Hfs Anomaly ofSb121andSb123Determined by the Electron Nuclear Double Resonance Technique

Abstract

The ratios of the hyperfine interaction constants "$a$" and the nuclear $g$ factors of the stable isotopes of antimony have been measured. From these measurements the hyperfine structure anomaly, defined as $\Delta =\left(\frac{a_{121}}{a_{123}}\right)\left(\frac{g_{123}}{g_{121}}\right)-1\mathrm{}$, was found to be (-0.352±0.005)%. $\Delta$ has its origin in the difference in the spatial distribution of the nuclear magnetic dipole for the two isotopes, which is related to the structure of the two nuclei. The experimental result is compared with theoretical values of $\Delta$ based on a variety of nuclear models.