Improved limits on spin-dependent WIMP-proton interactions from a two liter CF3I bubble chamber

E. Behnke*, J. Behnke, S. J. Brice, D. Broemmelsiek, J. I. Collar, P. S. Cooper, M. Crisler, C. E. Dahl, D. Fustin, J. Hall, J. H. Hinnefeld, M. Hu, I. Levine, E. Ramberg, T. Shepherd, A. Sonnenschein, M. Szydagis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

117 Scopus citations


Data from the operation of a bubble chamber filled with 3.5 kg of CF 3I in a shallow underground site are reported. An analysis of ultrasound signals accompanying bubble nucleations confirms that alpha decays generate a significantly louder acoustic emission than single nuclear recoils, leading to an efficient background discrimination. Three dark matter candidate events were observed during an effective exposure of 28.1kgday, consistent with a neutron background. This observation provides strong direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering for WIMP masses >20GeV/c2.

Original languageEnglish (US)
Article number021303
JournalPhysical review letters
Issue number2
StatePublished - 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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