Fission fragment atomic number measurements using Bragg detectors

N.V. Sosnin*, A.G. Smith, T. Wright, U. Köster, A. Blanc, B.S. Nara Singh, R.L. Kennedy-Reid, P.J. Davies

*Corresponding author for this work

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Abstract

A Bragg detector with a Frisch grid and 1 metre-long time-of-flight section with microchannel plate assemblies was characterized at the Lohengrin fission fragment separator at the Institut Laue-Langevin (ILL) by measuring 235U fission fragments of selected masses and energies at the Lohengrin focal plane. The aim of the measurements was to investigate the response of Bragg detectors to differing nuclear charge states. Energy-loss and a signal-risetime dependent parameters were defined and extracted from the accumulated signal pulse shapes, and their behaviour as a function of fragment velocity was investigated. The experimental results are compared to a SRIM-2013 simulation. Measurements of fission fragment ranges in isobutane are presented. Average proton numbers for measured fragment masses were identified and could be resolved by the parameters, which exhibited monotonic variation with charge. The results differed from SRIM both in trends and in values, with SRIM simulations exhibiting non-monotonic behaviour with proton number.
Original languageEnglish
Article number163397
Number of pages7
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume957
Early online date10 Jan 2020
DOIs
Publication statusPublished - 21 Mar 2020

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Keywords

  • Fission fragment charge
  • SRIM
  • Ionization chamber
  • Sub-Bragg peak spectroscopy
  • Lohengrin
  • Fission fragment range

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