Dark matter search results from the PICO-2L C$_3$F$_8$ bubble chamber [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. High Energy Physics Division, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Article numbers 231,302 : digital, PDF file
- Additional Creators:
- Fermi National Accelerator Laboratory
United States. Department of Energy. High Energy Physics Division
United States. Department of Energy. Office of Scientific and Technical Information
- New data are reported from the operation of a 2 liter C<sub>3</sub>F<sub>8</sub> bubble chamber in the SNOLAB underground laboratory, with a total exposure of 211.5 kg days at four different energy thresholds below 10 keV. These data show that C<sub>3</sub>F<sub>8</sub> provides excellent electron-recoil and alpha rejection capabilities at very low thresholds. The chamber exhibits an electron-recoil sensitivity of < 3.5 × 10<sup>–10</sup> and an alpha rejection factor of > 98.2%. These data also include the first observation of a dependence of acoustic signal on alpha energy. Twelve single nuclear recoil event candidates were observed during the run. The candidate events exhibit timing characteristics that are not consistent with the hypothesis of a uniform time distribution, and no evidence for a dark matter signal is claimed. Lastly, these data provide the most sensitive direct detection constraints on WIMP-proton spin-dependent scattering to date, with significant sensitivity at low WIMP masses for spin-independent WIMP-nucleon scattering.
- Published through SciTech Connect.
"arXiv eprint number arXiv:1503.00008"
Physical Review Letters 114 23 ISSN 0031-9007; PRLTAO AM
- Funding Information:
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