Nucleon-nucleon Bremsstrahlung: off-energy-shell effects and meson-exchange currents

Conference · Tue Dec 10 00:00:00 EST 1991 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:7105840

Brown, V R ^[1]

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1. Lawrence Livermore National Lab, Box 808 Livermore, California 94550 (United States)

Nucleon-nucleon bremsstrahlung, NN{gamma}, is fundamental process, which involves the strong and electromagnetic fields acting simultaneously. Since the electromagnetic interaction is well known, NN{gamma} provides a calculable tool for comparing off-energy-shell (OES) effects from different two-nucleon potentials compared to experiment and also provides a simple testing ground, which is sensitive to meson-exchange-current (MEC) contributions that are so important in electronuclear physics. MEC effects, which are included by requiring gauge invariance of the complete np{gamma} amplitude and which increase the cross section by a factor greater than two, are shown to order K{degree} in the photon momentum at 200 MeV. pp{gamma} calculations are compared to the 280 MeV experimental results from TRIUMF, which use a polarized proton beam, and which contain large'' OES effects. Potentials with different short-range radial behavior are compared in order to examine the penetration of the photon radiation. Rather good agreement with experiment for the Bonn potential is achieved without the arbitrary normalization of 2/3 applied to the TRIUMF cross-section data. The rescattering included in our work accounts for an increase of up to approximately 20% in the cross section, and it contributes up to a factor of 2.5 in the analyzing power.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7105840
• Report Number(s): CONF-9101100-; CODEN: APCPC; TRN: 92-027509
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (United States), Vol. 242:1; Conference: Workshop on strong, weak, and electromagnetic interactions in nuclei, atoms, and astrophysics, Livermore, CA (United States), 3-4 Jan 1991; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEON-NUCLEON INTERACTIONS
BREMSSTRAHLUNG
ANALYZING POWER
DIFFERENTIAL CROSS SECTIONS
ELECTROMAGNETIC FIELDS
MEV RANGE 100-1000
POTENTIALS
RESCATTERING
BARYON-BARYON INTERACTIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ENERGY RANGE
HADRON-HADRON INTERACTIONS
INTERACTIONS
MEV RANGE
PARTICLE INTERACTIONS
RADIATIONS
SCATTERING
663430* - Nucleon-Induced Reactions & Scattering- (1992-)