Distribution ofKX Rays as a Function of Mass and Atomic Number in the Spontaneous Fission ofCf252

Measurements of the intensities of $K$ x rays in coincidence with fission were carried out in an experiment in which the energies of complementary fission fragment pairs and $K$ x rays were recorded event by event, using a multiparameter analyzer. Subsequent analysis of the data resulted in the determination of the x-ray intensities associated with intervals of fragment mass for each contributing element. Most probable charge and mass values for the emission of $K$ x rays were determined, and it was found that these most probable masses could be used to adequately define the $Z_p$ curve - without appreciable biasing due to details of nuclear structure. An examination of the effect of total kinetic energy on the x-ray distribution revealed a distinct enhancement of even-$Z$ $K$ x-ray contributions to the yields as the total kinetic energy increases. Apparent shifts in the values of most probable masses for the emission of $K$ x rays were also observed as a function of total kinetic energy.