Magnetic moments of the2+first excited states of even iron isotopes

The large magnetic fields that act on fast-moving ions traversing thin magnetized Fe foils were utilized to remeasure the magnetic moments of the first excited $2^{+}$ states of ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ and ${}_{}{}^{58}{}_{}{}^{}\mathrm{Fe}$. The technique reported here does not require an accurate knowledge of the nuclear lifetime and does not depend on the static magnetic field of Fe in Fe. Assuming $g({}_{}{}^{56}{}_{}{}^{}\mathrm{Fe},2^{+})=0.61\mathrm{}\pm 0.08$, we obtain $g=1.68\mathrm{}\pm 0.38$ and $g=0.46\mathrm{}\pm 0.10$ for the first $2^{+}$ states of ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ and ${}_{}{}^{58}{}_{}{}^{}\mathrm{Fe}$, respectively. The present results agree well with previous measurements and support the existing models for the structure of these states.