Concerning internal conversion coefficients in Hf180

Abstract

The gamma-ray relative intensities from transitions in Hf180 following the 5.5 hour Hf180m decay have been measured using a bent-crystal gamma-ray diffraction monochromator and a least-squares fitting technique. From these measurements it was possible to deduce a value for the internal conversion coefficient for the 93.3-keV transition of α T 93 =4.91±0.23. From previous measurements of conversion electron intensities byEdwards andBoehm and our gamma-ray relative intensities, internal conversion coefficients for all transitions except the 57.5-keV transition were obtained. These coefficients agree well with the previous determinations byEdwards andBoehm, however, our measurements have improved precision, particularly in the case of 501.3-keV transition. The present measurements of α K for the 215.3-, 332.5-and 443.8-keVE2 transitions are 11% lower than theoretical values while αK for 93.3 keV E2 transition agrees closely with the theoretical value. These results are in close agreement with the previous measurements ofEdwards andBoehm. The present experimental αK for the 501-keV transition agrees closely with the theoretical αK for an E3 multipolarity.