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Phys. Rev. Lett. 93, 142504 (2004) [4 pages]

Large Enhancement of Radiative Strength for Soft Transitions in the Quasicontinuum

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A. Voinov1,2 *, E. Algin3,4,5,6, U. Agvaanluvsan3,4, T. Belgya7, R. Chankova8, M. Guttormsen8, G. E. Mitchell4,5, J. Rekstad8, A. Schiller3 †, and S. Siem8
1Frank Laboratory of Neutron Physics, Joint Institute of Nuclear Research, 141980 Dubna, Moscow region, Russia
2Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
3Lawrence Livermore National Laboratory, L-414, 7000 East Avenue, Livermore, California 94551, USA
4North Carolina State University, Raleigh, North Carolina 27695, USA
5Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
6Department of Physics, Osmangazi University, Meselik, Eskisehir, 26480 Turkey
7Institute of Isotope and Surface Chemistry, Chemical Research Centre HAS, P.O. Box 77, H-1525 Budapest, Hungary
8Department of Physics, University of Oslo, N-0316 Oslo, Norway

Featured in Physics News Update Received 26 April 2004; published 29 September 2004

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 (Eγ≲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,2γ)57Fe reaction confirm the enhancement.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.93.142504
DOI: 10.1103/PhysRevLett.93.142504
PACS: 25.40.Lw, 25.20.Lj, 25.55.Hp, 27.40.+z

* Electronic address: voinov@ohiou.edu
† Electronic address: schiller@nscl.msu.edu

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