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The fluorine destruction in stars: first experimental study of the (19)F(p, alpha(0))(16)O reaction at astrophysical energies

M. La Cognata A.M. Mukhamedzhanov C. Spitaleri I. Indelicato M. Aliotta V. Burjan S. Cherubini A. Coc 1 M. Gulino Z. Hons G.G. Kiss V. Kroha L. Lamia J. Mrazek S. Palmerini S. Piskor R.G. Pizzone S.M.R. Puglia G.G Rapisarda S. Romano M.L. Sergi A. Tumino
1 CSNSM AN
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : The (19)F(p, alpha)(16)O reaction is an important fluorine destruction channel in the proton-rich outer layers of asymptotic giant branch (AGB) stars and it might also play a role in hydrogen-deficient post-AGB star nucleosynthesis. So far, available direct measurements do not reach the energy region of astrophysical interest (E(cm) less than or similar to 300 keV), because of the hindrance effect of the Coulomb barrier. The Trojan Horse (TH) method was thus used to access this energy region, by extracting the quasi-free contribution to the (2)H((19)F, alpha(16)O)n and the (19)F((3)He, alpha(16)O)d reactions. The TH measurement of the alpha(0) channel shows the presence of resonant structures not observed before, which cause an increase of the reaction rate at astrophysical temperatures up to a factor of 1.7, with potential consequences for stellar nucleosynthesis.
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Submitted on : Wednesday, October 12, 2011 - 9:57:31 AM
Last modification on : Friday, November 27, 2020 - 11:24:20 AM

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M. La Cognata, A.M. Mukhamedzhanov, C. Spitaleri, I. Indelicato, M. Aliotta, et al.. The fluorine destruction in stars: first experimental study of the (19)F(p, alpha(0))(16)O reaction at astrophysical energies. The Astrophysical journal letters, Bristol : IOP Publishing, 2011, 739, pp.L54. ⟨10.1088/2041-8205/739/2/L54⟩. ⟨in2p3-00631319⟩

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