PREMODERATOR STUDIES FOR A COUPLED LIQUID-HYDROGEN MODERATOR IN PULSED SPALLATION NEUTRON SOURCES

Authors
KIYANAGI Y WATANABE N IWASA H
Citation
Y. Kiyanagi et al., PREMODERATOR STUDIES FOR A COUPLED LIQUID-HYDROGEN MODERATOR IN PULSED SPALLATION NEUTRON SOURCES, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 343(2-3), 1994, pp. 558-562
Citations number
3
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
343
Issue
2-3
Year of publication
1994
Pages
558 - 562
Database
ISI
SICI code
0168-9002(1994)343:2-3<558:PSFACL>2.0.ZU;2-1
Abstract
A coupled liquid-hydrogen moderator with a premoderator is one of the most promising candidates for a cold neutron source at an intense puls ed spallation neutron source. The choice of the premoderator material is especially important since the neutronic performance strongly depen ds on the material. We experimentally studied premoderators of polyeth ylene, water and zirconium hydride. The cold neutron intensity from a coupled liquid-hydrogen moderator with a ZrH2 premoderator is unexpect edly low: about 75% of that with a polyethylene premoderator. However, the pulse widths (FWHM) of the former are narrower than those of the latter, and the peak intensities are almost unchanged. We also discuss the function of the premoderator.