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19 April 2024

» arxiv » 1510.7754

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Dark Matter Search Results from the PICO-60 CF$_3$I Bubble Chamber
C. Amole ; M. Ardid ; D. M. Asner ; D. Baxter ; E. Behnke ; P. Bhattacharjee ; H. Borsodi ; M. Bou-Cabo ; S. J. Brice ; D. Broemmelsiek ; K. Clark ; J. I. Collar ; P. S. Cooper ; M. Crisler ; C. E. Dahl ; S. Daley ; M. Das ; F. Debris ; N. Dhungana ; J. Farine ; I. Felis ; R. Filgas ; F. Girard ; G. Giroux ; A. Grandison ; M. Hai ; J. Hall ; O. Harris ; M. Jin ; C. B. Krauss ; S. Fallows ; M. Lafrenière ; M. Laurin ; I. Lawson ; I. Levine ; W. H. Lippincott ; E. Mann ; D. Maurya ; P. Mitra ; R. Neilson ; A. J. Noble ; A. Plante ; R. B. Podviianiuk ; S. Priya ; E. Ramberg ; A. E. Robinson ; R. Rucinski ; M. Ruschman ; O. Scallon ; S. Seth ; P. Simon ; A. Sonnenschein ; I. Štekl ; E. Vàzquez-Jàuregui ; J. Wells ; U. Wichoski ; V. Zacek ; J. Zhang ; I. A. Shkrob ;
Date:	27 Oct 2015
Abstract:	New data are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 36.8 kg of CF$_3$I and located in the SNOLAB underground laboratory. PICO-60 is the largest bubble chamber to search for dark matter to date. With an analyzed exposure of 92.8 live-days, PICO-60 exhibits the same excellent background rejection observed in smaller bubble chambers. Alpha decays in PICO-60 exhibit frequency-dependent acoustic calorimetry, similar but not identical to that reported recently in a C$_3$F$_8$ bubble chamber. PICO-60 also observes a large population of unknown background events, exhibiting acoustic, spatial, and timing behaviors inconsistent with those expected from a dark matter signal. These behaviors allow for analysis cuts to remove all background events while retaining $48.2\%$ of the exposure. Stringent limits on WIMPs interacting via spin-dependent proton and spin-independent processes are set, and the interpretation of the DAMA/LIBRA modulation signal as dark matter interacting with iodine nuclei is ruled out.
Source:	arXiv, 1510.7754
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