Evidence for the dipole nature of the low-energy γ enhancement in 56Fe.
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'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.
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Larsen
INFN, Sezione di Milano, I-20133 Milano, Italy.
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Blasi
INFN, Sezione di Milano, I-20133 Milano, Italy and Dipartimento di Fisica, University of Milano, I-20122 Milano, Italy.
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Bracco
INFN, Sezione di Milano, I-20133 Milano, Italy and Dipartimento di Fisica, University of Milano, I-20122 Milano, Italy.
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Camera
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Eriksen
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Görgen
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Guttormsen
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Hagen
INFN, Sezione di Milano, I-20133 Milano, Italy and Dipartimento di Fisica, University of Milano, I-20122 Milano, Italy.
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Leoni
INFN, Sezione di Milano, I-20133 Milano, Italy.
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Million
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Nyhus
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Renstrøm
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Rose
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Ruud
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Siem
Department of Physics, University of Oslo, N-0316 Oslo, Norway and Institute of Nuclear Research, MTA ATOMKI, H-4026 Debrecen, Hungary.
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Tornyi
Department of Physics, University of Oslo, N-0316 Oslo, Norway.
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Tveten
Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
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Voinov
iThemba LABS, Post Office Box 722, 7129 Somerset West, South Africa.
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Wiedeking