Kernphotoprozesse im Sauerstoff und ihre Bedeutung f�r die Kontrolle der Energie und des Photonenspektrums an Elektronenbeschleunigern

Abstract

The yields of the photonuclear reactions16O(γ,n) and16O(γ, 2n) are measured with a newly constructed device for fluid samples. The well known structures of the (γ,n) cross section are used for the energy calibration of our accelerator. Though the yield should be strongly dependent on small changes of the bremsspectrum no difference was found, using a thin or a thick target. The conclusion is, that also the thick target is in its effect a thin target under the accelerator conditions. The (γ, 2n) cross section is measured for the first time between threshold and 120 MeV. It is unusually small compared to the (γ,n) cross section.