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, R Rucinski,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

PHYSICAL REVIEW LETTERS（2017）

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摘要

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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