Abstract
Experiments to perform precision spectroscopy of fast neutron induced fission were carried out during the ν-Ball experimental campaign at the ALTO facility of IJC Laboratory Orsay. Low energy fission of 232Th(n,f), 238U(n,f) and spontaneous fission of 252Cf were studied using this hybrid highresolution spectrometer and calorimeter. New observables such as γ-ray multiplicity distributions correlated with specific fission fragments are presented and discussed. A new method using fast-timing techniques to detect prompt fission neutrons in coincidence with prompt fission γ-rays is described.
Highlights
The ⌫-Ball experimental campaign was carried out in 2018 at the ALTO facility of the IJC Laboratory in Orsay
Prompt γ-ray multiplicity distributions are spin-sensitive observables that may contain interesting information which should be reproducible be fission models. These distributions correlated with individual fission fragments can be extracted by double-gating on γ-ray transitions in the HPGe detectors
A lowering of the measured intensity occurs when using γ-γ coincidence spectroscopy to detect the isotope since the 2+ side-feeding is missed, but the e↵ect is eliminated by using single γ ray detection of the 2++−!0+ transitions
Summary
The ⌫-Ball experimental campaign was carried out in 2018 at the ALTO facility of the IJC Laboratory in Orsay. The ⌫-Ball spectrometer [1] is a hybrid Germanium, BGO and LaBr3 spectrometer ideally suited to the study of fast-neutron induced fission. The experimental campaign for fission studies took place over a period of 7 weeks to investigate fast neutron induced fission of 232Th(n,f) at an average neutron energy of 1.7 MeV, 238U(n,f) at average neutron energies of 1.7 and 3.5 MeV, and spontaneous fission of 252Cf. The twin goals of these experiments were nuclear structure studies via high-resolution spectroscopy of neutron rich isotopes and studies of the fission process itself. The twin goals of these experiments were nuclear structure studies via high-resolution spectroscopy of neutron rich isotopes and studies of the fission process itself The latter goal is the focus of this current paper. Which could all be correlated with the detection of individual fragments from observation of the characteristic prompt and delayed γ-ray decays in the HPGe detectors
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