https://doi.org/10.1140/epja/i2008-10661-y
Special Article - Tools for Experiment and Theory
Neutron experiments with cryogenic methane hydrate and mesitylene moderators
1
Forschungszentrum Jülich GmbH, Jülich, Germany
2
Institut für Technische Physik, Technische Universität, Graz, Austria
3
Joint Institute of Nuclear Research, Dubna, Russia
4
Centro Atomico Bariloche, Bariloche, Argentina
5
Paul Scherrer Institut, Villigen, Switzerland
Received:
30
June
2008
Accepted:
2
October
2008
Published online:
21
October
2008
In this article we describe the experimental results of a methane hydrate moderator as well as as mesitylene moderator operated at a temperature around 20K at the JESSICA (Jülich Experimental Spallation Target Set-up In COSY Area) experiment at the Jülich cooler synchrotron COSY. For the first time the cold neutron spectrum of a methane hydrate moderator was experimentally investigated. A comparison with a solid methane and an ice moderator atT = 20 K will be shown. MCNPX simulations with new developedS(α,β) scattering kernels will be compared with experimental data. The applicability of mesitylene and methane hydrate as cold moderators at spallation neutron sources will be discussed.
PACS: 24.10.Lx Monte Carlo simulations (including hadron and parton cascades and string breaking models) – / 25.40.Fq Inelastic neutron scattering – / 28.20.-v Neutron physics – / 28.20.Gd Neutron transport: diffusion and moderation –
© SIF, Springer-Verlag Berlin Heidelberg, 2008
