Coupled-channels treatment of Be-7(p, gamma) B-8 in effective field theory

Autor(es)

Higa, Renato ; Premarathna, Pradeepa ; Rupak, Gautam

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW C; v. 106, n. 1, p. 20-pg., 2022-07-05.

Resumo

The E1 and M1 contributions to Be-7(p, gamma)B-8 at low energies are calculated in halo effective field theory. The excited Be-7(*) 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 B-8 is included. We compare our results with previous halo effective field theory calculations that also included the Be-7(*) 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. (AU)

• Processo FAPESP: 19/07767-1 - Reações nucleares com núcleos fracamente ligados ou com estrutura de cluster, radioativos e estáveis
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