Evidence for dipole nature of the low-energy γ enhancement in 56Fe

Larsen, A. C. and Blasi, N. and Bracco, A. and Camera, F. and Eriksen, T. K. and Görgen, A. and Guttormsen, M. and Hagen, T. W. and Leoni, S. and Million, B. and Nyhus, H. T. and Renstrøm, T. and Rose, S. J. and Ruud, I. E. and Siem, S. and Tornyi, Tamás Gábor and Tveten, G. M. and Voinov, A. V. and Wiedeking, M. (2013) Evidence for dipole nature of the low-energy γ enhancement in 56Fe. PHYSICAL REVIEW LETTERS, 111 (24). ISSN 0031-9007

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Abstract

The γ-ray strength function of 56Fe has been measured from proton-γ coincidences for excitation energies up to ≈ 11 MeV. The low-energy enhancement in the γ-ray strength function, which was first discovered in the ( 3He,αγ) 56Fe reaction, is confirmed with the (p, p 0 γ) 56Fe experiment reported here. Angular distributions of the γ rays give for the first time evidence that the enhancement is dominated by dipole transitions.

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