Abstract
Investigations of prompt emission in fission is of importance in understanding the fission process in general and the sharing of excitation energy among the fission fragments in particular. Experimental activities at IRMM on prompt neutron emission from fission in response to OECD/NEA nuclear data requests is presented in this contribution. Main focus lies on currently on-going investigations of prompt neutron emission from the reaction 235 U(n,f) in the region of the resolved resonances. For this reaction strong fluctuations of fission fragment mass distributions and mean total kinetic energy have been observed [Nucl. Phys. A 491, 56 (1989)] as a function of incident neutron energy in the resonance region. In addition fluctuations of prompt neutron multiplicities were also observed [Phys. Rev. C 13, 195 (1976)]. The goal of the present study is to verify the current knowledge of prompt neutron multiplicity fluctuations and to study correlations with fission fragment properties.
Highlights
IntroductionKnowledge of the properties of prompt fission neutrons, their multiplicities and energy distributions could give answers to 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
Prompt neutron emission in fission is of particular importance in understanding the fission process.Knowledge of the properties of prompt fission neutrons, their multiplicities and energy distributions could give answers to 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
For nuclear modeling and improved evaluation of nuclear data the knowledge about fluctuations in the prompt neutron multiplicity as a function of incident neutron energy is requested for the major actinides 235 U and 239 Pu [1, 2]
Summary
Knowledge of the properties of prompt fission neutrons, their multiplicities and energy distributions could give answers to 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. In view of the fact that both neutron number and fission fragment properties have been found to vary it is necessary to study the correlations of prompt neutron multiplicity and fission fragments properties in the resonance region. Experimental investigations of the correlations of prompt fission neutron multiplicity with fragment properties in resonance neutron induced fission on 235 U and 239 Pu, are taking place at the GELINA facility of the JRC-IRMM
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