High Resolution Study of $^{40}$Ca to Constrain Potassium Nucleosynthesis in NGC 2419
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866910295488724992 |
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| author | Fox, William Longland, Richard Marshall, Caleb Chaves, Federico Portillo |
| author_facet | Fox, William Longland, Richard Marshall, Caleb Chaves, Federico Portillo |
| contents | The globular cluster NGC 2419 was the first to exhibit a Mg-K anticorrelation, linked to hydrogen burning at temperatures between 80-260 MK. However, the key K-destroying reaction, $^{39}\mathrm{K}(p,γ)^{40}\mathrm{Ca}$, has a large rate uncertainty in this range. We significantly constrain this rate with a high resolution $^{39}\mathrm{K}(^{3}\mathrm{He},d)^{40}\mathrm{Ca}$ study. We resolve the E$_{\text{r}}^{\text{c.m.}} = 154$ keV resonance in $^{39}\mathrm{K}+p$ for the first time, increasing the previous rate by up to a factor 13 and reducing its $1σ$ width by up to a factor of 42. Reaction network calculations for NGC 2419 suggest that this could lower temperatures needed to reproduce the Mg-K anticorrelation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_06754 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High Resolution Study of $^{40}$Ca to Constrain Potassium Nucleosynthesis in NGC 2419 Fox, William Longland, Richard Marshall, Caleb Chaves, Federico Portillo Nuclear Experiment Solar and Stellar Astrophysics The globular cluster NGC 2419 was the first to exhibit a Mg-K anticorrelation, linked to hydrogen burning at temperatures between 80-260 MK. However, the key K-destroying reaction, $^{39}\mathrm{K}(p,γ)^{40}\mathrm{Ca}$, has a large rate uncertainty in this range. We significantly constrain this rate with a high resolution $^{39}\mathrm{K}(^{3}\mathrm{He},d)^{40}\mathrm{Ca}$ study. We resolve the E$_{\text{r}}^{\text{c.m.}} = 154$ keV resonance in $^{39}\mathrm{K}+p$ for the first time, increasing the previous rate by up to a factor 13 and reducing its $1σ$ width by up to a factor of 42. Reaction network calculations for NGC 2419 suggest that this could lower temperatures needed to reproduce the Mg-K anticorrelation. |
| title | High Resolution Study of $^{40}$Ca to Constrain Potassium Nucleosynthesis in NGC 2419 |
| topic | Nuclear Experiment Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2401.06754 |