n = 20 – 100 MeV , the variances are approximately constant. These observations are compared to the predictions of the GEF model for neutron-induced fission. This model describes many of the features of the TKE release adequately.