Dark matter search results from the complete exposure of the PICO-60 C3F8 Bubble Chamber

PICO Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

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 WIMP-proton spin-dependent cross section at 2.5 × 1041 cm2 for a 25 GeV WIMP, and improve on previous PICO results for 3–5 GeV WIMPs by an order of magnitude.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Feb 11 2019

ASJC Scopus subject areas

  • General

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