First Measurement of the 19F(α, p)22Ne Reaction at Energies of Astrophysical Relevance

Pizzone, R. G. and D'Agata, G. and La Cognata, M. and Indelicato, I. and Spitaleri, C. and Blagus, S. and Cherubini, S. and Figuera, P. and Grassi, 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 (2017) First Measurement of the 19F(α, p)22Ne Reaction at Energies of Astrophysical Relevance. Astrophysical Journal, 836 (1). pp. 57-6. ISSN 0004-637X

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Abstract

The observational 19F abundance in stellar environments systematically exceeds the predicted one, thus representing one of the unsolved challenges for stellar modeling. It is therefore clear that further investigation is needed in this field. In this work, we focus our attention on the measurement of the 19F(α, p) 22Ne reaction in the astrophysical energy range, between 0.2 and 0.8 MeV (far below the Coulomb barrier, 3.8 MeV), as it represents the main destruction channel in He-rich environments. The lowest energy at which this reaction has been studied with direct measurements is ∼0.66 MeV, covering only the upper tail of the Gamow window, causing the reaction-rate evaluation to be based on extrapolation. To investigate lower energies, the 19F(α, p) 22Ne reaction has been studied by means of the Trojan horse method, applied to the quasi-free 6Li (19F, p22Ne)2H reaction at Ebeam = 6 MeV. The indirect cross section of the 19F(α, p) 22Ne reaction at energies ≲1 MeV was extracted, fully covering the astrophysical region of interest and overlapping existing direct data for normalization. Several resonances have been detected for the first time inside the Gamow window. The reaction rate has been calculated, showing an increase up to a factor of 4 with respect to the literature at astrophysical temperatures. This might lead to potential major astrophysical implications.

Item Type: Article
Keywords: nuclear reactions, nucleosynthesis, abundances
Date: 8 February 2017
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2017. The American Astronomical Society. All rights reserved. Received 2016 December 21; revised 2017 January 10; accepted 2017 January 10; published 2017 February 8.
Divisions: Faculty of Science > Department of Physics
Publisher: IOP Publishing
Depositing User: Matko Milin
Date Deposited: 15 Mar 2017 12:09
Last Modified: 15 Mar 2017 12:09
URI: http://digre.pmf.unizg.hr/id/eprint/5456

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