KX Rays from Fission Fragments Formed in Association with Long-Range Alpha-Particle Emission

The intensities of $K$ x rays emitted in coincidence with long-range $\alpha$ particles arising from the spontaneous fission of ${}_{}{}^{252}{}_{}{}^{}\mathrm{Cf}$ have been measured with a high-resolution lithium-drifted silicon spectrometer. A comparison of the observed x-ray intensity distribution with the x-ray intensity distribution resulting from binary fission shows that, aside from an increase in the x-ray intensitites for the lower atomic number members of the light and heavy fragment groups and a decrease in the x-ray intensities for the higher atomic number members in fission associated with long-range $\alpha$ emission, the general structural features are quite similar. Calculations based upon the two-step and one-step hypotheses of long-range $\alpha$-particle emission indicate a deviation from the "expected" intensity for xenon isotopes.