n+p -> d+gamma for Big-Bang Nucleosynthesis

Details n+p -> d+gamma for Big-Bang Nucleosynthesis n+p -> d+gamma for Big-Bang Nucleosynthesis

1999-07-09

arxiv.org/abs/nucl-th/9907042v1

Phys.Rev. C60 (1999) 065205

Physics

Nuclear Physics

Nuclear Theory

11 pages, 3 figures, latex

Scientific paper

10.1103/PhysRevC.60.065205

The cross section for n+p -> d+gamma is calculated at energies relevant to big bang nucleosynthesis using the recently developed effective field theory that describes the two-nucleon sector. The E1 amplitude is computed up to NNNLO and depends only upon nucleon-nucleon phase shift data. In contrast, the M1 contribution is computed up to NLO, and the four-nucleon-one-magnetic-photon counterterm that enters is determined by the cross section for cold neutron capture. The uncertainty in the calculation for nucleon energies up to E ~ 1 MeV is estimated to be < 4%.

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