Abstract
The hyperfine structure of the ground state 4 f 7 6 s 2 8 S 7/2 of 151 Eu and 153 Eu has been measured by the method of magnetic resonance in an atomic beam. The sign of the hyperfine structure and the value of g J have also been measured. The results are: g J = 1·9935 ± 0·0003; A (151) = -20·0523 ± 0·0002 Mc/s, A (153) = -8·8532 ± 0·0002 Mc/s, B (151) = - 0·7012 ± 0·0035 Mc/s, B (153) = - 1·7852 ± 0·0035 Mc/s; A (151)/ A (153) = 2·26498 ± 0·00008, B (151)/ B (153) = 0·393 + 0·003. These results disagree with the values expected for the pure 8 S 7/2 state formed from a half-filled shell of f -electrons. Calculations on the basis of admixture of higher states of the configuration by spin-orbit coupling account for the discrepancy in g J but do not explain the values of the hyperfine structure constants A and B . Further theoretical work is in progress.
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Schedule a callMore From: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
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