Examination of the low-energy enhancement of the gamma-ray strength function of Fe-56
- M.D. Jones
- A.O. Macchiavelli
- M. Wiedeking
- L.A. Bernstein
- H.L. Crawford
- C.M. Campbell
- R.M. Clark
- M. Cromaz
- P. Fallon
- I.Y. Lee
- M. Salathe
- A. Wiens
- A.D. Ayangeakaa
- D.L. Bleuel
- S. Bottoni
- M.P. Carpenter
- H.M. Davids
- J. Elson
- A. Gö
- M. Guttormsen
- R.V.F. Janssens
- J.E. Kinnison
- L. Kirsch
- A.C. Larsen
- T. Lauritsen
- W. Reviol
- D.G. Sarantites
- S. Siem
- A.V. Voinov
- S. Zhu
DOIAbstract
A model-independent technique was used to determine the \uce\ub3-ray strength function (\uce\ub3SF) of Fe56 down to \uce\ub3-ray energies less than 1 MeV for the first time with GRETINA using the (p,p\ue2\u80\ub2) reaction at 16 MeV. No difference was observed in the energy dependence of the \uce\ub3SF built on 2+ and 4+ final states, supporting the Brink hypothesis. In addition, angular distribution and polarization measurements were performed. The angular distributions are consistent with dipole radiation. The polarization results show a small bias towards magnetic character in the region of the enhancement
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