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AbstractAbstract
[en] Experimental results of pion-nucleon elastic scattering below 1.6 GeV (total cross sections, angular distributions of elastic scattering and recoil nucleon polarizations) have been described by a partial wave analysis. This analysis has been developed, one energy at a time, with a method of least squares fits. A single solution is extracted by continuity with energy of the different solutions. Resonating behaviour has been clearly established for several partial waves. In addition to these important effects some phase shifts show rapid variations with energy. Present experimental situation does not permit to say whether these variations are due to experimental biases or to physical effects. (author)
[fr]
Les resultats experimentaux de la diffusion elastique meson π - nucleon au-dessous de 1.6 GeV (sections efficaces totales, distributions angulaires de diffusion elastique et de polarisation du nucleon de recul) sont decrits a l'aide d'une analyse en ondes partielles. Cette analyse est developpee energie par energie au moyen d'une methode d'ajustement en moindres carres. Un critere empirique de continuite des solutions en fonction de l'energie a permis d'isoler une solution unique. Des resonances sont clairement etablies pour plusieurs ondes partielles, ainsi que certains petits effets moins caracteristiques. Pour ceux-ci, la situation experimentale presente ne permet pas d'affirmer s'ils sont dus a des effets physiques ou a des biais experimentaux. (auteur)Original Title
Analyse en ondes partielles de la diffusion elastique meson π - nucleon au-dessous de 1.6 GeV
Primary Subject
Secondary Subject
Source
1969; Jun 1968; [83 p.]; 85 refs.; These docteur es sciences
Record Type
Report
Literature Type
Thesis/Dissertation
Report Number
Country of publication
ANGULAR DISTRIBUTION, BARYONS, BREIT-WIGNER FORMULA, CHARGE EXCHANGE, DISPERSION RELATIONS, ELASTIC SCATTERING, GEV RANGE 01-10, INTERLABORATORY COMPARISONS, ISOSPIN, LEAST SQUARE FIT, LEGENDRE POLYNOMIALS, MEV RANGE 100-1000, MINIMIZATION, MULTI-PARAMETER ANALYSIS, PARTIAL WAVES, PHASE SHIFT, PION-NUCLEON INTERACTIONS, POLARIZATION, QUASI-ELASTIC SCATTERING, SINGULARITY, TOTAL CROSS SECTIONS
CROSS SECTIONS, DIRECT REACTIONS, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FUNCTIONS, GEV RANGE, HADRON-HADRON INTERACTIONS, HADRONS, INTERACTIONS, MATHEMATICAL SOLUTIONS, MAXIMUM-LIKELIHOOD FIT, MESON-BARYON INTERACTIONS, MESON-NUCLEON INTERACTIONS, MEV RANGE, NUCLEAR REACTIONS, NUMERICAL SOLUTION, OPTIMIZATION, PARTICLE INTERACTIONS, PARTICLE PROPERTIES, POLYNOMIALS, QUASI-FREE REACTIONS, SCATTERING
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