Abstract
The knowledge of prompt fission $\ensuremath{\gamma}$-ray emission has been of major interest in reactor physics for a few years. Only few experimental spectra were published until now for fast-neutron-induced fission, and measurements would be also valuable in order to improve our understanding of the fission process. A simple experimental method was used to measure the first prompt fission $\ensuremath{\gamma}$-ray spectra up to 10 MeV. In this approach, the $\ensuremath{\gamma}$ rays are measured with a bismuth germanate (BGO) detector which offers two significant advantages with respect to other $\ensuremath{\gamma}$-ray detectors: a high peak-to-total ratio and a high efficiency. The prompt fission neutrons are rejected by the time-of-flight technique between the BGO detector and a fission trigger given by a fission chamber. Prompt fission $\ensuremath{\gamma}$-ray spectra were measured for 1.6 \ifmmode\pm\else\textpm\fi{} 0.1, 5.1 \ifmmode\pm\else\textpm\fi{} 0.2 and 15.0 \ifmmode\pm\else\textpm\fi{} 0.6 MeV neutron-induced fission on $^{238}\mathrm{U}$ at the CEA, DAM, DIF Van de Graaff accelerator; average multiplicity and mean photon energy per fission were deduced from the spectra.
Highlights
The knowledge of prompt fission γ -rays is important both for applications and for understanding the fission process
The γ -ray emission is the main source of the structures heating in nuclear reactors, and the prompt fission γ -rays is by far the less known
From a fundamental point of view, prompt γ -rays have to be measured in order to understand the angular momentum generation in the fission process [1]
Summary
The knowledge of prompt fission γ -rays is important both for applications and for understanding the fission process. From a fundamental point of view, prompt γ -rays have to be measured in order to understand the angular momentum generation in the fission process [1]. For a very long time only results on the total γ -ray energy was obtained in the fission of 235U, 237Np and 232Th for incoming neutron energies between 1 and 15 MeV [2], thanks to a Gd loaded neutron ball. It was measured relative to 252Cf spontaneous fission total γ -ray energy, together with the neutron multiplicity. In the first experiment organic liquid scintillator were used, limiting the maximum energy of the emitted γ -rays to 4 MeV. We report here measurements that were performed at the CEA/DIF 4 MV accelerator at neutron energies of 1.7, 5.2 and 15.6 MeV
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
