Abstract
Partial photoneutron cross sections σ γ, n , σ γ, 2 n , σ γ, 3 n and σ γ·4 n of 208Pb and 197 Au were measured using a monochromatic photon beam and a neutron detecting system capable of analysing directly and simultaneously interactions of the type ( y, xn) in the photon energy range 6 MeV ≦ E ≦ 35 MeV. Nuclear information extracted from these data includes threshold values, integrated cross sections and giant dipole resonance parameters obtained by means of Lorentz line fitting. A tentative analysis of the structure observed on the rising shoulder of the giant resonance of 208Pb is presented. The level density parameters a as well as the non-statistical neutron contributions obtained from a study of the competition between the (γ, n) and (γ, 2n) decay modes, are also given.
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