Determination of Astrophysical S Factor for 15N(p;γ)16O at Low-energies Within Effective Field Theory

초록

The radiative proton capture on 15N targets, i.e., 15N(p; γ)16O, is an important thermonuclear reaction of the CNO cycle in stellar environments. This reaction is a key process in the cycle because it initiates the NO cycle by producing 16O. In this study, we investigated the 15N(p; γ)16O reaction within the framework of cluster effective field theory. We construct an effective Lagrangian to describe the reaction at stellar energies and calculate the astrophysical S factor. The parameters of our calculations, such as low-energy constants, resonance energy, and decay width of the 16O resonance are determined by fitting empirical data of the S factor at the range of 72:8 keV ≤ Ecm ≤ 368:3 keV. The S factor value for this reaction at extremely low energy is then determined to be S E = 0 = 30:4 keV b, which is consistent with the estimates of R-matrix approaches. © 2022 The Korean Physical Society. All rights reserved.

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