Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CFI Bubble Chamber
arXiv:1008.3518 · doi:10.1103/PhysRevLett.106.021303
Abstract
Data from the operation of a bubble chamber filled with 3.5 kg of CFI 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 the strongest direct detection constraint to date on WIMP-proton spin-dependent scattering for WIMP masses GeV/c.
4 pages, 4 figures V2 submitted to match journal version
References in corpus (5)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Deducing the nature of dark matter from direct and indirect detection experiments in the absence of collider signatures of new physics
- Improved Spin-Dependent WIMP Limits from a Bubble Chamber
- Discrimination of nuclear recoils from alpha particles with superheated liquids
- Implications for the Constrained MSSM from a new prediction for b to s gamma
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