The gamma-ray strength function of Fe-56 has been measured from proton-gamma coincidences for excitation energies up to approximate to 11 MeV. The low-energy enhancement in the gamma-ray strength function, which was first discovered in the (He-3, alpha gamma)Fe-56 reaction, is confirmed with the (p, p'gamma)Fe-56 experiment reported here. Angular distributions of the gamma rays give for the first time evidence that the enhancement is dominated by dipole transitions.
Evidence for the dipole nature of the low-energy gamma enhancement in Fe-56 / A. C. Larsen, N. Blasi, A. Bracco, F. Camera, T. K. Eriksen, A. Goergen, M. Guttormsen, T. W. Hagen, S. Leoni, B. Million, H. T. Nyhus, T. Renstrom, S. J. Rose, I. E. Ruud, S. Siem, T. Tornyi, G. M. Tveten, A. V. Voinov, M. Wiedeking. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 111:24(2013), pp. 242504.1-242504.5.
Evidence for the dipole nature of the low-energy gamma enhancement in Fe-56
A. Bracco;F. Camera;S. Leoni;
2013
Abstract
The gamma-ray strength function of Fe-56 has been measured from proton-gamma coincidences for excitation energies up to approximate to 11 MeV. The low-energy enhancement in the gamma-ray strength function, which was first discovered in the (He-3, alpha gamma)Fe-56 reaction, is confirmed with the (p, p'gamma)Fe-56 experiment reported here. Angular distributions of the gamma rays give for the first time evidence that the enhancement is dominated by dipole transitions.
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