Journal
PHYSICAL REVIEW D
Volume 100, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.022001
Keywords
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Funding
- SNOLAB
- Canada Foundation for Innovation
- Province of Ontario Ministry of Research and Innovation
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- National Science Foundation (NSF) [0919526, 1506337, 1242637, 1205987, 1806722]
- U.S. Department of Energy (DOE) Office of Science, Office of High Energy Physics [DE-SC-0012161]
- DOE Office of Science Graduate Student Research (SCGSR) award
- DGAPA-UNAM (PAPIIT) [IA100118]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT, Mexico) [252167, A1-S-8960]
- Department of Atomic Energy (DAE), Government of India, under the Centre for AstroParticle Physics II project
- European Regional Development FundProject Engineering applications of microworld physics [02.1.01/0.0/0.0/16_019/0000766]
- Spanish (Ministry of Science, Innovation and Universities) Ministerio de Ciencia, Innovacion y Universidades [FPA2017-90566-REDC]
- Kavli Institute for Cosmological Physics at the University of Chicago through NSF [1125897]
- Kavli Foundation
- Fermi National Accelerator Laboratory [DE-AC02-07CH11359]
- Pacific Northwest National Laboratory
- U.S. Department of Energy [DE-AC05-76RL01830]
- WestGrid
- Direct For Mathematical & Physical Scien
- Division Of Physics [1806722, 1242637] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205987, 0919526] Funding Source: National Science Foundation
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Final results are reported from operation of the PICO-60 C3F8 dark matter detector, a bubble chamber filled with 52 kg of C3F8 located in the SNOLAB underground laboratory. The chamber was operated at thermodynamic thresholds as low as 1.2 keV without loss of stability. A new blind 1404-kg-day exposure at 2.45 keV threshold was acquired with approximately the same expected total background rate as the previous 1167-kg-day exposure at 3.3 keV. This increased exposure is enabled in part by a new optical tracking analysis to better identify events near detector walls, permitting a larger fiducial volume. These results set the most stringent direct-detection constraint to date on the weakly interacting massive particle (WIMP)-proton spin-dependent cross section at 3.2 x 10(-41) cm(2) for a 25 GeV WIMP, improving on previous PICO results for 3-5 GeV WIMPs by an order of magnitude.
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