Freiburg 2008 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 86: Niederenergie-Neutrinophysik und Suche nach Dunkler Materie I

T 86.8: Vortrag

Montag, 3. März 2008, 18:35–18:50, KGII-HS 2004

Backgrounds of the XENON10 Experiment at the Gran Sasso Underground Laboratory — •Marijke Haffke for the XENON collaboration — Universität Zürich

The XENON10 Experiment is designed for direct detection of dark matter particles via their elastic scattering of Xe nuclei. It was deployed in Gran Sasso Underground Laboratory in spring 2006 and took data until November 2007.

One of the best motivated candidates for cold dark matter are WIMPs. To detect these weakly interacting particles it is crucial to reduce, and to identify the origin of all the background components.

The XENON10 detector is shielded by 33 tonnes of Pb and 1.5 tonnes of polyethylene, which sufficiently reduce the external background from natural radioactivity. The primary sources of the internal gamma background are U, Th, K, Cs and Co decays in the detector materials. The sources of the internal neutron background are (alpha,n) and fission reactions in the detector and shield materials.

We will present a complete background model based on Monte Carlo simulations of the detailed XENON10 geometry, and compare with data obtained during the WIMP search runs.