Radiative strength functions (RSFs) for the 56,57Fe nuclei below the separation energy are obtained from the ⁵⁷Fe(³He,αγ)⁵⁶Fe and ⁵⁷Fe(³He,³He^'γ)⁵⁷Fe reactions, respectively. An enhancement of more than a factor of 10 over common theoretical models of the soft (E_γ2 MeV) RSF for transitions in the quasicontinuum (several MeV above the yrast line) is observed. Two-step cascade intensities with soft primary transitions from the ⁵⁶Fe(n,2γ)⁵⁷Fe reaction confirm the enhancement.
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Voinov et al. (2004) studied this question.
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