Scattering of 139-MeV Alpha Particles by Ni58 and Pb208

D. A. Goldberg, S. M. Smith, H. G. Pugh, P. G. Roos, and N. S. Wall
Phys. Rev. C 7, 1938 – Published 1 May 1973
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Abstract

The elastic and inelastic scattering of α particles by Ni58 and Pb208 has been investigated at an incident energy of 139 MeV. The elastic cross sections have been analyzed in terms of the optical model using a six-parameter Woods-Saxon potential. The data for Ni58 are sufficient to eliminate the discrete ambiguity in the strength of the potential; the single potential which fits the data has a well depth of 116 MeV and a volume integral J4A of 298 MeV fm3. For Pb208 the discrete ambiguity could not be resolved. This outcome is consistent with recently developed criteria for experimental data necessary to resolve the discrete ambiguity. A discussion of the discrete ambiguity, in particular the A dependence, is given, and it is shown that measurements at higher energies are required to resolve the ambiguity for Pb208. The inelastic cross sections for transitions to the 1.45-MeV (Jπ=2+), 2.46-MeV (4+), 4.47-MeV (3) states in Ni58 and the 2.62-MeV (3) state in Pb208 have been analyzed with distorted-wave Born-approximation (DWBA) calculations using collective-model form factors. The results are consistent with previous analyses of lower-energy data.

  • Received 18 December 1972

DOI:https://doi.org/10.1103/PhysRevC.7.1938

©1973 American Physical Society

Authors & Affiliations

D. A. Goldberg, S. M. Smith, H. G. Pugh, P. G. Roos, and N. S. Wall

  • Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742

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Vol. 7, Iss. 5 — May 1973

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