Abstract
Improved knowledge of prompt emission in fission has significant implications for our understanding of the fission process. It is also important for improving nuclear data evaluation, with impact on applications. The correlation between prompt neutrons and fragments emitted in binary neutron induced fission of $^{235}\mathrm{U}$ has been studied at the GELINA facility. The experiment employs an array of proton recoil scintillators and a position-sensitive twin ionization chamber. This experimental arrangement permits measurement of the correlations between neutron emission, fragment angle, and mass and energy of the fission fragments. In this article, we present results on prompt fission neutron energy and multiplicity correlations with mass and total kinetic energy of the fission fragments. Results from the present measurement shows distinct differences compared to earlier studies of the correlated fission fragment and prompt neutron emission quantities. The differences with respect to earlier investigations are interpreted as improved fission fragment energy resolution in the present measurement. The present result supports several recent model calculations of prompt neutron and fission fragment correlations.
Highlights
In fission, primary fragments release excitation energy by the emission of neutrons and γ rays
We present results on prompt fission neutrons (PFN) correlations with fission fragments extracted from the data by summing over the incident neutron energy range [0.26 eV, 45 keV]
A correlation measurement of fission fragments and prompt neutrons emitted in neutron induced fission of 235U was carried out
Summary
Primary fragments release excitation energy by the emission of neutrons and γ rays. Improved knowledge of the properties of the prompt fission neutrons (PFN), their multiplicities, as well as their energy and angular distributions can shed light on the fission process near the scission point. One of the major driving forces behind these efforts is to develop tools for improved evaluations of nuclear data on prompt fission neutron spectra (PFNS), in neutron-induced fission [8]. A second major driving force has been to develop realistic correlated fission neutron sources, in terms of energy and angular distributions, for Monte Carlo transport codes. This has strong impact on, for example, nonproliferation and nuclear safeguards applications [9]. We present results on PFN correlations with fission fragments extracted from the data by summing over the incident neutron energy range [0.26 eV, 45 keV]
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