Precision calculation of 3He(α, γ)7Be for solar physics
Abstract
We calculate the cross section for radiative capture 3 He( α, γ ) 7 Be at next-to-next-to-leading order (NNLO). At this order of perturbation, momentum dependent two-body currents make their first appearance. We provide a model-independent construction of these currents from gauge and Galilean invariance, where the general framework for constructing higher-order two-body currents in low-energy effective field theories becomes evident. The 3 He( α, γ ) 7 Be astrophysical S-factor S 34 ( 0 ) = 0 . 564 − 0.015 + 0.017 k eV b is obtained from a Bayesian analysis at NNLO, with an additional nominal theoretical uncertainty ± 0.017 keVb of 3%.
Fields of Study & Subjects
Nuclear physics research studies
Nuclear reactor physics and engineering
Astro and Planetary Science
Publication details
- Journal / source
- Physics Letters B
- Publisher
- Elsevier BV
- Volume
- 880
- Pages
- 140654–140654
- Publication date
- 27 June 2026
- Language
- EN