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Positive pion-nucleus elastic scattering at 40 MeV

Journal Article · · Phys. Rev., C; (United States)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Differential cross sections for elastic scattering of 40 MeV positive pions from /sup 12/C, /sup 16/O, /sup 40/Ca, /sup 90/Zr, and /sup 208/Pb were measured at 18 angles in the angular range 25/sup 0/--160/sup 0/. Relative uncertainties of 2.5% to 7% and overall normalization uncertainties of 4% to 7% were obtained. An optical potential fit of the data indicates that while the magnitudes of the strength parameters, except for Re b/sub 1/, are different from values obtained from free ..pi..N scattering amplitudes, the variation of these magnitudes with target mass is roughly as predicted by the impulse approximation. Coulomb effects, especially in the cases of /sup 90/Zr and /sup 208/Pb, are extremely important, but impossible to unambiguously separate from the strong interaction in the optical model.
Research Organization:
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
OSTI ID:
5726551
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:5; ISSN PRVCA
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANGULAR DISTRIBUTION
CALCIUM 40 TARGET
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ENERGY RANGE
HADRON REACTIONS
IMPULSE APPROXIMATION
LEAD 208 TARGET
MEASURING INSTRUMENTS
MESON REACTIONS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
OPTICAL MODELS
OXYGEN 16 TARGET
PION PLUS REACTIONS
PION REACTIONS
PLASTIC SCINTILLATION DETECTORS
RADIATION DETECTORS
SCATTERING
SCATTERING AMPLITUDES
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
TARGETS
ZIRCONIUM 90 TARGET