Elsevier

Nuclear Physics A

Volume 506, Issue 2, 8 January 1990, Pages 307-331
Nuclear Physics A

Nuclear photon scattering by 12C

https://doi.org/10.1016/0375-9474(90)90389-4Get rights and content

Abstract

Cross sections for photon scattering by the 12C nucleus have been measured in the energy range from 15 to 140 MeV. Quasimonochromatic tagged photons allowed the separation of elastic and inelastic processes. An additional measurement with continuous bremsstrahlung improved the accuracy of the elastic part of the cross section considerably. In analyzing the bremsstrahlung runs, the inelastic components were taken from the tagged photon results and from literature. The cross sections were analyzed in terms of giant resonances, proton-neutron substructures and subnuclear excitations. Form factors for charge and exchange current were applied to take into account the finite nucleon and exchange-current distribution in 12C. For the E2 resonance, a coupled-channel model was used, which is applicable to an isolated resonance superimposed on a continuum. The average sum of the static electric and magnetic polarizabilities of bound nucléons was found to be in agreement with the value of the free proton.

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    This work was supported by the Deutsche Forschungsgemeinschaft, SFB 201.

    1

    Present address: Lurgi AG, 6000 Frankfurt/M., Fed. Rep. Germany.

    2

    Present address: Gei GmbH, Elisabethenstr. 44 1/2, 6100 Darmstadt, Fed. Rep. Germany.

    3

    Present address: Bosch AG, 3200 Hildesheim, Fed. Rep. Germany.

    4

    Present address: Siemens AG, 8000 München 83, Fed. Rep. Germany.

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