Numéro
J. Phys. Colloques
Volume 51, Numéro C6, Novembre 1990
7th International Conference on Polarization Phenomena in Nuclear Physics
Page(s) C6-603 - C6-606
DOI https://doi.org/10.1051/jphyscol:1990683
7th International Conference on Polarization Phenomena in Nuclear Physics

J. Phys. Colloques 51 (1990) C6-603-C6-606

DOI: 10.1051/jphyscol:1990683

OFF-SHELL EFFECTS OF NUCLEON-NUCLEON POTENTIAL MODELS ON PROTON-NUCLEUS ELASTIC SCATTERING OBSERVABLES

H.F. ARELLANO1, W.G. LOVE1, K. NAKAYAMA1 and F.A. BRIEVA2

1  Department of Physics and Astronomy, The University of Georgia Athens, Georgia 30602, U. S. A.
2  Departamento de Fisica, Facultad de Ciencias Fisica y Matematicas, Universidad de Chile, Casilla 487-3, Santiago, Chile


Résumé
Les observables de spin et la section efficace de diffusion élastique p+40Ca sont calculées dans un modèle de convolution complète utilisant les matrices t de l'interaction NN libre basées sur les potentiels de Paris et de Bonn. Les deux familles de calculs sont comparées entre elles et aux données à 200 MeV ainsi qu'au modèle t.rho plus conventionnel. Les calculs en convolution complète reproduisent beaucoup mieux les données et montrent qu'à cette énergie un bon traitement des effets hors couche est plus important que le choix entre les deux potentiels NN considérés.


Abstract
Spin observables and cross sections are calculated for p+40Ca elastic scattering in a full-folding model using nucleon-nucleon (NN) free t-matrices based on the Paris and Bonn (OBE) potentials. The two sets of calculated observables are compared with each other, with conventional tρ results and with data at 200 MeV. The differences between full-folding and tρ results are striking, with the full-folding results being in much better agreement with the data. At this energy the choice between the two NN potentials considered is found to be less critical than a proper treatment of off-shell effects as prescribed by the full-folding model.



© EDP Sciences 1990