Mean Lifetime and Magnetic Moment of the 2.95-MeV (6+) State ofFe54

Abstract

The mean lifetime and $g$ factor of the 2.95-MeV $6^{+}$ state of ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ were measured to be $\tau =1.76\mathrm{}\pm 0.03$ nsec and $\mathrm{}\left|g\right|=1.37\mathrm{}\pm 0.03$, respectively. These results are in agreement with the shell-model assignment ${\left({f_{\frac{7}{2}}}^{-2\mathrm{}}\right)}_{\pi }$ plus a small amount of configuration mixing which accounts for the quenching of the magnetic moment from the Schmidt limit and the enhanced $E2\mathrm{}$ rate $B(E2;6^{+}\to 4^{+})=3.2\mathrm{}$ Weisskopf units.