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The (n,xn) reactions play an important role in many nuclear applications like accelerator-driven systems, fast neutron reactors or nuclear medicine. Their experimental study is necessary to improve and validate simulation models especially between about 10 MeV and 200 MeV where the pre-equilibrium process becomes significant and data are scarce. A new experimental set-up has been built near the Tandem 7MV of Bruyères-le-Châtel (France) in order to perform new (n,xn) double-differential cross section measurements. It is composed of a 4π neutron detector and a low background neutron beam line. The detector, called CARMEN, is a tank containing 1 m of Gd-loaded liquid scintillator. It is intended to neutron multiplicity distributions measurements event by event with a very high efficiency (85% to fission neutrons). Due to its high sensitivity, CARMEN requires a well collimated neutron beam line as well as a low background. The neutrons are produced by nuclear reactions between proton or deuteron primary beams and tritium or deuterium targets surrounded by a heavy concrete shielding through which a channel was made defining the neutron beam. Neutron beams between 4 and 25 MeV are thus available. The entire set-up (detector and neutron production) and original experiments will be presented. The energy spectra of tagged (n,2n) reactions have been measured in the 8.3 13.3 MeV range on several targets. The results are compared with the predictions of the nuclear reaction code TALYS.

AN IMPROVED EXPERIMENTAL SET-UP FOR (N,XN) REACTIONS STUDIES