np{yields}d{gamma} for big-bang nucleosynthesis

Journal Article · Wed Dec 01 00:00:00 EST 1999 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.60.065205· OSTI ID:20218018

Chen, Jiunn-Wei ^[1]; Savage, Martin J ^[1]

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1. Department of Physics, University of Washington, Seattle, Washington 98915 (United States)

The cross section for np{yields}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 N{sup 3}LO and depends only upon nucleon-nucleon phase shift data. In contrast, the M1 contribution is computed up to next-to-leading order, 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{approx}1 MeV is estimated to be (less-or-similar sign)4%. (c) 1999 The American Physical Society.

• OSTI ID: 20218018
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 60, Issue 6; Other Information: PBD: Dec 1999; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
NUCLEOSYNTHESIS
CROSS SECTIONS
PROTON-NEUTRON INTERACTIONS
COSMOLOGICAL MODELS
THEORETICAL DATA