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

@article{Behnke2011ImprovedLO,
  title={Improved limits on spin-dependent WIMP-proton interactions from a two liter CF3I bubble chamber.},
  author={Ed Behnke and J{\"u}rgen F. Behnke and S. Brice and Daniel R. Broemmelsiek and J. I. Collar and Peter S. Cooper and Michael Crisler and Carl Eric Dahl and Drew Anthony Fustin and J. Hall and Jerry Hinnefeld and M. Hu and Ilan Levine and Erik J. Ramberg and T. Shepherd and A. H. Sonnenschein and Matthew Szydagis},
  journal={Physical review letters},
  year={2011},
  volume={106 2},
  pages={
          021303
        }
}
Data from the operation of a bubble chamber filled with 3.5 kg of CF3I 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 28.1  kg  day, consistent with a neutron background. This observation provides… 

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