Prompt emission in fission induced with fast neutrons
Paper i proceeding, 2015

Prompt gamma-ray and neutron emission data in fission integrates a large amount of information on the fission process and can shed light on the partition of energy. Measured emission spectra, average energies and multiplicities also provide important information for energy applications. While current reactors mostly use thermal neutron spectra, the future reactors of Generation IV will use fast neutron spectra for which little experimental prompt emission data exist. Initial investigations on prompt emission in fast neutron induced fission have recently been carried out at the LICORNE facility at the IPN Orsay, which exploits inverse reactions to produce naturally collimated, intense beams of neutrons. We report on first results with LICORNE to measure prompt fission gamma-ray spectra, average energies and multiplicities for U-235 and U-238. Current improvements and upgrades being carried out on the LICORNE facility will also be described, including the development of a H-2 gas target to reduce parasitic backgrounds and increase intensities, and the deployment of B-11 beams to extend the effective LICORNE neutron energy range up to 12 MeV. Prospects for future experimental studies of prompt gamma-ray and neutron emission in fast neutron induced fission will be presented.

prompt fission gamma rays

inverse kinematics



directional neutron beam

fast-neutron induced fission




J. Wilson

Institut de Physique Nucleaire Orsay

M. Lebois

Institut de Physique Nucleaire Orsay

P. Halipré

Institut de Physique Nucleaire Orsay

S. Oberstedt

European Commission Joint Research Centre, Institute for Reference Materials and Measurements

Andreas Oberstedt

Chalmers, Fundamental fysik

Physics Procedia

18753884 (ISSN) 18753892 (eISSN)

Vol. 64 107-113


Subatomär fysik