Role of rho/sup 2/ term in pion-nucleus dynamics
We study the corrections to the first-order optical potential in ..pi..-nucleus elastic scattering from 28 to 260 MeV. The dynamical effects of true pion absorption (and correlations) are incorporated into our analysis through the inclusion of a second-order optical potential. We have performed a chi/sup 2/ fit to the measured ..pi..-/sup 4/He and ..pi..-/sup 1/2C elastic differential cross sections in order to determine a parametrization of the second-order optical potential. It is shown that the inclusion of these higher-order effects not only yields excellent fits to the low-energy data (< 50 MeV), but also systematically improves calculated cross sections at the larger angles in the resonance region. We also find a general improvement in the agreement between the calculated and measured total cross sections, in particular at low energies. Since our first-order potential is essentially parameter free, we believe that the parameters of the second-order potential determined from the present work are meaningful and may serve as a useful guid in future microscopic analyses.
- Research Organization:
- Institute of Nuclear Theory and Department of Physics, Brooklyn College of the City University of New York, Brooklyn, New York 11210
- OSTI ID:
- 6877964
- Journal Information:
- Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 17:5; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ENERGY RANGE
HADRON REACTIONS
HELIUM 4 TARGET
MESON REACTIONS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR REACTIONS
OPTICAL MODELS
PION REACTIONS
SCATTERING
TARGETS
TOTAL CROSS SECTIONS