Coupled-channels treatment of $^7\mathrm{Be}(p,γ)^8\mathrm{B}$ in effective field theory
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2020
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| _version_ | 1866910516341899264 |
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| author | Higa, Renato Premarathna, Pradeepa Rupak, Gautam |
| author_facet | Higa, Renato Premarathna, Pradeepa Rupak, Gautam |
| contents | The E1 and M1 contributions to $^7\mathrm{Be}(p,γ)^8\mathrm{B}$ at low energies are calculated in halo effective field theory. The excited $^7\mathrm{Be}^\star$ core is included as an explicit degree of freedom in a coupled-channels calculation. The E1 transition is calculated up to next-to-next-to-leading order. The leading contribution from M1 transition that gives significant contribution in a narrow energy region around the $1^+$ resonance state of $^8$B is included. We compare our results with previous halo effective field theory calculations that also included the $^7\mathrm{Be}^\star$ as an explicit degree of freedom. We disagree with these previous calculations in both the formal expressions and also in the analysis. Bayesian inference of the data gives $S_{17}(0)=21.0(7)$ eV b when combined with the expected theory error. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2010_13003 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Coupled-channels treatment of $^7\mathrm{Be}(p,γ)^8\mathrm{B}$ in effective field theory Higa, Renato Premarathna, Pradeepa Rupak, Gautam Nuclear Theory Solar and Stellar Astrophysics Nuclear Experiment The E1 and M1 contributions to $^7\mathrm{Be}(p,γ)^8\mathrm{B}$ at low energies are calculated in halo effective field theory. The excited $^7\mathrm{Be}^\star$ core is included as an explicit degree of freedom in a coupled-channels calculation. The E1 transition is calculated up to next-to-next-to-leading order. The leading contribution from M1 transition that gives significant contribution in a narrow energy region around the $1^+$ resonance state of $^8$B is included. We compare our results with previous halo effective field theory calculations that also included the $^7\mathrm{Be}^\star$ as an explicit degree of freedom. We disagree with these previous calculations in both the formal expressions and also in the analysis. Bayesian inference of the data gives $S_{17}(0)=21.0(7)$ eV b when combined with the expected theory error. |
| title | Coupled-channels treatment of $^7\mathrm{Be}(p,γ)^8\mathrm{B}$ in effective field theory |
| topic | Nuclear Theory Solar and Stellar Astrophysics Nuclear Experiment |
| url | https://arxiv.org/abs/2010.13003 |