Improved dark matter search results from PICO-2L Run 2

By C. Amole, M. Ardid, I. Arnquist, D. Asner, D. Baxter, E. Behnke, P. Bhattacharjee, H. Borsodi, M. Bou-Cabo, S. Brice and 48 more. 2016

146 citations recorded by the source corpus.

New data are reported from a second run of the 2-liter PICO-2L C3F8 bubble chamber with a total exposure of 129 kg-days at a thermodynamic threshold energy of 3.3 keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both 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-recoil and alpha decay rejection 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 WIMP masses <50 GeV/c2.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/21765e389a95e4899cbe26c0978fd2324040ed5c

Citations in the corpus

• Dark matter direct-detection experiments (2015, unknown): “rongest exclusion limits on the spin-dependent WIMP-proton cross-section (see gure16). The experiment operates at the SNOLAB underground laboratory (see section4) both the PICO-60[363] and the PICO-2L[364] bubble chambers. The 2-liter PICO-2L C 3F 8 bubble chamber has been operated with a threshold ”