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

Here, 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.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [4] ;  [1] ;  [5] ;  [6]
  1. Univ. of Oslo, Oslo (Norway)
  2. INFN, Milano (Italy)
  3. INFN, Milano (Italy); Univ. of Milano, Milano (Italy)
  4. Univ. of Oslo, Oslo (Norway); MTA ATOMKI, Debrecen (Hungary)
  5. Ohio Univ. Athens, OH (United States)
  6. iThemba LABS, Somerset West (South Africa)
Publication Date:
Grant/Contract Number:
NA0001837; FG02-88ER40387
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 24; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Ohio Univ., Athens, OH (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Gamma strength function
OSTI Identifier:
1256982

Larsen, A. C., Blasi, N., Bracco, A., Camera, F., Eriksen, T. K., Gorgen, A., Guttormsen, M., Hagen, T. W., Leoni, S., Million, B., Nyhus, H. T., Renstrom, T., Rose, S. J., Ruud, I. E., Siem, S., Tornyi, T., Tveten, G. M., Voinov, A. V., and Wiedeking, M.. Evidence for the dipole nature of the low-energy γ enhancement in Fe56. United States: N. p., Web. doi:10.1103/PhysRevLett.111.242504.
Larsen, A. C., Blasi, N., Bracco, A., Camera, F., Eriksen, T. K., Gorgen, A., Guttormsen, M., Hagen, T. W., Leoni, S., Million, B., Nyhus, H. T., Renstrom, T., Rose, S. J., Ruud, I. E., Siem, S., Tornyi, T., Tveten, G. M., Voinov, A. V., & Wiedeking, M.. Evidence for the dipole nature of the low-energy γ enhancement in Fe56. United States. doi:10.1103/PhysRevLett.111.242504.
Larsen, A. C., Blasi, N., Bracco, A., Camera, F., Eriksen, T. K., Gorgen, A., Guttormsen, M., Hagen, T. W., Leoni, S., Million, B., Nyhus, H. T., Renstrom, T., Rose, S. J., Ruud, I. E., Siem, S., Tornyi, T., Tveten, G. M., Voinov, A. V., and Wiedeking, M.. 2013. "Evidence for the dipole nature of the low-energy γ enhancement in Fe56". United States. doi:10.1103/PhysRevLett.111.242504. https://www.osti.gov/servlets/purl/1256982.
@article{osti_1256982,
title = {Evidence for the dipole nature of the low-energy γ enhancement in Fe56},
author = {Larsen, A. C. and Blasi, N. and Bracco, A. and Camera, F. and Eriksen, T. K. and Gorgen, A. and Guttormsen, M. and Hagen, T. W. and Leoni, S. and Million, B. and Nyhus, H. T. and Renstrom, T. and Rose, S. J. and Ruud, I. E. and Siem, S. and Tornyi, T. and Tveten, G. M. and Voinov, A. V. and Wiedeking, M.},
abstractNote = {Here, 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.},
doi = {10.1103/PhysRevLett.111.242504},
journal = {Physical Review Letters},
number = 24,
volume = 111,
place = {United States},
year = {2013},
month = {12}
}