The EUROBALL neutron wall - design and performance tests of neutron detectors

Research output: Contribution to journalArticle


The mechanical design of the EUROBALL neutron wall and neutron detectors, and their performance measured with a Cm-246,Cm-248 fission source are described. The array consists of 15 pseudohexaconical detector units subdivided into three, 149 mm high, hermetically separated segments and a smaller central pentagonal unit subdivided into five segments. The detectors are filled with Bicron BC501A liquid scintillator. Each section of the hexaconical detectors is viewed by a 130 mm diameter Philips XP4512PA photomultiplier while the sections of pentagonal detectors are viewed by Philips XP4312B PMTs. The tests of n-gamma discrimination performed by zero-crossing and time-of-flight methods show a full separation of gamma- and neutron events down to 50 keV recoil electron energy. These tests demonstrate the excellent timing properties of the detectors and an average time resolution of 1.56 ns. The factors determining the efficiency of neutron detectors are discussed. The total efficiency for the full array for a symmetric fusion-evaporation reaction is predicted to be 0.30. (C) 1999 Elsevier Science B.V. All rights reserved.


  • O Skeppstedt
  • HA Roth
  • L Lindstrom
  • R Wadsworth
  • I Hibbert
  • N Kelsall
  • D Jenkins
  • H Grawe
  • M Gorska
  • M Moszynski
  • Z Sujkowski
  • D Wolski
  • M Kapusta
  • M Hellstrom
  • S Kalogeropoulos
  • D Oner
  • A Johnson
  • W Klamra
  • J Nyberg
  • M Weiszflog
  • J Kay
  • R Griffiths
  • JG Narro
  • C Pearson
  • J Eberth
External organisations
  • External Organization - Unknown
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Accelerator Physics and Instrumentation


  • EUROBALL neutron wall, neutron detectors, n-gamma discrimination, time-of-flight
Original languageEnglish
Pages (from-to)531-541
JournalNuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
Issue number3
Publication statusPublished - 1999
Publication categoryResearch
Externally publishedYes