Fine-tunings in radiative $α$-particle capture on $^{12}$C at astrophysical energies
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| Format: | Preprint |
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2026
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| _version_ | 1866915985488871424 |
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| author | Meißner, Ulf-G. Metsch, Bernard Ch. Meyer, Helen |
| author_facet | Meißner, Ulf-G. Metsch, Bernard Ch. Meyer, Helen |
| contents | We investigate the fine-tuning of radiative alpha-particle capture on carbon, $α(^{12}{\rm C},^{16}{\rm O})γ$, at astrophysical energies. Utilizing results from cluster effective field theory for this reaction, we find that the low-energy data of the astrophysical S-factor allow for only very small variations in the electromagnetic fine-structure constant $α$, namely $|δα/α| \leq 0.2\,$ per mille, in both the $E1$ and the $E2$ radiative capture. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_11180 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Fine-tunings in radiative $α$-particle capture on $^{12}$C at astrophysical energies Meißner, Ulf-G. Metsch, Bernard Ch. Meyer, Helen Nuclear Theory Solar and Stellar Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory We investigate the fine-tuning of radiative alpha-particle capture on carbon, $α(^{12}{\rm C},^{16}{\rm O})γ$, at astrophysical energies. Utilizing results from cluster effective field theory for this reaction, we find that the low-energy data of the astrophysical S-factor allow for only very small variations in the electromagnetic fine-structure constant $α$, namely $|δα/α| \leq 0.2\,$ per mille, in both the $E1$ and the $E2$ radiative capture. |
| title | Fine-tunings in radiative $α$-particle capture on $^{12}$C at astrophysical energies |
| topic | Nuclear Theory Solar and Stellar Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2601.11180 |