Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 42: Nuclear and Particle Astrophysics III

HK 42.2: Gruppenbericht

Donnerstag, 11. März 2004, 14:00–14:30, F

Investigation of solid D₂ for UCN sources — •Klaus Kirch¹, F. Atchison¹, K. Bodek², B. van den Brandt¹, T. Bryś¹, M. Daum¹, P. Fierlinger¹, P. Geltenbort³, M. Giersch⁴, P. Hautle¹, M. Hino⁵, R. Henneck¹, M. Kasprzak², J. Kohlbrecher¹, J.A. Konter¹, G. Kühne¹, M. Kuźniak², K. Mishima⁶, A. Pichlmaier¹, D. Rätz¹, A. Serebrov^1,7, M. Utsuro⁶, A. Wokaun¹, and J. Zmeskal⁴ — ¹PSI, Villigen, CH — ²JU Cracow, PL — ³ILL Grenoble, FR — ⁴IMEP Wien, AU — ⁵KURRI, Kyoto, JP — ⁶RCNP Osaka, JP — ⁷PNPI Gatchina, RU

Solid deuterium (sD₂) is a favourite converter material for the production of ultra-cold neutrons (UCN) in the next generation of UCN sources. Some of its critical neutronic properties still remain to be investigated. Among these, the most important ones concern UCN scattering cross sections which determine the extraction efficiency of UCN from sD₂ and thus the source yield. These cross sections might depend on specific conditions of a given sD₂ sample and could possibly be influenced. An apparatus for the preparation and characterization of solid deuterium samples for neutron beam experiments with simultaneous optical control has been built. We report first results from transmission and scattering experiments with cold, very cold and ultra-cold neutrons on sD₂ along with light transmission and Raman scattering studies.