Abstract.
In this work we study the radiative capture of 3He on 4He within the halo effective field theory (EFT) framework. At leading order the capture amplitude comprises the initial state s-wave strong and Coulomb interactions summed to all orders. At the same order in the expansion, leading two-body currents contribute as well. We find delicate cancelations between the various contributions, and the two-body current contributions can be replaced by appropriately enhancing the asymptotic normalizations of the 7Be ground and first excited state wave functions. The next-to-leading order corrections come from the s-wave shape parameter and the pure Coulomb d-wave initial state interactions. We fit the EFT parameters to available scattering data and most recent capture data. Our zero-energy astrophysical S-factor estimate, \(S_{34}\sim 0.55\) keV b, is consistent within error bars with the average in the literature.
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Higa, R., Rupak, G. & Vaghani, A. Radiative 3He(\(\alpha , \gamma\))7Be reaction in halo effective field theory. Eur. Phys. J. A 54, 89 (2018). https://doi.org/10.1140/epja/i2018-12486-5
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DOI: https://doi.org/10.1140/epja/i2018-12486-5