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Dark matter search results from the complete exposure of the PICO-60 C3F8 bubble chamber
Journal article   Open access   Peer reviewed

Dark matter search results from the complete exposure of the PICO-60 C3F8 bubble chamber

C. Amole, M. Ardid, I. J. Arnquist, D. M. Asner, D. Baxter, E. Behnke, M. Bressler, B. Broerman, G. Cao, C. J. Chen, …
Physical review. D, v 100(2), p022001
09 Jul 2019
url
https://doi.org/10.1103/physrevd.100.022001View
Accepted (AM)Open Access (Publisher-Specific) Open
url
https://doi.org/10.1103/PhysRevD.100.022001View
Published, Version of Record (VoR) Open

Abstract

Astronomy & Astrophysics Physical Sciences Physics Physics, Particles & Fields Science & Technology ESI Highly Cited Paper (Incites)
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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Astronomy & Astrophysics
Physics, Particles & Fields
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