Examination of the Low-Energy Enhancement of the gamma-ray Strength Function of 56Fe

A model-independent technique was used to determine the γ -ray strength function ( γ SF ) of 56 Fe down to γ -ray energies less than 1 MeV for the first time with GRETINA using the (p,p′ ) reaction at 16 MeV. No difference was observed in the energy dependence of the γ SF built on 2+ and 4+ final st...

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Veröffentlicht in:Physical review. C 2018
Hauptverfasser: Jones, M.D, Macchiavelli, Augusto Oswaldo, Wiedeking, Mathis, Bernstein, Lee A, Crawford, Heather L, Campbell, C.M, Clark, Rod M, Cromaz, Mario, Fallon, Paul, Lee, I-Yang, Salathe, M, Wiens, Andreas, Ayangeakaa, A.D, Bleuel, Darren L, Bottoni, S, Carpenter, M.P, Davids, H.M, Elson, J, Görgen, Andreas, Guttormsen, Magne Sveen, Janssens, R.V.F, Kinnison, J.E, Kirsch, Leo, Larsen, Ann-Cecilie, Lauritsen, Torben, Reviol, Walter, Sarantites, Demetrios G, Siem, Sunniva, Voinov, A.V, Zhu, S
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Sprache:nor
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Zusammenfassung:A model-independent technique was used to determine the γ -ray strength function ( γ SF ) of 56 Fe down to γ -ray energies less than 1 MeV for the first time with GRETINA using the (p,p′ ) reaction at 16 MeV. No difference was observed in the energy dependence of the γ SF 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.
ISSN:2469-9985
2469-9993
DOI:10.1103/PhysRevC.97.024327