$^{14}$N(p,$γ)^{15}$O $S$ factor and the puzzling solar composition problem
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
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2026
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| _version_ | 1866915891477741568 |
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| author | Dong, G. X. Wang, X. B. Michel, N. Płoszajczak, M. |
| author_facet | Dong, G. X. Wang, X. B. Michel, N. Płoszajczak, M. |
| contents | In stellar hydrogen burning, the CNO cycle dominates, with the $^{14}$N(p,$γ)^{15}$O reaction being the slowest process. Consequently, this reaction critically influences the solar composition, CNO neutrino fluxes, and the evolution of star clusters and galaxies. Recent direct measurements of $^{14}$N(p,$γ)^{15}$O have reported an enhanced astrophysical $S$-factor. This work presents a microscopic theoretical study of the $^{14}$N(p,$γ)^{15}$O reaction using the Gamow shell model in the coupled-channel representation (GSM-CC). The calculations achieve good agreement with experimental data for both the total $S$-factors and the separate contributions from transitions to the ground state and excited states of $^{15}\mathrm{O}$. However, the predicted $S$-factor at zero energy exceeds the experimental value. Based on the computed $S$-factors, the derived carbon and nitrogen abundances align closely with predictions from recent $^{14}$N(p,$γ)^{15}$O cross-section measurements, yet remain significantly lower than the latest solar neutrino observation values. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_07056 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | $^{14}$N(p,$γ)^{15}$O $S$ factor and the puzzling solar composition problem Dong, G. X. Wang, X. B. Michel, N. Płoszajczak, M. Nuclear Theory In stellar hydrogen burning, the CNO cycle dominates, with the $^{14}$N(p,$γ)^{15}$O reaction being the slowest process. Consequently, this reaction critically influences the solar composition, CNO neutrino fluxes, and the evolution of star clusters and galaxies. Recent direct measurements of $^{14}$N(p,$γ)^{15}$O have reported an enhanced astrophysical $S$-factor. This work presents a microscopic theoretical study of the $^{14}$N(p,$γ)^{15}$O reaction using the Gamow shell model in the coupled-channel representation (GSM-CC). The calculations achieve good agreement with experimental data for both the total $S$-factors and the separate contributions from transitions to the ground state and excited states of $^{15}\mathrm{O}$. However, the predicted $S$-factor at zero energy exceeds the experimental value. Based on the computed $S$-factors, the derived carbon and nitrogen abundances align closely with predictions from recent $^{14}$N(p,$γ)^{15}$O cross-section measurements, yet remain significantly lower than the latest solar neutrino observation values. |
| title | $^{14}$N(p,$γ)^{15}$O $S$ factor and the puzzling solar composition problem |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2603.07056 |