Determination of S17(0) from published data

Abstract

The experimental landscape for the 7Be+p radiative capture reaction is rapidly changing as new high precision data become available. We present an evaluation of existing data, detailing the treatment of systematic errors and discrepancies, and show how they constrain the astrophysical S factor (S17), independent of any nuclear structure model. With theoretical models robustly determining the behavior of the sub-threshold pole, the extrapolation error can be reduced and a constraint placed on the slope of S17. Using only radiative capture data, we find S17(0) = 20.7 +/- 0.6 (stat) +/- 1.0 (syst) eV b if data sets are completely independent, while if data sets are completely correlated we find S17(0) = 21.4 +/- 0.5 (stat) +/- 1.4 (syst) eV b. The truth likely lies somewhere in between these two limits. Although we employ a formalism capable of treating discrepant data, we note that the central value of the S factor is dominated by the recent high precision data of Junghans et al., which imply a substantially higher value than other radiative capture and indirect measurements. Therefore we conclude that further progress will require new high precision data with a detailed error budget.

10 pages, 1 figure published version

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Cited by in corpus (10)

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• Effective field theory description of halo nuclei
• Evaluation of Modern 3He(alpha,gamma)7Be Data
• The activation method for cross section measurements in nuclear astrophysics
• Halo effective field theory constrains the solar Beryllium-7 + proton -> Boron-8 + photon rate
• Scattering of ${}^7$Be and ${}^8$B and the astrophysical S${}_{17}$ factor
• Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be
• Coupled-channels treatment of ${}^7\mathrm{Be}(p,\gamma {)}^8\mathrm{B}$ in effective field theory
• Breakup of loosely bound nuclei as indirect method in nuclear astrophysics: 8B, 9C, 23Al