Direct WIMP Detection Using Scintillation Time Discrimination in Liquid Argon

Details Direct WIMP Detection Using Scintillation Time Discrimination in Liquid Argon Direct WIMP Detection Using Scintillation Time Discrimination in Liquid Argon

2004-11-15

arxiv.org/abs/astro-ph/0411358v1

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures

Scientific paper

Discrimination between electron and nuclear recoil events in a liquid argon scintillation detector has been demonstrated with simulations by using the differences in the scintillation photon time distribution between these classes of events. A discrimination power greater than 10^{8} is predicted for a liquid argon experiment with a 10 keV threshold, which would mitigate electron and gamma-ray backgrounds, including beta decays of 39-Ar and 42-Ar in atmospheric argon. A dark matter search using a ~2 kg argon target viewed by immersed photomultiplier tubes would allow a sensitivity to a spin-independent WIMP-nucleon cross-section of ~10^{-43} cm^{2} for a 100 GeV WIMP, assuming a one-year exposure. This technique could be used to scale the target mass to the tonne scale, allowing a sensitivity of ~10^{-46} cm^{2}.

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