Abstract
Experimental activities at JRC-Geel on prompt fission neutron (PFN) emission in response to OECD/NEA nuclear data requests are presented in this contribution. Specifically, on-going investigations of PFN emission from the reaction 235U(n,f) in the region of the resolved resonances, taking place at the GELINA facility, are presented. The focus of this contribution lies on studies of PFN correlations with fission fragment properties. The experiment employs a scintillation detector array for neutron detection, while fission fragment properties are determined via the double kinetic energy technique using a position sensitive twin ionization chamber. This setup allows us to study several correlations between properties of neutron and fission fragments simultaneously. Results on PFN correlations with fission fragment properties from the present study differ significantly from earlier studies on this reaction, induced by thermal neutrons.
Highlights
Experimental investigations of prompt fission neutrons and fission fragment properties in resonance neutron induced fission on 235U are taking place at the GELINA facility of the JRC-Geel
Improved knowledge of the properties of prompt fission neutrons (PFN), their multiplicities, as well as their energy and angular distributions are of interest for questions related to the neutron emission itself, and to questions relevant to the formation of the fission fragments, the sharing of excitation energy among them and the time scale of the process
The fission fragment mass and kinetic energy before neutron emission is obtained by means of the well-established double kinetic energy (2E) technique, which relates the masses m∗1,2 and energies E1∗,2 before neutron emission in a binary fission event according to m∗1,2
Summary
Experimental investigations of prompt fission neutrons and fission fragment properties in resonance neutron induced fission on 235U are taking place at the GELINA facility of the JRC-Geel. Improved knowledge of the properties of prompt fission neutrons (PFN), their multiplicities, as well as their energy and angular distributions are of interest for questions related to the neutron emission itself, and to questions relevant to the formation of the fission fragments, the sharing of excitation energy among them and the time scale of the process. [3] possible deficiencies in the experimental data were pointed out. For these reasons it is interesting to revisit PFN and fragment correlations in 235U(n,f) experimentally
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