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. 2017 Jun 23;118(25):251301.
doi: 10.1103/PhysRevLett.118.251301. Epub 2017 Jun 23.

Dark Matter Search Results from the PICO-60 C_{3}F_{8} Bubble Chamber

C Amole  1 , M Ardid  2 , I J Arnquist  3 , D M Asner  3 , D Baxter  4   5 , E Behnke  6 , P Bhattacharjee  7 , H Borsodi  6 , M Bou-Cabo  2 , P Campion  8 , G Cao  1 , C J Chen  4 , U Chowdhury  1 , K Clark  9   10 , J I Collar  11 , P S Cooper  5 , M Crisler  3   5 , G Crowder  1 , C E Dahl  4   5 , M Das  7 , S Fallows  12 , J Farine  9 , I Felis  2 , R Filgas  13 , F Girard  9   14 , G Giroux  1 , J Hall  3 , O Harris  6   15 , E W Hoppe  3 , M Jin  4 , C B Krauss  12 , M Laurin  14 , I Lawson  9   10 , A Leblanc  9 , I Levine  6 , W H Lippincott  5 , F Mamedov  13 , D Maurya  16 , P Mitra  12 , T Nania  6 , R Neilson  8 , A J Noble  1 , S Olson  1 , A Ortega  11 , A Plante  14 , R Podviyanuk  9 , S Priya  16 , A E Robinson  5 , A Roeder  6 , R Rucinski  5 , O Scallon  9 , S Seth  7 , A Sonnenschein  5 , N Starinski  14 , I Štekl  13 , F Tardif  14 , E Vázquez-Jáuregui  9   17 , J Wells  6 , U Wichoski  9 , Y Yan  16 , V Zacek  14 , J Zhang  4 ; PICO Collaboration
Affiliations

Dark Matter Search Results from the PICO-60 C_{3}F_{8} Bubble Chamber

C Amole et al. Phys Rev Lett. .

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 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 3.4×10^{-41} cm^{2} for a 30-GeV c^{-2} WIMP, more than 1 order of magnitude improvement from previous PICO results.

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