Large enhancement of radiative strength for soft transitions in the quasicontinuum |
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| Authors: | Voinov A Algin E Agvaanluvsan U Belgya T Chankova R Guttormsen M Mitchell G E Rekstad J Schiller A Siem S |
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| Institution: | Frank Laboratory of Neutron Physics, Joint Institute of Nuclear Research, 141980 Dubna, Moscow region, Russia. voinov@ohiou.edu |
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| Abstract: | Radiative strength functions (RSFs) for the (56,57)Fe nuclei below the separation energy are obtained from the 57Fe(3He,alphagamma)56Fe and 57Fe(3He,3He'gamma)57Fe reactions, respectively. An enhancement of more than a factor of 10 over common theoretical models of the soft (E(gamma) less than or approximately equal 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 56Fe(n,2gamma)57Fe reaction confirm the enhancement. |
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