Nuclear photon scattering by 208 Pb
198836 pages
Published in:
- Nucl.Phys.A 489 (1988) 189-224
- Published: 1988
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Abstract: (Elsevier)
Photon-scattering cross sections covering the energy range from 10 MeV to 100 MeV have been measured using monochromatic photons and bremsstrahlung. A comparison of both sets of data shows relatively small inelastic contributions, in addition to the elastic processes. The elastic processes yield parameters for the giant dipole, and the isovector giant quadrupole resonances. The partition of the total absorption cross section for 208 Pb into these resonances, as well as into the quasideuteron, and the mesonic absorption is deduced. To identify fully the multipolarities in the Δ-resonance region, the measurements must be extended to higher photon energies. From the scattering cross section at 60 MeV to 100 MeV photon energy, a value for the sum of the static electric and magnetic polarizabilities of an average bound nucleon has been deduced which is slightly larger than the presently accepted experimental value for the free proton. Using the classical form factor picture for a description of the effects of spatial extent, form factors could be deduced for the normal and the exchange part of the interacting electromagnetic current.- NUCLEAR REACTIONS
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