K X 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 α particles arising from the spontaneous fission of Cf252 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 α emission, the general structural features are quite similar. Calculations based upon the two-step and one-step hypotheses of long-range α-particle emission indicate a deviation from the expected" intensity for xenon isotopes. © 1969 The American Physical Society."