Microscopic approach to pion-nucleus dynamics

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.R9· OSTI ID:7119045

Chen, C M; Ernst, D J ^[1]; Johnson, M B ^[2]

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1. Center for Theoretical Physics and Physics Department, Texas A M University, College Station, Texas 77843 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Elastic scattering of pions from finite nuclei is investigated utilizing a contemporary, momentum-space first-order optical potential combined with microscopic estimates of second-order corrections. The calculation of the first-order potential includes (1) full Fermi-averaging integration including the [Delta] propagation and the intrinsic nonlocalities in the [pi]-[ital N] amplitude, (2) covariant kinematics, (3) invariant amplitudes, and (4) a finite-range off-shell pion-nucleon model which contains the nucleon-pole term. The [Delta] nucleus interaction is included via the mean spectral-energy approximation. This approach produces a convergent perturbation theory in which the Pauli corrections (treated as a second-order term) cancel remarkably against the pion true-absorption terms. Parameter-free results, including the [Delta]-nucleus shell-model potential, Pauli corrections, pion true absorption, and short-range correlations, are presented.

• OSTI ID: 7119045
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:1; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663460* -- Meson- & Hyperon-induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
CHARGED-PARTICLE REACTIONS
DELTA BARYONS
ELASTIC SCATTERING
ELEMENTARY PARTICLES
FERMIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MESON REACTIONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
N BARYONS
NUCLEAR MODELS
NUCLEAR REACTIONS
OPTICAL MODELS
PARTICLE INTERACTIONS
PERTURBATION THEORY
PION REACTIONS
PION-NUCLEON INTERACTIONS
SCATTERING
SHELL MODELS