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arXiv · 0907.0307

Dark Matter Spin-Dependent Limits for WIMP Interactions on 19-F 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. Levine·R. 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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Abstract

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 $σ_F$ = 13.9 pb (90% C.L.) which can be converted into cross section limits on protons and neutrons of $σ_p$ = 0.16 pb and $σ_n$ = 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.

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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. Levine, R. 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. 2009-11-10. Dark Matter Spin-Dependent Limits for WIMP Interactions on 19-F by PICASSO. https://doi.org/10.1016/j.physletb.2009.11.019

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