Abstract
Differential cross sections for elastic scattering have been measured at lab energies of 18.00, 21.12, 24.11, 25.50, 26.99, 28.50, and 29.50 MeV. The majority of the data have relative errors less than 1%, and the additional error in absolute scale is 0.30%. A phase-shift analysis of the data has been performed, and most of the phase shifts have been determined to within . These phase shifts and others from the literature were used to study properties of the system in the center of mass energy range 1.50 to 14.74 MeV. First, an -matrix analysis was made of the phase shifts; this analysis yields a resonance energy of 11.7 ± 0.4 MeV and a level width at resonance of 4.0 ± 0.4 MeV. Second, comparison was made of the phase shifts with results of previous resonating-group calculations, and this comparison shows good agreement with a calculation which includes one inelastic channel and a nucleon-nucleon repulsive core. Third, an potential model was constructed. This model contains an attractive potential obtained by folding Gaussian -particle densities together with a Yukawa-shaped direct part of a nucleon-nucleon potential and, in addition, contains phenomenological short-range repulsive components in the and states. The model reproduces the experimental phase shifts quite well when the Yukawa potential is taken to have a range corresponding to a two-pion mass.
NUCLEAR REACTIONS , MeV; measured ; deduced phase shifts . -matrix analysis . Comparison with resonating-group calculations. Potential-model analysis.
- Received 12 August 1974
DOI:https://doi.org/10.1103/PhysRevC.10.1767
©1974 American Physical Society