Low-Energy Conversion Electrons of ${\mathrm{Ag}}^{106}$ and ${\mathrm{Rh}}^{106}$; ${\mathrm{Pd}}^{106}$ Levels

The low-energy (less than 0.935 Mev) conversion electrons emitted in the decays of ${\mathrm{Ag}}^{106}$ and ${\mathrm{Rh}}^{106}$ have been observed in two permanent-magnet electron spectrographs. A total of 29 transitions were observed in the ${\mathrm{Ag}}^{106}$ decay; 2 transitions were observed in the ${\mathrm{Rh}}^{106}$ decay. These data and the gamma scintillation results of Robinson et al. on the same decays were used to postulate the following levels (in Mev) in ${\mathrm{Pd}}^{106}$: 0, (0+); 0.5116, (2+); 1.1272, (2+); 1.1331, (0+); 1.2287, (4+); 1.5568, (3, 4+); 1.7020, (2+); 1.9310, (3, 4+); 2.0825, (3+); 2.3040, (3, 4+); 2.3489, (3, 4+); 2.3636 or 1.9469, (3, 4, 5+); 2.7336, (5, 6+); 2.7540, (5+); and 2.9494, (5, 6+). The proposed level scheme indicates that ∼5%, ∼85%, and ∼10% of the electron capture of ${\mathrm{Ag}}^{106}$ proceeds to the 2.9494-, 2.7540-, and 2.7336-Mev levels, respectively.