A model-independent technique was used to determine the γ-ray strength function (γSF) of Fe56 down to γ-ray energies less than 1 MeV for the first time with GRETINA using the (p,pâ²) reaction at 16 MeV. No difference was observed in the energy dependence of the γSF 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.
Examination of the low-energy enhancement of the gamma-ray strength function of Fe-56 / M.D. Jones, A.O. Macchiavelli, M. Wiedeking, L.A. Bernstein, H.L. Crawford, C.M. Campbell, R.M. Clark, M. Cromaz, P. Fallon, I.Y. Lee, M. Salathe, A. Wiens, A.D. Ayangeakaa, D.L. Bleuel, S. Bottoni, M.P. Carpenter, H.M. Davids, J. Elson, A. Görgen, M. Guttormsen, R.V.F. Janssens, J.E. Kinnison, L. Kirsch, A.C. Larsen, T. Lauritsen, W. Reviol, D.G. Sarantites, S. Siem, A.V. Voinov, S. Zhu. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 97:2(2018), pp. 024327.1-024327.6. [10.1103/PhysRevC.97.024327]
Examination of the low-energy enhancement of the gamma-ray strength function of Fe-56
S. Bottoni;
2018
Abstract
A model-independent technique was used to determine the γ-ray strength function (γSF) of Fe56 down to γ-ray energies less than 1 MeV for the first time with GRETINA using the (p,pâ²) reaction at 16 MeV. No difference was observed in the energy dependence of the γSF 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.
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