Papers › Dark Matter Search Results from the Complete Exposure of the PICO-60 C₃F₈ Bubble Chamber
Dark Matter Search Results from the Complete Exposure of the PICO-60 C₃F₈ Bubble Chamber
C. Amole, M. Ardid, I. J. Arnquist, D. M. Asner, D. Baxter, E. Behnke, M. Bressler, B. Broerman, G. Cao, C. J. Chen, U. Chowdhury, K. Clark, J. I. Collar, P. S. Cooper, C. B. Coutu, C. Cowles, M. Crisler, G. Crowder, N. A. Cruz-Venegas, C. E. Dahl, M. Das, S. Fallows, J. Farine, I. Felis, R. Filgas, F. Girard, G. Giroux, J. Hall, C. Hardy, O. Harris, T. Hillier, E. W. Hoppe, C. M. Jackson, M. Jin, L. Klopfenstein, C. B. Krauss, M. Laurin, I. Lawson, A. Leblanc, I. Levine, C. Licciardi, W. H. Lippincott, B. Loer, F. Mamedov, P. Mitra, C. Moore, T. Nania, R. Neilson, A. J. Noble, P. Oedekerk, A. Ortega, M. -C. Piro, A. Plante, R. Podviyanuk, S. Priya, A. E. Robinson, S. Sahoo, O. Scallon, S. Seth, A. Sonnenschein, N. Starinski, I. Štekl, T. Sullivan, F. Tardif, E. Vázquez-Jáuregui, N. Walkowski, E. Weima, U. Wichoski, K. Wierman, Y. Yan, V. Zacek, J. Zhang
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Final results are reported from operation of the PICO-60 C₃F₈ dark matter detector, a bubble chamber filled with 52 kg of C₃F₈ located in the SNOLAB underground laboratory. The chamber was operated at thermodynamic thresholds as low as 1.2 keV without loss of stability. A new blind 1404-kg-day exposure at 2.45 keV threshold was acquired with approximately the same expected total background rate as the previous 1167-kg-day exposure at 3.3 keV. This increased exposure is enabled in part by a new optical tracking analysis to better identify events near detector walls, permitting a larger fiducial volume. These results set the most stringent direct-detection constraint to date on the WIMP-proton spin-dependent cross section at 2.5 × 10⁻⁴¹ cm² for a 25 GeV WIMP, and improve on previous PICO results for 3-5 GeV WIMPs by an order of magnitude.
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