Integral experiment of photonuclear cross sections of C, Mn, Fe, In and Au in the giant resonance region

Abstract

The integral experiment for a sensitivity check of photonuclear cross section data of C, Mn, Fe, In and Au was performed by using the bremsstrahlung produced in a thick iron target by 18, 22, 26 and 30 MeV electrons from a linear accelerator. The cross section data measured by the activation method showed better results for all incident electron energies than those by the photoneutron method, because the latter include the competing (γ, np) reaction above its threshold energy. It is necessary to obtain the cross section data of (γ, n), (γ, np), (γ, 2n), (γ, p2n) reactions etc., separately by the activation method. The effective energy range and effective cross section in the giant resonance region were determined for C, Mn, Fe and Au. By using these quantities, the gross structure of the bremsstrahlung spectrum was obtained in good agreement with the theoretical calculation.