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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 SNOLABunderground laboratory. PICO-60 is the largest bubble chamber to search fordark matter to date. With an analyzed exposure of 92.8 livedays, PICO-60exhibits the same excellent background rejection observed in smaller bubblechambers. Alpha decays in PICO-60 exhibit frequency-dependent acousticcalorimetry, similar but not identical to that reported recently in aC$_3$F$_8$ bubble chamber. PICO-60 also observes a large population of unknownbackground events, exhibiting acoustic, spatial, and timing behaviorsinconsistent with those expected from a dark matter signal. These behaviorsallow for analysis cuts to remove all background events while retaining$48.2\%$ of the exposure. Stringent limits on weakly interacting massiveparticles interacting via spin-dependent proton and spin-independent processesare set, and most interpretations of the DAMA/LIBRA modulation signal as darkmatter interacting with iodine nuclei are ruled out.

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