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19 April 2024

» arxiv » 1008.3518

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Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CF$_3$I 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 ;
Date:	20 Aug 2010
Abstract:	Data from the operation of a bubble chamber filled with $3.5$ kg of CF$_{3}$I 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 $>20$ GeV/c$^{2}$.
Source:	arXiv, 1008.3518
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