On the Anomalies of E2 Conversion Coefficients in the Deformed-Nucleus Region

Abstract

Publisher Summary This chapter discusses the anomalies of E2 conversion coefficients in the deformed-nucleus region. E2 conversion coefficients for transitions between 2+ → 0+ states are known to be in good agreement with the theoretical calculations and are sometimes used as standards for determining conversion coefficients. In the deformed nucleus region 150 < A < 200, previous experiments systematically give higher values than the theoretical ones, suggesting that the deformation of the nucleus should affect the conversion coefficients. The experimental technique used in the measurements has been the scintillation spectroscopic method. The κ X-ray peak and the gamma-ray peak of interest have been measured in a scintillation spectrum, and a K-conversion coefficient has been deduced from the intensity ratio between the two lines. This method may introduce systematic errors because of the many corrections that have to be applied. Therefore, if single spectra are measured, the X-ray peaks may contain contributions resulting from the conversion of other gamma transitions. Then, very large values are obtained for the internal conversion coefficients (ICCs).