Recent developments of the FALSTAFF experimental setup
Résumé
The study of nuclear fission is encountering renewed interest with the development
of GEN-IV reactor concepts, mostly working in the neutron fast energy domain.
To support the fast reactor technologies, new high quality nuclear data are needed. New
facilities are being constructed to produce high intensity neutron beams from hundreds of
keV to few tens of MeV (Licorne, NFS, nELBE, ...). They will open new opportunities to
provide nuclear data. In this framework the development of an experimental setup called
FALSTAFF for a characterisation of actinide fission fragments has been undertaken. Fission
fragment yields and associated neutron multiplicities will be measured as a function
of the neutron energy. Based on time-of-flight and residual energy technique, the setup
will allow the simultaneous measurement of the complementary fragment velocity and
energy. The FALSTAFF setup and the upgrade of the first arm prototype with the new
ionisation chamber CALIBER will be presented. The performances of the experimental
apparatus is discussed.