Absolute yield and time dependence of delayed neutron emission in 235U(n,f) and 239Pu(n,f)
There is currently a strong request, supported by IAEA/Coordinated Research Program, to provide new high quality data of delayed neutron (DN) yield and group constants for nuclear reactor and criticality/safety applications, as well as to validate fission models with calculations like FIFRELIN or GEF. In this proposal, the PF1B instrument is requested to deliver a collimated cold neutron beam to an active target in the form of a flat fission chamber. The latter is surrounded by a neutron detector consisting of a cylindrical PE block, with 16 He3 tubes. A fast beam stop system will be placed prior to this device, in order to drive repeated cycles of irradation and decay phases. The DN emission will be recorded as well the prompt neutron emission, in parallel with the monitoring of the fission events from the target. This experimental set-up is expected to provide better conditions for DN measurement at very short-time (~10 ms) compared to other reported experiments. This proposal is part of a PhD work by D. Foligno (2016-2019). A financial support was obtained by EDF and FRAMATOME, as well as from the NEEDS/NACRE collaborative program hosted by CNRS.
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LECONTE Pierre; BILLEBAUD Annick; DE IZARRA Gregoire; DORE Diane; FOLIGNO Daniela; GESLOT Benoit; KESSEDJIAN Gregoire; KOESTER Ulli; LECOLLEY François-René; LECOUEY Jean-Luc; LEDOUX Xavier; Marie; MATHIEU Ludovic; SEROT Olivier and SOLDNER Torsten. (2018). Absolute yield and time dependence of delayed neutron emission in 235U(n,f) and 239Pu(n,f). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-07-380
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