Measurements of some gamma-ray relative intensities and internal conversion coefficients using a bent-crystal monochromator

Abstract

The X-ray and gamma-ray relative intensities were measured, from the decay of and Sm^^^ with a bent-crystal monochromator and a linear least-squares computer program. The K-shell internal conversion coefficients were determined for the E2 transitions in and Er . The K-shell conversion coefficient, for the 84.3-keV transition in Yb^^^ was determined to be 1.43±0.04 while the K-shell internal conver­ sion coefficient for the 80.6-keV transition in Er was determined to be 4* + 1.72±0.06. The results for these 2 -K) transitions are five percent higher than the theoretical values for these transitions. From the relative inten180 sities of the transitions in Hf it was possible to deduce a value for the 93 total internal conversion coefficient for the 93.3-keV transition of cy = 4.91±0.23. Using the previous measurements of conversion electron intensi­ ties of Edwards and Boehm and the present measured gamma-ray relative inten­ sities, internal conversion coefficients for all the other transitions were obtained. The present measurements of for the 215.3-, 332.5and 443.8keV E2 transitions are 11 percent lower than the theoretical values, while for the 93.3-keV E2 transition agrees closely with the theoretical value. These results are in close agreement with the previous measurements of Edwards and Boehm. The present valjie_for_a|^ for the 501-keV transition agrees closely with the theoretical for an E3 multipolarity. From the 1 CC X-ray and gamma-ray relative intensities of the transitions in Gd and the previous measurement of the ratio of K conversion electrons for the 86and 105-keV transitions of Subba Rao, it was possible to determine the K