The M/I and I /E. orbital-electron-capture ratios in the decay of~5 Fe have been determined by introducing the radioactive compound ferrocene-~5Fe into a multiwire, wall-less anticoincidence proportional counter as part of the counting gas mixture. The results are P~/Pl =0.157+ 0.003 and PL /Pz =0.117+0.001 at Z =26. These values are compared with various theoretical predictions and, together with previous experimental results on M/L capture ratios at low Z, they demonstrate that of all the combinations of theoretical approaches, the Watson-Freeman wave functions with the exchange corrections of Vatai are the only ones which give good agreement with experiment at low Z. All other theoretical combinations lie considerably higher than experiment in the region below Z =36.
The decay of the isotope Ba 133 , produced by pile neutron irradiation of Ba 132 , has been studied with a magnetic lens and scintillation spectrometers. Gamma rays of 0.079, 0.302, and 0.355 Mev have been measured, with relative intensities 1.00:0.71:2.1 and J£-conversion coefficients of 1.3±0.5, O.llrLO.07, and 0.07±0.05, respectively. Conversion electrons from weak transitions of energies 0.158 and 0.276 Mev have been observed and assigned to Ba 133 . Gamma-gamma coincidences have been measured and a decay scheme is proposed. The K/L capture ratio for Ba 133 is shown to be greater than 1.5.
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