A novel approach to measure the cross section of the 18O(p, α)15n resonant reaction in the 0-200 keV energy range

M. La Cognata, C. Spitaleri, A. Mukhamedzhanov, A. Banu, S. Cherubini, A. Coc, V. Crucillà, V. Goldberg, M. Gulino, B. Irgaziev, G. G. Kiss, L. Lamia, J. Mrazek, R. G. Pizzone, S. M.R. Puglia, G. G. Rapisarda, S. Romano, M. L. Sergi, G. Tabacaru, L. TracheR. E. Tribble, W. Trzaska, A. Tumino

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Abstract

The 18O(p, α)15N reaction is of primary importance to pin down the uncertainties, due to nuclear physics input, affecting present-day models of asymptotic giant branch stars. Its reaction rate can modify both fluorine nucleosynthesis inside such stars and oxygen and nitrogen isotopic ratios, which allow one to constrain the proposed astrophysical scenarios. Thus, an indirect measurement of the low-energy region of the 18O(p, α)15N reaction has been performed to access, for the first time, the range of relevance for astrophysical application. In particular, a full, high-accuracy spectroscopic study of the 20 and 90 keV resonances has been performed and the strengths deduced to evaluate the reaction rate and the consequences for astrophysics.

Original languageEnglish
Pages (from-to)796-811
Number of pages16
JournalAstrophysical Journal
Volume708
Issue number1
DOIs
Publication statusPublished - 2010

Keywords

  • Nuclear reactions, nucleosynthesis, abundances
  • Stars: AGB and post-AGB
  • Stars: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    La Cognata, M., Spitaleri, C., Mukhamedzhanov, A., Banu, A., Cherubini, S., Coc, A., Crucillà, V., Goldberg, V., Gulino, M., Irgaziev, B., Kiss, G. G., Lamia, L., Mrazek, J., Pizzone, R. G., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Sergi, M. L., Tabacaru, G., ... Tumino, A. (2010). A novel approach to measure the cross section of the 18O(p, α)15n resonant reaction in the 0-200 keV energy range. Astrophysical Journal, 708(1), 796-811. https://doi.org/10.1088/0004-637X/708/1/796