The hyperfine structure of209Bi

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Abstract
The hyperfine structure (H.F.S.) of the J = 3/2 ground state of 209Bi has been found by the atomic beam magnetic resonance method. Two of the three H.F.S. intervals were measured directly, giving (W 50-W 60)/h=2884·7±0.2 Mc/s and (W 40-W 60)/h = 2171·5 ± 0·1 Mc/s. Those results are consistent with a magnetic dipole interaction constant A of -446·97 ± 0·04 Mc/s and an electric quadruple interaction constant B of -303·3±0·3 Mc/s. The latter yields an uncorrected nuclear electric quadrupole moment of -0·34 barns, and the field dependence of δF=0 transitions gives -1·6433 ± 0·0002 for the ground state gj value. The results are discussed in terms of the intermediate coupling theory of Breit and Wills (1933).