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

C. Amole1,*, M. Ardid2, I. J. Arnquist3, D. M. Asner3, D. Baxter4, E. Behnke5, P. Bhattacharjee6, H. Borsodi5, M. Bou-Cabo2 et al. (PICO Collaboration)

M. Bou-Cabo2, S. J. Brice7, D. Broemmelsiek7, K. Clark8, J. I. Collar9, P. S. Cooper7, M. Crisler7, C. E. Dahl4,7, M. Das6, F. Debris10, S. Fallows11, J. Farine12, I. Felis2, R. Filgas13, M. Fines-Neuschild10, F. Girard12,10, G. Giroux1, J. Hall3, O. Harris5, E. W. Hoppe3, C. M. Jackson10, M. Jin4, C. B. Krauss11, M. Lafrenière10, M. Laurin10, I. Lawson12,14, A. Leblanc12, I. Levine5, W. H. Lippincott7, E. Mann5, J. P. Martin10, D. Maurya15, P. Mitra11, S. Olson1, R. Neilson16, A. J. Noble1, A. Plante10, R. B. Podviianiuk12, S. Priya15, A. E. Robinson7, M. Ruschman7, O. Scallon12,10, A. Sonnenschein7, N. Starinski10, I. Štekl13, E. Vázquez-Jáuregui17, J. Wells5, U. Wichoski12, V. Zacek10, and J. Zhang4 (PICO Collaboration)

  • 1Department of Physics, Queen’s University, Kingston, K7L 3N6, Canada
  • 2Departamento de Fisica Aplicada, Universitat Politècnica València, València 46022, Spain
  • 3Pacific Northwest National Laboratory, Richland, Washington 99354, USA
  • 4Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA
  • 5Department of Physics, Indiana University South Bend, South Bend, Indiana 46634, USA
  • 6Saha Institute of Nuclear Physics, AstroParticle Physics and Cosmology Division, Kolkata 700064, India
  • 7Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
  • 8Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
  • 9Enrico Fermi Institute, KICP and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
  • 10Département de Physique, Université de Montréal, Montréal H3C 3J7, Canada
  • 11Department of Physics, University of Alberta, Edmonton T6G 2E1, Canada
  • 12Department of Physics, Laurentian University, Sudbury P3E 2C6, Canada
  • 13Institute of Experimental and Applied Physics, Czech Technical University in Prague, Prague Cz-12800, Czech Republic
  • 14SNOLAB, Lively, Ontario P3Y 1N2, Canada
  • 15Bio-Inspired Materials and Devices Laboratory (BMDL), Center for Energy Harvesting Material and Systems (CEHMS), Virginia Tech, Blacksburg, Virginia 24061, USA
  • 16Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
  • 17Instituto de Física, Universidad Nacional Autónoma de México, México D.F. 01000, México

  • *camole@owl.phy.queensu.ca
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Phys. Rev. D 93, 061101(R) – Published 21 March, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.061101

Abstract

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.

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Phys. Rev. D 93, 061101(R)– Published 21 March, 2016
  • Received 15 January 2016
Article part of CHORUS

© 2016 American Physical Society

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