Dark matter spin-dependent limits for WIMP interactions on 19F by PICASSO
Abstract
The PICASSO experiment at SNOLAB reports new results for spin-dependent WIMP interactions on 19F 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 19F of 65 g and 69 g respectively and a total exposure of 13.75 ± 0.48 kgd. No dark matter signal was found and for WIMP masses around 24 GeV /c2 new limits have been obtained on the spin-dependent cross section on 19F of σF = 13.9 pb (90% C.L.) which can be converted into cross section limits on protons and neutrons of σp = 0.16 pb and σn = 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.
- Publication:
-
Physics Letters B
- Pub Date:
- November 2009
- DOI:
- 10.1016/j.physletb.2009.11.019
- arXiv:
- arXiv:0907.0307
- Bibcode:
- 2009PhLB..682..185A
- Keywords:
-
- Dark matter;
- WIMPS;
- Superheated droplets;
- SNOLAB;
- 95.35.+d;
- 29.40.-n;
- 34.50.BW;
- Dark matter;
- Radiation detectors;
- High Energy Physics - Experiment
- E-Print:
- Revised version, accepted for publication in Phys. Lett. B, 20 pages, 7 figures
