Pion production on nuclei near threshold

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:387164

Lee, T S.H. ^[1]

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1. Argonne National Laboratory, IL (United States)

By direct extension of Weinberg`s effective pion-nucleon chiral Lagrangian to nuclei, the nuclear S-wave pion production operator is described by the axial charge density operator. It is shown that the short-range axial exchange charge operator implied by the nucleon-nucleon interaction enhances the predicted cross section for the reaction pp {r_arrow} pp{pi}{sup 0} near threshold by factors 3-5. This suffices to explain most of the under-prediction obtained with the single nucleon operator and S-wave pion rescattering. The result implies that the cross section for pp {r_arrow} pp{pi}{sup 0} can provide direct information on the short range components of the nucleon-nucleon interaction. The approach has been extended to derive the three-nucleon absorption mechanism from the existing models of three-nucleon forces. The results of pion absorption on {sup 3}He will be presented.

• OSTI ID: 387164
• Report Number(s): CONF-931044--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
HELIUM 3
PARTICLE PRODUCTION
PION REACTIONS
PIONS
PROTON-PROTON INTERACTIONS