The Beta-Ray Spectra of Cu64
Positron and negatron spectra of Cu°^ have been investigated in the Columbia solenoid ß-raj spectrometer. By using thinner and more uniform sources and employing a more rigorous Coulomb correction factor, the deviations at the low energy region were greatly reduced as compared with previous work reported from other laboratories,, It seems probable that the remaining small observed deviation is instrumental and the Cu"^" spectra are actually of the allowed type.
In view of the large decrease in the deviation resulting from the use of thinner and more uniform sources and the use of a more rigorous Coulomb correction factor, it seems probable that the remaining small observed deviation is instrumental and the CuP^ spectra ; are actually of the allowed type.