A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

(The n-TOF Collaboration [www.cern.ch/ntof])

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In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, γ) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed.

Original languageEnglish
Article number163981
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Early online date21 Apr 2020
Publication statusPublished - 21 Jul 2020

Bibliographical note

©2020 The Authors


  • U
  • Fission detector
  • n_TOF
  • Time-of-flight

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