Abstract
Abstract The g -factors of the first-excited J π = 2 + states of 24 Mg and 26 Mg have been measured with the ion-implantation perturbed angular correlation technique (IMPAC). The precession of the spins of nuclei recoiling into a magnetized iron backing is predominantly caused by the transient magnetic field for these very light and short-lived ( τ m ≈ 1 ps) nuclei. The transient field, which attains a value of 200 T for the Mg isotopes, is present only during the slowing-down of the recoiling nucleus and results in average precession angles of about 1.5 mrad. The experimental results are treated in the framework of the transient field theory of Lindhard and Winther. This yields g -factors of g = +0.42 b ± 0.09 and g = +1.3 ± 0.3 for 24 Mg and 26 Mg, respectively. The results are compared with theoretical predictions and for 24 Mg also with a recent time-differential deorientation experiment.
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