Evidence for dipole nature of the low-energy $\gamma$ enhancement in $^{56}$Fe
| Autor: | Larsen, A. C., Blasi, N., Bracco, A., Camera, F., Eriksen, T. K., Görgen, A., Guttormsen, M., Hagen, T. W., Leoni, S., Million, B., Nyhus, H. T., Renstrøm, T., Rose, S. J., Ruud, I. E., Siem, S., Tornyi, T., Tveten, G. M., Voinov, A. V., Wiedeking, M. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 111, 242504 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.111.242504 |
| Popis: | The $\gamma$-ray strength function of $^{56}$Fe has been measured from proton-$\gamma$ coincidences for excitation energies up to $\approx 11$ MeV. The low-energy enhancement in the $\gamma$-ray strength function, which was first discovered in the ($^3$He,$\alpha\gamma$)$^{56}$Fe reaction, is confirmed with the ($p,p^\prime\gamma$)$^{56}$Fe experiment reported here. Angular distributions of the $\gamma$ rays give for the first time evidence that the enhancement is dominated by dipole transitions. Comment: 5 pages, 4 figures. Version accepted for publication in Phys. Rev. Letters |
| Databáze: | arXiv |
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