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 inten-180 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-, 332.5-and 443.8-keV 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 V conversion coefficients for the 86-and 105-keV transitions of «j, = 0.43 ±0.06 and = 0.23±0.03. These results are in agreement with the theo retical values for pure El transitions. The relative intensities of the 246-, 142-and 104-keV gamma rays following the decay of 22 minute were determined with improved precision in order that they might be used to determine accurately the conversion coefficients for these transitions.

Silicon detector studies of nuclear internal conversion in Sm155 and Nd151

“…Hatch (18,19) employed a bent-crystal spectrometer to measure K x-ray to gamma-ray ratios in the decays of Tm^^^, Ho^^^ and Eu^^^. Boneau and Hatch (20) used a normal Nal(Tl) scintilla tion crystal in a coincidence arrangement to measure for a transition in Er^^^ by this method.…”