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

Skeppstedt, O Roth, HA Lindstrom, L Wadsworth, R Hibbert, I Kelsall, N Jenkins, D Grawe, H Gorska, M Moszynski, M Sujkowski, Z Wolski, D Kapusta, M Hellstrom, M Kalogeropoulos, S Oner, D Johnson, A Cederkall, J Klamra, W Nyberg, J Weiszflog, M Kay, J Griffiths, R Narro, JG Pearson, C Eberth, J

O. Skeppstedt et al., The EUROBALL neutron wall - design and performance tests of neutron detectors, NUCL INST A, 421(3), 1999, pp. 531-541

15

INGLESE

Article

Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT

0168-9002 → ACNP

421

3

1999

531 - 541

ISI

0168-9002(19990201)421:3<531:TENW-D>2.0.ZU;2-D

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.