Large enhancement of radiative strength for soft transisitons in the   quasicontinuum
  Radiative strength functions (RSFs) for the 56,57-Fe nuclei below the separation energy are obtained from the 57-Fe(3-He,alpha gamma)56-Fe and 57-Fe(3-He,3-He' gamma)57-Fe reactions, respectively. An enhancement of more than a factor of ten over common theoretical models of the soft (E_gamma ~< 2 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 56-Fe(n,2gamma)57-Fe reaction confirm the enhancement. 
A. Voinov, E. Algin, U. Agvaanluvsan, T. Belgya, R. Chankova, M.   Guttormsen, G. E. Mitchell, J. Rekstad, A. Schiller, S. Siem