Disintegration ofSb124

Abstract

The radioactive decay of ${\mathrm{Sb}}^{124}$ has been reinvestigated in the large magnetic spectrometer and with scintillation techniques. $K$ and $L$ photoelectron lines are observed for gamma-rays of energy 0.603, 0.641, 0.716, 1.68, and 2.09 Mev. The curved Fermi plot of the highest energy beta-ray group is straightened by a once forbidden correction factor consistent with a general STP beta-interaction for spin change unity. Analysis in this manner gives beta-ray energies and intensities of 2.317 Mev, 21 percent; 1.602, 7 percent; 0.966, 9 percent; 0.61, 49 percent and 0.24, 14 percent. The 0.603-Mev gamma-ray is identified as electric quadrupole. A consistent decay scheme, substantiated by gamma-gamma and beta-gamma coincidences is proposed.