K-Auger Electrons, Positrons, and Conversion Electrons ofZn65Above 5 kev

The momentum distributions of $K$-Auger electrons, positrons, and conversion electrons of ${\mathrm{Zn}}^{65}$ have been measured in a magnetic lens spectrometer, with very thin sources and counter windows. The positron Fermi plot was found to be linear from the end point of 325±3 kev to about 50 kev. The positron decay is simple, contrary to same previously published results. From the observed intensities of $K$-Auger electrons, positrons, and conversion electrons, and values of capture branching ratio, fluorescence yield, and $L$ to $K$ capture ratios taken from the literature, the intensity ratios of the various spectral components have been obtained. The resulting conversion coefficient, $\alpha =(2.56\mathrm{}\pm 0.29)\times {10}^{-4\mathrm{}}$, agrees with experimental determinations and strongly suggests an $E2\mathrm{}$ transition. The observed ratio of $K$ capture to the ground state to positrons, 28.0±3.2, is in satisfactory agreement with the recently calculated theoretical value of 29.0 for an allowed transition. This agreement, in view of the high $\mathrm{ft}$ value, establishes the $l$-forbidden character of the transition.