The shape of the beta-spectrum of the direct 1.17 Mev, 8 percent abundant transition between the gm ground state of Cs 137 and the dzn ground level of Ba 137 has been studied in detail in a magnetic spectrometer. The shape of the spectrum can be adequately described by a twice-forbidden factor, Cw, resulting from the tensor form of interaction. Neither the axial vector form nor the combination S-A-P are capable of accounting for the data.
The radioactive decay of 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.
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