In the framework of the Neutronic and Nuclear Assessment Task Group of the MEGAPIE experiment we measured the delayed
neutron (DN) flux at the top of the target. The measurement was proposed mainly for radioprotection purposes since the
DN flux at the top of the target has been estimated to be of the same order of magnitude as the prompt neutron flux.
Given the strong model-dependence of DN predictions, the measurement of DN contribution to the total neutron activity
at the top of the target was thus desired. Moreover, this measurement is complementary to the DN experiments performed
at PNPI (Gatchina) on solid lead and bismuth targets. The DN measurement at MEGAPIE was performed during the start-up
phase of the target. In this paper we present a detailed description of the experimental setup and some preliminary results
on decay spectra. |
