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Proton elastic scattering on light nuclei. I. Energy dependence

E. Fabrici, S. Micheletti, M. Pignanelli, and F. G. Resmini

R. De Leo, G. D'Erasmo, and A. Pantaleo

J. L. Escudié and A. Tarrats

  • Istituto di Fisica dell'Università di Milano and Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Milano, Italy

  • Istituto di Fisica dell'Università di Bari and Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Bari, Italy

  • Départment de Physique Nucléaire, CEN Saclay, BP 2, 91190 Gif-sur-Yvette, France

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Phys. Rev. C 21, 830 – Published 1 March, 1980

DOI: https://doi.org/10.1103/PhysRevC.21.830

Abstract

Differential cross sections for proton elastic scattering by N15, O18, Mg24, and Ar40 were measured at several proton energies between 14 and 44 MeV. Previous data on C12, O16, Mg24, Si28, and Ca40 have also been considered. Evidence has been found for a strong enhancement in proton emission at backward angles for scattering by spherical nuclei at incident energies higher than 26 MeV. A phase-shift analysis of all the differential cross sections showed that the partial waves involved are those near grazing. Optical-model fits of good quality have been obtained for collective nuclei, while for spherical nuclei the cross sections at backward angles are not reproduced. The disagreement is not substantially modified when nonstandard radial dependences are given to the optical potential.

NUCLEAR REACTIONS Proton elastic scattering on N15, Ep=18.1−44.2 MeV; O18, Ep=14.7−44.1 MeV; Mg24, Ep=35.2−44.1 MeV; Ar40, Ep=20.9−44.1 MeV. Measured σ(ϑ). Comparison with phase-shift and optical-model analysis. Deduced optical-model potentials.

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See Also

Proton elastic scattering on light nuclei. II. Nuclear structure effects

E. Fabrici, S. Micheletti, M. Pignanelli, F. G. Resmini, R. De Leo, G. D'Erasmo, and A. Pantaleo
Phys. Rev. C 21, 844 (1980)

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Phys. Rev. C 21, 830– Published 1 March, 1980
  • Received 22 June 1979

© 1980 American Physical Society

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