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Pion single and double charge exchange in the resonance region: Dynamical corrections

Journal Article · · Phys. Rev. C; (United States)
;
We consider pion-nucleus elastic scattering and single- and double-charge-exchange scattering to isobaric analog states near the (3,3) resonance within an isospin invariant framework. We extend previous theories by introducing terms into the optical potential U that are quadratic in density and consistent with isospin invariance of the strong interaction. We study the sensitivity of single and double charge exchange angular distributions to parameters of the second-order potential both numerically, by integrating the Klein-Gordon equation, and analytically, by using semiclassical approximations that explicate the dependence of the exact numerical results to the parameters of U. The magnitude and shape of double charge exchange angular distributions are more sensitive to the isotensor term in U than has been hitherto appreciated. An examination of recent experimental data shows that puzzles in the shape of the /sup 18/O(..pi../sup +/,..pi../sup -/)/sup 18/Ne angular distribution at 164 MeV and in the A dependence of the forward double charge exchange scattering on /sup 18/O, /sup 26/Mg, /sup 42/Ca, and /sup 48/Ca at the same energy may be resolved by adding an isotensor term in U.
Research Organization:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
OSTI ID:
6076024
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 27:4; ISSN PRVCA
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BASIC INTERACTIONS
CALCIUM 42 TARGET
CALCIUM 48 TARGET
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
DIFFERENTIAL EQUATIONS
DISTRIBUTION
ELASTIC SCATTERING
ENERGY LEVELS
EQUATIONS
HADRON REACTIONS
INTERACTIONS
ISOBARIC ANALOGS
ISOSPIN
KLEIN-GORDON EQUATION
MAGNESIUM 26 TARGET
MESON REACTIONS
NUCLEAR REACTIONS
OPTICAL MODELS
OXYGEN 18 TARGET
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE PROPERTIES
PION REACTIONS
RESONANCE
SCATTERING
SEMICLASSICAL APPROXIMATION
STRONG INTERACTIONS
TARGETS
WAVE EQUATIONS