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20 April 2024

» arxiv » 1702.7666

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Dark Matter Search Results from the PICO-60 C$_3$F$_8$ Bubble Chamber
C. Amole ; M. Ardid ; I. J. Arnquist ; D. M. Asner ; D. Baxter ; E. Behnke ; P. Bhattacharjee ; H. Borsodi ; M. Bou-Cabo ; P. Campion ; G. Cao ; C. J. Chen ; U. Chowdhury ; K. Clark ; J. I. Collar ; P. S. Cooper ; M. Crisler ; G. Crowder ; C. E. Dahl ; M. Das ; S. Fallows ; J. Farine ; I. Felis ; R. Filgas ; F. Girard ; G. Giroux ; J. Hall ; O. Harris ; E. W. Hoppe ; M. Jin ; C. B. Krauss ; M. Laurin ; I. Lawson ; A. Leblanc ; I. Levine ; W. H. Lippincott ; F. Mamedov ; D. Maurya ; P. Mitra ; T. Nania ; R. Neilson ; A. J. Noble ; S. Olson ; A. Ortega ; A. Plante ; R. Podviyanuk ; S. Priya ; A. E. Robinson ; A. Roeder ; O. Scallon ; S. Seth ; A. Sonnenschein ; N. Starinski ; I. Štekl ; F. Tardif ; E. Vázquez-Jáuregui ; J. Wells ; U. Wichoski ; Y. Yan ; V. Zacek ; J. Zhang ;
Date:	24 Feb 2017
Abstract:	New results are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 52 kg of C$_3$F$_8$ located in the SNOLAB underground laboratory. As in previous PICO bubble chambers, PICO-60 C$_3$F$_8$ exhibits excellent electron recoil and alpha decay rejection, and the observed multiple-scattering neutron rate indicates a single-scatter neutron background of less than 1 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 WIMP-proton spin-dependent cross section at 3.4 $ imes$ 10$^{-41}$ cm$^2$ for a 30-GeV$ hinspace$c$^{-2}$ WIMP, more than one order of magnitude improvement from previous PICO results.
Source:	arXiv, 1702.7666
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