Range Measurements of Fission Products. II. Kinetic Energy Deficit and Width of the Energy Distributions

Range measurements of fission products (${\mathrm{Zr}}^{97}$, ${\mathrm{Mo}}^{99}$, ${\mathrm{Rh}}^{105}$, ${\mathrm{Pd}}^{112}$, ${\mathrm{In}}^{115}$, ${\mathrm{Te}}^{132}$, ${\mathrm{Ce}}^{143}$) in gases have been compared with the range-energy tables of Northcliffe and Schilling. A reevaluation of the kinetic energy deficit for symmetric fission has been made, using a modification of these range-energy relationships. Experimental measurements of range distributions of fission fragments stopped in gases have been used to determine the width of the kinetic energy distributions as a function of product mass. The values obtained are compared with those from other workers.