Abstract

$^{9}\mathrm{Be}$-induced inelastic scattering of $^{62,64,66}\mathrm{Fe}$ and $^{60,62,64}\mathrm{Cr}$ was performed at intermediate beam energies. Excited states in $^{64}\mathrm{Cr}$ were measured for the first time. Energies and population patterns of excited states in these neutron-rich Fe and Cr nuclei are compared and interpreted in the framework of large-scale shell-model calculations in different model spaces. Evidence for increased collectivity and for distinct structural changes between the neighboring Fe and Cr isotopic chains near $N=40$ is presented.

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