Dark matter spin-dependent limits for WIMP interactions on 19F by PICASSO

S. Archambault, F. Aubin, M. Auger, E. Behnke, B. Beltran, K. Clark, X. Dai, A. Davour, J. Farine, R. Faust, M. H. Genest, G. Giroux, R. Gornea, C. Krauss, S. Kumaratunga, I. Lawson, C. Leroy, L. Lessard, C. Levy, I. LevineR. MacDonald, J. P. Martin, P. Nadeau, A. Noble, M. C. Piro, S. Pospisil, T. Shepherd, N. Starinski, I. Stekl, C. Storey, U. Wichoski, V. Zacek

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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 kg d. 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.

Original languageEnglish (US)
Pages (from-to)185-192
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number2
StatePublished - Nov 30 2009


  • Dark matter
  • Superheated droplets

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