Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.251301
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Funding
- 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]
- 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
- Direccion General Asuntos del Personal Academico, Universidad Nacional Autonoma de Mexico (DGAPA-UNAM) through the grant Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT) [IA100316]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) (Mexico) [252167]
- Department of Atomic Energy (DAE), the Government of India, under the Center of AstroParticle Physics II project (CAPP-II) at Saha Institute of Nuclear Physics (SINP)
- Czech Ministry of Education, Youth and Sports [LM2015072]
- Spanish Ministerio de Economia y Competitividad, Consolider MultiDark [CSD2009-00064]
- Kavli Institute for Cosmological Physics at the University of Chicago through NSF [1125897]
- Fermi National Accelerator Laboratory [De-AC02-07CH11359]
- U.S. Department of Energy [DE-AC05-76RL01830]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205987, 1125897, 1242637] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0919526] Funding Source: National Science Foundation
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New results are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 52 kg of C3F8 located in the SNOLAB underground laboratory. As in previous PICO bubble chambers, PICO-60 C3F8 exhibits excellent electron recoil and alpha decay rejection, and the observed multiple-scattering neutron rate indicates a single-scatter neutron background of less than one event per month. A blind analysis of an efficiency-corrected 1167-kg day exposure at a 3.3-keV thermodynamic threshold reveals no single-scattering nuclear recoil candidates, consistent with the predicted background. These results set the most stringent direct-detection constraint to date on the weakly interacting massive particle (WIMP)-proton spin-dependent cross section at 3.4 x 10(-41) cm(2) for a 30-GeVc(-2) WIMP, more than 1 order of magnitude improvement from previous PICO results.
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