PICASSO, an Experiment for Direct Search of Cold Dark Matter

Details PICASSO, an Experiment for Direct Search of Cold Dark Matter PICASSO, an Experiment for Direct Search of Cold Dark Matter

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..958..200l&link_type=abstract

NUCLEAR PHYSICS METHODS AND ACCELERATORS IN BIOLOGY AND MEDICINE: Fourth International Summer School on Nuclear Physics Methods

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Dark Matter, Origin, Formation, And Abundances Of The Elements, Neutrino, Muon, Pion, And Other Elementary Particle Detectors, Cosmic Ray Detectors, Supersymmetric Models, Dark Energy

Scientific paper

There is strong evidence that a large fraction of the matter in the Universe is non-luminous and non-baryonic. The mass components of the Universe are ~4% of baryonic (visible) matter, 23% of cold dark matter and 73% of dark energy. The lightest neutralino, χ, predicted in supersymmetric (SUSY) extensions of the Standard Model (SM) emerges as the most promising candidate for dark matter. The PICASSO experiment is searching for cold dark matter through the direct detection of neutralinos via their spin-dependent interactions with nuclei. The experiment is installed in the Sudbury Neutrino Observatory Laboratory at a depth of 2070 m (6000 mwe). PICASSO makes use of the superheated droplet technique with C4F10 as the active material and searches for χ interactions on 19F. The experimental technique used by PICASSO is reviewed and results of the measurements are presented in terms of limits on the spin-dependent χ-proton and χ-neutron cross sections. The results exclude regions of spin dependent χ-nucleon interaction parameter space. Future phases of PICASSO are briefiy discussed.

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