Halo effective field theory constrains the solar 7Be + p → 8B + γ rate

Zhang, Xilin; Nollett, Kenneth M.; Phillips, D. R.

doi:10.1016/j.physletb.2015.11.005

Title: Halo effective field theory constrains the solar 7Be + p → 8B + γ rate

Journal Article · Tue Dec 01 00:00:00 EST 2015 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2015.11.005· OSTI ID:1225405

; Nollett, Kenneth M.; Phillips, D. R.

In this study, we report an improved low-energy extrapolation of the cross section for the process ⁷Be(p,γ)⁸B, which determines the ⁸B neutrino flux from the Sun. Our extrapolant is derived from Halo Effective Field Theory (EFT) at next-to-leading order. We apply Bayesian methods to determine the EFT parameters and the low-energy S-factor, using measured cross sections and scattering lengths as inputs. Asymptotic normalization coefficients of ⁸B are tightly constrained by existing radiative capture data, and contributions to the cross section beyond external direct capture are detected in the data at E < 0.5 MeV. Most importantly, the S-factor at zero energy is constrained to be S(0) = 21.3 ± 0.7 eV b, which is an uncertainty smaller by a factor of two than previously recommended. That recommendation was based on the full range for S(0) obtained among a discrete set of models judged to be reasonable. In contrast, Halo EFT subsumes all models into a controlled low-energy approximant, where they are characterized by nine parameters at next-to-leading order. These are fit to data, and marginalized over via Monte Carlo integration to produce the improved prediction for S(E).

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Research Organization:: Ohio Univ., Athens, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-93ER40756; FG02-97ER41014; SC0010300; FG02-09ER41621

OSTI ID:: 1225405

Alternate ID(s):: OSTI ID: 1240089

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 751 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 42 works

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