Fission Fragment Atomic Number Measurements Using Bragg Detectors

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Nikolay Sosnin
  • Tobias Wright
  • U Koster
  • A Blanc
  • B.S. Nara Singh
  • R.L. Kennedy-Reid
  • Paul John Davies


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 energiesat the Lohengrinfocal plane. The aim of the measurementswas 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 behaviouras a function of fragment velocitywas investigated. The experimentalresults 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 protonnumber.

Bibliographical metadata

Original languageEnglish
Article number163397
JournalNuclear Instruments and Methods in Physics Research
Early online date10 Jan 2020
Publication statusPublished - 21 Mar 2020