New Astrophysical Reaction Rate for the $^{12}\textrm{C}(\alpha,\gamma)^{16}\textrm{O}$ Reaction

TL;DR

This paper presents a newly evaluated astrophysical reaction rate for the $^{12}$C($ extalpha, extgamma$)$^{16}$O process, crucial for stellar evolution, based on comprehensive experimental data fitting.

Contribution

It introduces a new reaction rate for $^{12}$C($ extalpha, extgamma$)$^{16}$O derived from global R-matrix analysis of experimental data, covering a wide temperature range.

Findings

Reaction rate at $T_9$=0.2 is (7.83 ± 0.35)×10^{15} cm^3 mol^{-1} s^{-1}

Reaction rates provided in tabular and analytical forms for 0.04 ≤ $T_9$ ≤ 10

Enhanced accuracy in stellar helium burning modeling

Abstract

A new astrophysical reaction rate for $^{12}$C($\alpha,\gamma$)$^{16}$O has been evaluated on the basis of a global R-matrix fitting to the available experimental data. The reaction rates of $^{12}$C($\alpha,\gamma$)$^{16}$O for stellar temperatures between 0.04 $\leq$ $T_9$ $\leq$ 10 are provided in a tabular form and by an analytical fitting expression. At $T_9$ = 0.2, the reaction rate is (7.83 $\pm$ 0.35)$\times10^{15}$ $\rm{cm^3 mol^{-1} s^{-1}}$, where stellar helium burning occurs.