Charge Distribution in the Spontaneous Fission of 252Cf: Determination of Fractional Cumulative Yields of 138Xe and 139Cs

The fractional cumulative yields (FCY) of , 3 , X e and 1 3 Cs in the spontaneous fission of , 5 , C f have been determined. The values of fractional cumulative yields are 0.85 ± 0.03 and 0.977 ± 0.006 for , 3 , X e and , 3 9 Cs respectively. An analysis of these values along with other relevant data in literature shows the similarity between the systematics of charge distribution in the spontaneous fission of 1 * Cf and that of thermal neutron induced fission o f 5 3 s U.