The thermonuclear rate for the 19F(a,p)22Ne reaction at stellar temperatures

TL;DR

This study measures the reaction rates of $^{19}$F($ extalpha$,p)$^{22}$Ne at stellar energies, identifying new resonances and providing a refined rate crucial for understanding fluorine depletion in stars.

Contribution

It presents new experimental data and a detailed R-matrix analysis to determine an improved reaction rate for $^{19}$F($ extalpha$,p)$^{22}$Ne, reducing uncertainties in stellar models.

Findings

Identification of previously unobserved resonances.

Determination of level parameters through R-matrix analysis.

Provision of a new reaction rate based on experimental data.

Abstract

The $^{19}$F($\alpha$,p)$^{22}$Ne reaction is considered to be one of the main sources of fluorine depletion in AGB and Wolf-Rayet stars. The reaction rate still retains large uncertainties due to the lack of experimental studies available. In this work the yields for both exit channels to the ground state and first excited state of $^{22}$Ne have been measured and several previously unobserved resonances have been found in the energy range E$_{lab}$=792-1993 keV. The level parameters have been determined through a detailed R-matrix analysis of the reaction data and a new reaction rate is provided on the basis of the available experimental information.