The 19F(α, p)22Ne Reaction at Energies of Astrophysical Relevance by Means of the Trojan Horse Method and Its Implications in AGB Stars

D'Agata, G. and Pizzone, R.G. and La Cognata, M. and Indelicato, I. and Spitaleri, C. and Palmerini, S. and Trippella, O. and Vescovi, D. and Blagus, Saša and Cherubini, S. and Figuera, P. and Grass, L. and Guardo, G.L. and Gulino, M. and Hayakawa, S. and Kshetri, R. and Lamia, L. and Lattuada, M. and Mijatović, Tea and Milin, Matko and Miljanić, Đuro and Prepolec, Lovro and Rapisarda, G.G. and Romano, S. and Sergi, M.L. and Skukan, Natko and Soić, Neven and Tokić, Vedrana and Tumino, A. and Uroić, Milivoj (2018) The 19F(α, p)22Ne Reaction at Energies of Astrophysical Relevance by Means of the Trojan Horse Method and Its Implications in AGB Stars. Astrophysical Journal, 860 (1). ISSN 0004-637X

[img]
Preview
PDF - Published Version
Language: English

Download (2MB) | Preview

Abstract

The main source of F-19 in the universe has not yet been clearly identified and this issue represents one of the unanswered questions of stellar modeling. This lack of knowledge can be due to the F-19(alpha, p)Ne-22 reaction cross-section that has proven to be difficult at low energies: direct measurements stop only at about similar to 660 keV, leaving roughly half of the astrophysical relevant energy region (from 200 keV to 1.1 MeV) explored only by R-matrix calculations. In this work, we applied the Trojan Horse Method to the quasi-free three-body Li-6(F-19, p(22)Ne)d reaction performed at E-beam = 6 MeV in order to indirectly study the F-19(alpha, p)Ne-22 reaction in the sub-Coulomb energy region. In this way, we obtained the cross-section and the reaction rate in the temperature region of interest for astrophysics and free from electron screening effects. A brief analysis of the impact of the new measured reaction rate in AGB star nucleosynthesis is also presented.

Item Type: Article
Keywords: asymptotic giant branch, thermonuclear reaction-rates, wolf-rayet stars, cross-sections, fluorine, f-19, nucleosynthesis, abundances, resonances, CNO
Date: 2018
Number of Pages: 11
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2018. The American Astronomical Society. Received 2018 January 16; Revised 2018 March 27; Accepted 2018 April 27; Published 2018 June 12.
Divisions: Faculty of Science > Department of Physics
Publisher: IOP Publishing
Depositing User: Matko Milin
Date Deposited: 27 Mar 2019 16:48
Last Modified: 27 Mar 2019 16:48
URI: http://digre.pmf.unizg.hr/id/eprint/5901

Actions (login required)

View Item View Item