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

Citation
O. Skeppstedt et al., The EUROBALL neutron wall - design and performance tests of neutron detectors, NUCL INST A, 421(3), 1999, pp. 531-541
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
0168-9002 → ACNP
Volume
421
Issue
3
Year of publication
1999
Pages
531 - 541
Database
ISI
SICI code
0168-9002(19990201)421:3<531:TENW-D>2.0.ZU;2-D
Abstract
The mechanical design of the EUROBALL neutron wall and neutron detectors, a nd their performance measured with a Cm-246,Cm-248 fission source are descr ibed. The array consists of 15 pseudohexaconical detector units subdivided into three, 149 mm high, hermetically separated segments and a smaller cent ral pentagonal unit subdivided into five segments. The detectors are filled with Bicron BC501A liquid scintillator. Each section of the hexaconical de tectors is viewed by a 130 mm diameter Philips XP4512PA photomultiplier whi le 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 timin g properties of the detectors and an average time resolution of 1.56 ns. Th e factors determining the efficiency of neutron detectors are discussed. Th e total efficiency for the full array for a symmetric fusion-evaporation re action is predicted to be 0.30. (C) 1999 Elsevier Science B.V. All rights r eserved.