Abstract: In this work 40 mass chain yields (A= 83-161 ) are obtained. An integration of the mass yield curve gives a value of 197.2% which is in agreement with expected value of 200% in fission. The mean masses of the light and heavy groups are 52.65% and 72.24% respectively .They are located at 97.5 and 139.0. The average neutron number per fission (v) is 2.5. The v value obtained is compared with that in literature.