The nuclear magnetic dipole moments of the stable isotopes of europium and the hyperfine structure anomaly

The nuclear magnetic dipole moment of 151Eu and the ratio of the moments of 151Eu and 153Eu have been measured by the new method of resonance in three loops in a short atomic beam. The results are: μ(151Eu) = 3·419 ± 0·004 n.m.; μ(151Eu) / μ(153Eu)= 2·2686 ± 0·0015. The result, taken together with the ratio of the hyperfine structures of europium, gives a hyperfine structure anomaly of (1·0 + 0·23)%. A theoretical value of the anomaly is estimated.