High accuracy O-18(p, alpha)N-15 reaction rate in the 8 . 10(6)-5 . 10(9) K temperature range

0486760 - ÚJF 2018 US eng C - Konferenční příspěvek (zahraniční konf.)
La Cognata, M. - Spitaleri, C. - Mukhamedzhanov, A. - 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. - Tribble, R. E. - Trzaska, W. - Tumino, A.
High accuracy O-18(p, alpha)N-15 reaction rate in the 8 . 10(6)-5 . 10(9) K temperature range.
AIP Conferenece Proceedings. Vol. 1377. Melville: American Institute of Physics, 2011, s. 195-199. ISBN 978-0-7354-0937-8. ISSN 0094-243X.
[3rd International Conference on Frontiers in Nuclear Structure, Astrophysics and Reactions (FINUSTAR). Rhodes (GR), 23.08.2010-27.08.2010]
Institucionální podpora: RVO:61389005
Klíčová slova: nuclear reactions * nycleosynthesis * abundances
Obor OECD: Astronomy (including astrophysics,space science)

The O-18(p, alpha)N-15 reaction is of great importance in several astrophysical scenarios, as it influences the production of key isotopes such as F-19, O-18 and N-15. In this work, a high accuracy O-18(p, alpha) N-15 reaction rate is proposed, based on the simultaneous fit of direct measurements and of the results of a new Trojan Horse experiment. In particular, we have focused on the study of the broad 660 keV 1/2(+) resonance. Since Gamma similar to 100 - 300 keV, it strongly influences the nearly-zero-energy region of the cross section by means of the low-energy tail of the resonant contribution and dominates the cross section at higher energies. Here we provide a factor of 2 larger reaction rate above T similar to 0.510(9) K based over our new improved determination of its resonance parameters.
Trvalý link: http://hdl.handle.net/11104/0281489