Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-07-02
Phys.Lett.B682:185-192,2009
Physics
High Energy Physics
High Energy Physics - Experiment
Revised version, accepted for publication in Phys. Lett. B, 20 pages, 7 figures
Scientific paper
10.1016/j.physletb.2009.11.019
The PICASSO experiment at SNOLAB reports new results for spin-dependent WIMP interactions on $^{19}$F using the superheated droplet technique. A new generation of detectors and new features which enable background discrimination via the rejection of non-particle induced events are described. First results are presented for a subset of two detectors with target masses of $^{19}$F of 65 g and 69 g respectively and a total exposure of 13.75 $\pm$ 0.48 kgd. No dark matter signal was found and for WIMP masses around 24 GeV/c$^2$ new limits have been obtained on the spin-dependent cross section on $^{19}$F of $\sigma_F$ = 13.9 pb (90% C.L.) which can be converted into cross section limits on protons and neutrons of $\sigma_p$ = 0.16 pb and $\sigma_n$ = 2.60 pb respectively (90% C.L). The obtained limits on protons restrict recent interpretations of the DAMA/LIBRA annual modulations in terms of spin-dependent interactions.
Archambault Sylvain
Aubin Françcois
Auger Martin
Behnke E.
Beltran B.
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