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Nonstatic theory of pion-nucleus scattering

Journal Article · · Ann. Phys. (N.Y.); (United States)

A multiple scattering description of ..pi..-nucleus scattering that does not make use of the standard fixed-scatterer approximation (FSA) is presented. A generalized version of the impulse approximation is derived. This is then used to obtain an improved first order optical potential, which is studied for pion energies around the 3-3 resonance. One of the most important features of the nonstatic description is to take into account the intermediate propagation of the interacting ..pi..-N system (..delta..). This propagation induces a nonlocality in the optical potential. Its effect is studied for pion propagation in nuclear matter, which is found to be dominated by two collective modes of the ..pi..-nucleus system. The static description represents a well-defined limit of our formalism that allows the determination of the range of validity of the FSA. Binding corrections to the elementary amplitude are investigated and it is established that they represent, within the nonstatic formalism, the ..delta..-residual nucleus interaction. Their influence on ..pi..-nucleus scattering is discussed. Pion absorption is shown to be inherently contained in the nonstatic description of ..pi..-nucleus scattering. (AIP)

Research Organization:
Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts
OSTI ID:
7354573
Journal Information:
Ann. Phys. (N.Y.); (United States), Journal Name: Ann. Phys. (N.Y.); (United States) Vol. 95:2; ISSN APNYA
Country of Publication:
United States
Language:
English

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Related Subjects

645205* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. = 0-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARGED-PARTICLE REACTIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
IMPULSE APPROXIMATION
INTERACTIONS
INTERMEDIATE RESONANCE
MESON REACTIONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MULTIPLE SCATTERING
NUCLEAR REACTIONS
OPTICAL MODELS
PARTICLE INTERACTIONS
PION REACTIONS
PION-NUCLEON INTERACTIONS
RESONANCE
SCATTERING