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Indirect measurement of O-17(p,alpha)N-14 cross section at ultra-low energies
Sergi, M. L. ; Spitaleri, C. ; Coc, A. ; Mukhamedzhanov, A. ; Burjan, Václav ; Cherubini, S. ; Crucilla, V. ; Gulino, M. ; Hammache, F. ; Hons, Zdeněk ; Irgaziev, B. ; Kiss, G. G. ; Kroha, Václav ; La Cognata, M. ; Lamia, L. ; Pizzone, R. G. ; Puglia, S. M. R. ; Rapisarda, G. G. ; Romano, S. ; de Sereville, N. ; Somorjai, E. ; Tudisco, S. ; Tumino, A.
The indirect measurement of O-17(p,alpha)N-14 cross section was performed by means of the Trojan Horse Method. This approach allowed to investigate the ultra-low energy range (E-c.m.= 0-300 keV) relevant for several astrophysics environments, where two resonant levels of F-18 at E-c.m.(R) = 65 keV and E-c.m.(R) = 183 keV play a significant role in the reaction rate determination.
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First measurement of the O-18(p, alpha)N-15 cross section at astrophysical energies
La Cognata, M. ; Spitaleri, C. ; Mukhamedzhanov, A. ; Tribble, R. E. ; Al-Abdullah, T. ; Banu, A. ; Cherubini, S. ; Coc, A. ; Crucilla, V. ; Goldberg, V. ; Gulino, M. ; Irgaziev, B. ; Kiss, G. G. ; Lamia, L. ; Mrázek, Jaromír ; Pizzone, R. G. ; Puglia, S. M. R. ; Rapisarda, G. G. ; Romano, S. ; Sergi, M. L. ; Tabacaru, G. ; Trache, L. ; Trzaska, W. ; Tudisco, S. ; Tumino, A.
The O-18(p, alpha)N-15 reaction rate has been deduced by means of the Trojan horse method. For the first time the contribution of the 20 keV resonance has been directly evaluated, giving a value about 35% larger than the one in the literature. Moreover, the present approach has allowed to improve the accuracy by a factor 8.5, as it is based on the measured strength instead of spectroscopic measurements. The contribution of the 90 keV resonance has been also determined, which turned out to be of negligible importance to astrophysics.
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