Tests of ionisation chambers for photofission experiments

Photofission in the barrier region suffers from relatively low cross sections. Hence, besides using intense Bremsstrahlung (S-DALINAC) or monochromatic gamma ray beams (ELI-NP), significant amounts of target material needs to be placed in the beam to reach sufficient luminosity. We set up and tested a multi-stack Frisch-grid ionisation chamber and obtained angular and mass distributions as well as total kinetic energy of fission fragments in neutron-induced fission of ²³²Th and ²³⁸U. For the measurement of the azimuthal angular distribution segmented anodes have been used. This document is made up of an abstract and a poster. (authors)