Neutron Production in Thick Targets Irradiated with High-Energy Ions
Figure 5
The original “two Cu disk experiments” in Berkeley showing the first evidence for unresolved problems [1, 2] in irradiations with 72 GeV 40Ar at the Bevalac accelerator (LBNL) after 1980. The original “two Cu disks” experiments were carried out from 1980 with relativistic 40Ar-ions at the Bevalac in Berkeley. (a) Schematic representation of the target set-up using two Cu disks and a surrounding guard ring around the second disk. Two configurations were irradiated: (i) (top): 0 cm distance between the disks (), (ii) (bottom): 20 cm distance between the disks (). (b) Autoradiographic negative picture of a Cu disk after an irradiation with 72 GeV 40Ar showing the well-focussed Ar beam in the centre. (c) Schematic representation of 3 different reaction paths. The path Ar-3 is of particular importance for the study of effects due to secondary fragments.
