Elastic photon scattering from carbon and calcium and its interpretation

D. H. Wright, P. T. Debevec, L. J. Morford, and A. M. Nathan
Phys. Rev. C 32, 1174 – Published 1 October 1985
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Abstract

Differential cross sections for the elastic scattering of tagged, monochromatic photons have been measured for targets of carbon and calcium between 19 and 52 MeV. The formalism for the interpretation of these cross sections in terms of the total photoabsorption cross section and its partitioning into E1 and E2 parts is presented. For carbon, we find excellent agreement between the photoabsorption deduced from the scattering and previous direct measurements. The fore-to-aft asymmetries in the cross sections indicate that the bulk of E2 strength is above 50 MeV and not between 30 and 45 MeV, as previously thought. For calcium, the scattering data indicate that the integrated photoabsorption cross sections per nucleon are closer to the nearly constant value reported for A>100 than previously thought. No compact E2 strength exhausting more than 0.5 classical sums is found below 50 MeV, although weaker or less compact strength cannot be ruled out.

  • Received 12 February 1985

DOI:https://doi.org/10.1103/PhysRevC.32.1174

©1985 American Physical Society

Authors & Affiliations

D. H. Wright, P. T. Debevec, and L. J. Morford

  • Nuclear Physics Laboratory and Department of Physics, University of Illinois at Urbana-Champaign, Champaign, Illinois 61820

A. M. Nathan

  • University of Illinois at Urbana-Champaign, Champaign, Illinois 61820 and Département de Physique Nucléaire/MF, Centre d’Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette Cedex, France

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Vol. 32, Iss. 4 — October 1985

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