Abstract
The closure of the 28 neutron core in the nuclei 54Fe and 56Fe is investigated. The energy spectra, spectroscopic amplitudes and electromagnetic transition rates for the γ-decay of the low lying states in these nuclei were determined from a shell model calculation using ( f 7 2 ) m( p 3 2 ) n ( p 1 2 ) q ; m ≧ 11 bases. Large neutron core breaking components in the wave functions of these low lying states result and these components contribute significantly both to the electromagnetic transition rates, and also in analyses of inelastic proton scattering from these nuclei. The inelastic scattering data were analyzed using an antisymmetrized distorted wave approximation that included core polarization corrections. The core polarization strengths required correlate to effective charges that are consistent with those required by the shell model calculations to match the experimental B(E L) values.
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