The new pulsed mono-energetic neutron source at the IRMM and the shape isomer search in U-239

摘要

In the frame of the exploratory research initiative of the JRC a new pulsing device has been installed at the Van-de-Graaff of the IRMM to produce pulsed quasi mono-energetic neutron beams in the MeV range. The pulse width may be tuned from 10 mu s up to several hundreds of mu s with a repetition rate between I Hz and 5 kHz. The aim of the device is to study the decay of short-lived activation products between pulses in an essentially neutron-free environment. In a first application the shape isomer in U-239 was searched.