The hyperfine structure of121Sb and123Sb

Abstract

The hyperfine structure of the J=3/2 ground state of ¹²¹Sb and ¹²³Sb has been studied by the atomic beam magnetic resonance method, and the results are consistent with the following values for the interaction constants: g_J =-l·9705±0·0002, A ₁₂₁=-(299·034 ± 0·004) Mc/s, A ₁₂₃=-(162·451 ± 0·003) Mc/s, B ₁₂₁=-(3·68±0·02) Mc/s, and B ₁₂₃=-(4·67 ± 0·03) Mc/s. To the accuracy of the measurements there was no evidence for an octupole interaction. From the B values one obtains Q ₁₂₁=-(0·20 ± 0·03) x 10⁻²⁴ cm² and Q ₁₂₃=-(0·20 ± 0·04) x 10⁻²⁴ cm², and comparison of A ₁₂₁/A ₁₂₃ with the ratio of g ₁₂₁/g ₁₂₃ already published gives -0·318±0·003% for the hyperfine structure anomaly. Intermediate coupling theory accounts satisfactorily for g_J , but an admixture of excited s states is necessary to explain the observed magnetic interaction and anomaly.