title: Large enhancement of radiative strength for soft transitions in the quasicontinuum.
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.
authors.affiliation: Frank Laboratory of Neutron Physics, Joint Institute of Nuclear Research, 141980 Dubna, Moscow region, Russia. voinov@ohiou.edu
authors.forename: A
authors.initials: A
authors.lastname: Voinov
authors.forename: E
authors.initials: E
authors.lastname: Algin
authors.forename: U
authors.initials: U
authors.lastname: Agvaanluvsan
authors.forename: T
authors.initials: T
authors.lastname: Belgya
authors.forename: R
authors.initials: R
authors.lastname: Chankova
authors.forename: M
authors.initials: M
authors.lastname: Guttormsen
authors.forename: G E
authors.initials: GE
authors.lastname: Mitchell
authors.forename: J
authors.initials: J
authors.lastname: Rekstad
authors.forename: A
authors.initials: A
authors.lastname: Schiller
authors.forename: S
authors.initials: S
authors.lastname: Siem