期刊
EUROPEAN PHYSICAL JOURNAL A
卷 54, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1140/epja/i2018-12486-5
关键词
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资金
- Joint Institute for Nuclear Physics and Applications at Oak Ridge National Laboratory
- Department of Physics, University of Tennessee
- U.S. NSF [PHY-1307453, PHY-1615092]
- Brazilian agency [FAPESP-2012/50984-4]
- Brazilian project INCT-FNA [464898/2014-5]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1615092] Funding Source: National Science Foundation
In this work we study the radiative capture of He-3 on He-4 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 Be-7 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 similar to 0.55 keV b, is consistent within error bars with the average in the literature.
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