Total photonuclear absorption cross section for Pb and for heavy nuclei in the Δ-resonance region |
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Authors: | P Carlos H Beil R Bergére J Fagot A Leprêtre A De miniac A Veyssiére |
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Institution: | Service de Physique Nucléaire-Métrologie Fondamentale, CEN Saclay, 91191 Gif-sur-Yvette Cédex, France |
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Abstract: | The partial sum σ(2)(Eγ) = Σi?2 σ(γ, in…), representing the inclusive cross section for all reaction channels in which at least two neutrons are emitted, has been measured with a quasimonochromatic photon beam obtained by the in-flight annihilation of monoenergetic positrons, and neutron multiplicity counting. These experimental results, taken with photon energies Eγ from 145 up to 440 MeV for Pb and with photon energies Eγ= 235 MeV and 330 MeV for Al, Cu, Zr, Sn, Ho, Ta and U, are subsequently used to determine the total photonuclear absorption cross section σ(tot: Eγ) and to study the dependence upon the mass number A of the normalized cross section σ(tot: Eγ)/A. These results are then compared with other information on the total photonuclear absorption cross section. |
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Keywords: | Nuclear reactions |
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