Portal de Periódicos da CAPES

Dark matter search results from the complete exposure of the PICO-60 C 3 F 8 bubble chamber

2019; American Physical Society; Volume: 100; Issue: 2 Linguagem: Inglês

10.1103/physrevd.100.022001

2470-0037

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, Gavin Crowder, N. A. Cruz-Venegas, C. E. Dahl, Mala Das, S. Fallows, J. Farine, I. Felis, R. Filgas, F. Girard, G. Giroux, J. Hall, C.A. Hardy, Orin Harris, Teresa A. Hillier, E. W. Hoppe, C. M. Jackson, M. Jin, Lorenz Cuno Klopfenstein, Tetiana Kozynets, C. B. Krauss, M. Laurin, I. Lawson, Alexandre 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. Diago Ortega, M.-C. Piro, A. Plante, R.B. Podviyanuk, Shashank Priya, Alan Robinson, Sujit Kumar 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,

Radiation Therapy and Dosimetry

Final results are reported from operation of the PICO-60 C$_3$F$_8$ dark matter detector, a bubble chamber filled with 52 kg of C$_3$F$_8$ 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 $\times$ 10$^{-41}$ cm$^2$ for a 25 GeV WIMP, and improve on previous PICO results for 3-5 GeV WIMPs by an order of magnitude.