Post-Neutron Mass Yield Distribution in the Epi-Cadmium Neutron-Induced Fission of ²³⁹Pu

In the epi-cadmium neutron-induced fission of ²³⁹Pu, cumulative and independent yields of various fission products within the mass ranges of 83 to 117 and 123 to 156 have been measured by using an off-line gamma-ray spectrometric technique. The spectrum average neutron energy is 1.9 MeV. Charge distribution correction on the cumulative yields was applied to obtain their post-neutron mass yields. Mass yield distribution parameters such as the peak-to-valley (P/V) ratio, the full-width at tenth-maximum of light and heavy mass wings, the average light mass <A_L> and heavy mass <A_H>, and the average neutron number <ν> were obtained. The mass yields in the epi-cadmium and thermal neutron–induced fission of ²³⁹Pu were compared to examine the role of excitation energy on the P/V ratio and the nuclear structure effect.