The Influence of Production and Destruction of O Isotopes in Red Giant Stars

Ahmed Abdul-Razzaq Selman

doi:10.24996/ijs.2023.64.5.42

Authors

Ahmed Abdul-Razzaq Selman Department of Astronomy and Space, College of Science, University of Baghdad https://orcid.org/0000-0003-4943-7046

DOI:

https://doi.org/10.24996/ijs.2023.64.5.42

Keywords:

Nucleosynthesis, Astrophysics, Nuclear Physics, CNO Cycle, Reaction Rates, Stellar Physics

Abstract

Thermonuclear reaction rates are calculated for three oxygen isotopes ^14,15,16O in CNO cycles reactions occurring in red giant stars. These reactions are:, , , , and . Reaction rates have been calculated using Matlab codes, and related comparisons were made with NACRE II and Reaclib libraries, and the ratios of production to the destruction of ^15,16O isotopes were found. Present reaction rate results were close to most of the selected reactions, and in some cases larger with a factor of 1-3. ^15,16O production to destruction ratios indicated a special tendency to saturate at temperatures higher than ~ 2 GK, and these ratios were in general larger than 1 indicating an excess of producing such isotopes in red giant stars.