Improved dark matter search results from PICO-2L Run 2
2016
New data are reported from a second run of the 2-liter PICO-2L C3F8
bubble chamberwith a total exposure of 129 kg-days at a thermodynamic
threshold energyof 3.3 keV. These data show that measures taken to control particulate contamination in the
superheatedfluid resulted in the absence of the anomalous background events observed in the first run of this
bubble chamber. One single nuclear-
recoilevent was observed in the
data,
consistentboth with the predicted background rate from neutrons and with the observed rate of unambiguous multiple-bubble neutron scattering events. The chamber exhibits the same excellent electron-
recoiland
alpha decayrejection as was previously reported. These data provide the most stringent direct detection constraints on
weakly interacting massive particle(
WIMP)-proton spin-dependent scattering to date for
WIMPmasses <50 GeV/c2.
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