New Improved Indirect Measurement of the 19F(p, α)16O Reaction at Energies of Astrophysical Relevance

• DOI: 10.3847/1538-4357/aa7de7
• Publication Date: 2017-08-07T12:13:41Z
• Authors: I. Indelicato; M. La Cognata; C. Spitaleri; V. Burjan; S. Cherubini; M. Gulino; S. Hayakawa; Z. Hons; V. Kroha; L. Lamia; M. Mazzocco; J. Mrazek; R. G. Pizzone; S. Romano; E. Strano; D. Torresi; A. Tumino
• Keywords: abundances; nuclear reactions; nucleosynthesis; Astronomy and Astrophysics; Space and Planetary Science; Space and Planetary Science; 0103 physical sciences; Astronomy and Astrophysics; 01 natural sciences; Abundances, nuclear reactions, nucleosynthesis, Astronomy and Astrophysics, Space and Planetary Science.

Abstract Fluorine abundance determination is of great importance in stellar physics to understand s-elements production and mixing processes asymptotic giant branch (AGB) stars. Up now, theoretical models overproduce F abundances AGB stars with respect the observed values, thus calling for further investigation reactions involving fluorine. In particular, 19 F( p , α ) 16 O reaction main destruction channel fluorine at bottom convective envelope stars, an H-rich environment where it can experience temperatures high enough determine its destruction, owing additional processes. this paper Trojan horse method (THM) was used extract 0 S-factor energy range astrophysical interest ( E cm ≈ 0–1 MeV). This most relevant low (few 10 7 K) characterizing envelope, according current knowledge. A previous indirect experiment using THM has three resonances regions below 450 keV. These energies correspond typical temperatures, implying a significant increase rate. Statistics are scarce performing accurate separation between resonances, preventing one from drawing quantitative conclusion about their total widths spin parities. Before measurement, only extrapolations were available 500 keV, showing non-resonant behavior that sharply contradicts trend factor higher energies. new been performed verify measured TH perform more spectroscopy involved resonances.