We measured integral thin target cross sections for the proton-induced production
of He-, Ne-, Ar-, Kr- and Xe-isotopes from lead and bismuth from the respective
reaction threshold up to 2.6 GeV. The production of noble gas isotopes from lead
and bismuth is of special importance for design studies of accelerator driven nuclear
reactors and/or energy ampli ers. The phenomenology of the determined excitation
functions enables us to distinguish between the di erent reaction modes fragmentation,
hot and cold symmetric ssion, asymmetric ssion and deep spallation. The
experimental data are compared to results from the theoretical nuclear model code
INCL4/ABLA. This comparison clearly indicates that experimental data are still
needed because the predictive power of nuclear model codes, though permanently
improving, does still not allow to reliably predict the cross sections needed for most
applications and irradiation experiments remain indispensable. |
