Abstract
The existing Medley setup is being upgraded with Parallel Plate Avalanche Counters (PPACs) to measure neutron-induced fission cross sections. Single-gap PPACs have been developed for that purpose. The time resolution of the PPACs have been measured using a dedicated setup where, either α particles or fission fragments, are detected in coincidence by three PPACs and a Silicon detector. The results reported here demonstrate that the developed PPACs are suitable for the intended measurements in the white neutron beam at the NFS facility at GANIL.
Highlights
A Parallel Plate Avalanche Counter (PPAC) is a type of gas-filled detector widely used for detection of heavy ions [1]
PPACs will be used as a part of the upgraded Medley setup, which is briefly described in Section 2, with the aim of being able to measure neutron-induced fission cross sections at a neutron source, such as the Neutrons For Science (NFS) facility [2] at GANIL (France)
A plot of time di↵erences versus the amplitude of the signal in PPAC D makes this separation clearer and makes possible to select events corresponding to light fission fragments (LFF), as shown in Fig. 4 by the black contour
Summary
A Parallel Plate Avalanche Counter (PPAC) is a type of gas-filled detector widely used for detection of heavy ions [1]. A PPAC consists of two thin parallel electrodes separated by a gap filled with a gas at a few mbar pressure. Thanks to the low sensitivity to weakly ionizing particles, PPACs are suitable for detecting heavy ions (e.g. fission fragments) originating from neutron-induced reactions, in particular, at a neutron spallation source where they can be directly exposed to intense fluxes of neutrons and gamma rays. We report on the current status of the development of the PPACs for the mentioned setup and, in particular, we focus on recent measurements of the time resolution of these detectors. The results of those characterization measurements serve as a starting point for a discussion on the suitability of the developed detectors for the intended purpose
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