Understanding the Low-Energy Enhancement of the $\gamma$-ray Strength Function of $^{56}$Fe

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

doi:10.1103/physrevc.97.024327

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arXiv · 1801.09668

Understanding the Low-Energy Enhancement of the $\gamma$-ray Strength Function of $^{56}$Fe

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Abstract

A model-independent technique was used to determine the $\gamma$-ray Strength Function ($\gamma$SF) of $^{56}$Fe down to $\gamma$-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 $\gamma$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.

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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. 2018-01-29. Understanding the Low-Energy Enhancement of the $\gamma$-ray Strength Function of $^{56}$Fe. https://doi.org/10.1103/physrevc.97.024327

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