Experimentalgfactors andB(E2)values of21+,41+,22+, and31−states inZn64andZn68compared to shell model predictions

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Abstract

The g factors of the short-lived ${2}_{1}^{+},{4}_{1}^{+}$, and ${3}_{1}^{\ensuremath{-}}$ states in $^{64}\mathrm{Zn}$ and the ${2}_{1}^{+},{4}_{1}^{+},{2}_{2}^{+}$, and ${3}_{1}^{\ensuremath{-}}$ states in $^{68}\mathrm{Zn}$ have been measured using the combined technique of projectile Coulomb excitation in inverse kinematics and transient magnetic fields. In addition, $B(E2)$'s have been deduced from remeasured lifetimes of several excited states employing the Doppler-shift-attenuation method. Whereas the present data for the ${2}_{1}^{+}$ states agree very well with our previous results, the g factors of the other states have been determined for the first time. All experimental data were compared with results from large-scale shell model calculations based on proton and neutron configurations in the $\mathrm{fp}$ and $\mathrm{fpg}$ model spaces with $^{40}\mathrm{Ca}$ and $^{56}\mathrm{Ni}$ as inert cores, respectively.

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