Journal
PHYSICAL REVIEW D
Volume 93, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.93.052014
Keywords
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Funding
- U.S. Department of Energy, Office of Science, Office of High Energy Physics [DE-SC-0012161]
- National Science Foundation [PHY-1242637, PHY-0919526, PHY-1205987]
- National Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- Spanish Ministerio de Economia y Competitividad [Consolider MultiDark CSD2009-00064]
- Czech Ministry of Education, Youth and Sports [LM2011027]
- [De-AC02-07CH11359]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1242637] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506377, 1205987] Funding Source: National Science Foundation
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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 CF3I 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 C3F8 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.
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