Systematic study of the de-excitation of neutron-rich nuclei produced in different fission reactions

Open Access

15 December 2021

journal article
research article
Published by EDP Sciences in EPJ Web of Conferences

Vol. 256, 00012
https://doi.org/10.1051/epjconf/202125600012

Abstract

In this paper we present results from two recent studies, both related to the emission of prompt fission γ rays. Firstly, we have analyzed data from the reaction 235U(n, f) induced by fast neutrons of average energy = 1.7 MeV. The deduced spectral characteristics are an average multiplicity = 7.11 ± 0.44 γ rays per fission and an average total γ-ray energy release in fission = 5.51 ± 0.46 MeV, corresponding to an average γ-ray energy = 0.77 ± 0.08 MeV. Secondly, we have addressed – and answered – the question how those characteristics in general depend on the width of the chosen prompt time window and the timing resolution, determined by the employed detectors and electronics. The conclusion is that once this is known, it is possible to compare results from different experiments in a more meaningful way.

Keywords

This publication has 16 references indexed in Scilit:

Prompt-fission $γ$ -ray spectral characteristics from ${}^{239}{Pu} (n_{th}, f)$
Physical Review C, 2017
Late-time emission of prompt fission $γ$ rays
Physical Review C, 2016
Prompt fission $γ$ -ray spectrum characteristics from ${}^{240}{Pu} (sf)$ and ${}^{242}{Pu} (sf)$
Physical Review C, 2016
Comparative measurement of prompt fission $γ$ -ray emission from fast-neutron-induced fission of ${}^{235}U$ and ${}^{238}U$
Physical Review C, 2015
Impact of low-energy photons on the characteristics of prompt fission $γ$ -ray spectra
Physical Review C, 2015
High-precision prompt- $γ$ -ray spectral data from the reaction ${}^{241}{Pu}$ ( $n_{th}$ , $f$ )
Physical Review C, 2014
Development of a kinematically focused neutron source with the p(7Li,n)7Be inverse reaction
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2014
Improved values for the characteristics of prompt-fission $γ$ -ray spectra from the reaction $^{235}$ U( $n_{th}$ , $f$ )
Physical Review C, 2013
New prompt spectral $γ$ -ray data from the reaction $^{252}$ Cf(sf) and its implication on present evaluated nuclear data files
Physical Review C, 2013
Identification of prompt fission $γ - rays$ with lanthanum-chloride scintillation detectors
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2012