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# Title: Dark Matter Search Results from the PICO-60 CF$_3$I Bubble Chamber

Abstract: New data are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 36.8 kg of CF$_3$I and located in the SNOLAB underground laboratory. PICO-60 is the largest bubble chamber to search for dark matter to date. With an analyzed exposure of 92.8 livedays, PICO-60 exhibits the same excellent background rejection observed in smaller bubble chambers. Alpha decays in PICO-60 exhibit frequency-dependent acoustic calorimetry, similar but not identical to that reported recently in a C$_3$F$_8$ bubble chamber. PICO-60 also observes a large population of unknown background events, exhibiting acoustic, spatial, and timing behaviors inconsistent with those expected from a dark matter signal. These behaviors allow for analysis cuts to remove all background events while retaining $48.2\%$ of the exposure. Stringent limits on weakly interacting massive particles interacting via spin-dependent proton and spin-independent processes are set, and most interpretations of the DAMA/LIBRA modulation signal as dark matter interacting with iodine nuclei are ruled out.
 Comments: v3 to reflect published version Subjects: High Energy Physics - Experiment (hep-ex); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Instrumentation and Detectors (physics.ins-det) Journal reference: Phys. Rev. D 93, 052014 (2016) DOI: 10.1103/PhysRevD.93.052014 Cite as: arXiv:1510.07754 [hep-ex] (or arXiv:1510.07754v3 [hep-ex] for this version)

## Submission history

From: Hugh Lippincott [view email]
[v1] Tue, 27 Oct 2015 02:34:20 GMT (799kb,D)
[v2] Wed, 4 Nov 2015 23:58:33 GMT (811kb,D)
[v3] Thu, 3 Mar 2016 20:41:05 GMT (842kb,D)
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