Activation measurement of the 3He(alpha,gamma)7Be cross section at low energy

Abstract

The nuclear physics input from the 3He(alpha,gamma)7Be cross section is a major uncertainty in the fluxes of 7Be and 8B neutrinos from the Sun predicted by solar models and in the 7Li abundance obtained in big-bang nucleosynthesis calculations. The present work reports on a new precision experiment using the activation technique at energies directly relevant to big-bang nucleosynthesis. Previously such low energies had been reached experimentally only by the prompt-gamma technique and with inferior precision. Using a windowless gas target, high beam intensity and low background gamma-counting facilities, the 3He(alpha,gamma)7Be cross section has been determined at 127, 148 and 169 keV center-of-mass energy with a total uncertainty of 4%. The sources of systematic uncertainty are discussed in detail. The present data can be used in big-bang nucleosynthesis calculations and to constrain the extrapolation of the 3He(alpha,gamma)7Be astrophysical S-factor to solar energies.

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• The Impact of Recent Advances in Laboratory Astrophysics on our Understanding of the Cosmos
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• Constraining the ${}^7$Be($p,\gamma$)${}^8$B $S$-factor with the new precise ${}^7$Be solar neutrino flux from Borexino
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• New Theoretical Results for Radiative 3H(p, γ)4He, 3He(2H, γ)5Li, 4He(2H, γ)6Li, 4He(3H, γ)7Li, and 4He(3He, γ)7Be Captures At Astrophysical Energies
• Astrophysical ${}^3\mathrm{He}(\alpha ,\gamma {)}^7\mathrm{Be}$ and ${}^3\mathrm{H}(\alpha ,\gamma {)}^7\mathrm{Li}$ direct capture reactions in a potential model approach
• Isospin Effects on Astrophysical S-Factors
• Experimental determination of the ${}^3$He($\alpha$,$\gamma$)${}^7$Be reaction cross section above the ${}^7$Be proton separation threshold
• Solar Model Parameters and Direct Measurements of Solar Neutrino Fluxes
• The Astrophysical S-factor of the 12C(α,γ)16O Reaction at Solar Energies
• New results for the astrophysical S-factor and reaction rate of radiative 3He4He capture
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