Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 4: Instrumentation and Applications I

HK 4.9: Talk

Monday, March 8, 2004, 18:00–18:15, C

Experimental Investigations of Advanced Cold Moderators and Comparison with MCNPX Simulations — •K. Nuenighoff — Forschungszentrum Jülich GmbH, 52425 Jülich

The aim of the JESSICA experiment at the Jülich proton accelerator COSY is the investigation of the characteristics of advanced cold moderators for spallation neutron sources. In this contribution we will present the neutron energy spectra for methane hydrate and mesitylene and discuss the advantages and disadvantages of both materials. We will furhter show first comparisons of the measured energy spectra of an ice moderator at different temperatures with Monte-Carlo simulations performed with MCNPX applying new developed neutron scattering kernels. Further we will show the wavelength dependent time-of-flight spectra for selected materials, like ice, methane-hydrate, and mesitylene.