PRODUCTS FROM THERMAL--NEUTRON INDUCED FISSION OF $sup 235$U: A CORRELATION OF RADIOCHEMICAL CHARGE AND MASS DISTRIBUTION DATA.

Mass and charge distribution data for fission products after prompt neutron emission have been compiled and used to determine v^, the average number of prompt neutrons emitted in forming products with complementary mass numbers (Ai + A^ = 236 -vt), and also Zp and a, parameters in a new chargedistribution formulation.The compilation includes both new data and older data, some of it re-evaluated using current values for fission-product half-lives and delayed-neutron yields.The values of vt determined using Terrell's method with normalized chain yields are generally consistent with results derived from direct physical measurements.The Zp values, the most probable (or average) charge for isobars, derived from radiochemical data are also consistent with those determined by physical methods involving measurement of x-rays or beta-decay chain lengths.The new Gaussian width parameter a has a value of 0.56*0.06,which corresponds to a full-width at half-maximum of 1.50±0.12charge units.