The Second-Forbidden Beta Spectra ofCo60andSc46

Abstract

A hitherto unreported high-energy beta-ray component has been found in the decay of ${\mathrm{Co}}^{60}$. Its abundance and end point are (0.15±0.01) percent and 1.48±0.02 Mev, respectively. The abundance and end point of the ${\mathrm{Sc}}^{46}$ high-energy component are (0.096±0.01) percent and 1.25±0.02 Mev, respectively. Both the ${\mathrm{Co}}^{60}$ and ${\mathrm{Sc}}^{46}$ spectra can be fitted with the $C_{2T}$ correction factor corresponding to $\Delta J=2\mathrm{}$ and no parity change. The $log\mathrm{ft}$ values, uncorrected for the forbidden shape, are: ${\mathrm{Co}}^{60}$=12.6, and ${\mathrm{Sc}}^{46}$=11.3. The decay schemes are discussed.