Charge distribution of light mass fission products in the thermal neutron induced fission of 233U, 235U and 239Pu

Fractional cumulative yields (FCY) of various light mass fission products in the( 233)U(n(th), f),U- 235(n(th), f) , Pu-239 (n(th), f) reactions were measured by using an off-line ?-ray spectrometric technique. The values of most probable charge (Z(P)) were obtained by using the width of isobaric charge distribution (s(Z)) of nearby fissioning systems with proper apportion. From the Z(P) values, the experimental charge polarization (??(EXPT)) as a function of fragment mass were also deduced. The ??(EXPT) values for the light mass chains from the present work and for the heavy mass chains from earlier work show an oscillating nature in the interval of five mass units due to even-odd staggering. A local effect around the shell region and a systematic decreasing trend with the approach of symmetric split was also observed. The ??(MPE) values based on minimum potential energy surface were theoretically calculated, which shows no oscillation but only a systematic decreasing trend with the approach of symmetric split due to the assumption of liquid drop behaviour of the fissioning nucleus.