Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-01-10
Phys.Rev.C78:035801,2008
Physics
Nuclear Physics
Nuclear Experiment
13 pages, 14 figures, Revision 3 (published)
Scientific paper
10.1103/PhysRevC.78.035801
Using a single-phase liquid argon detector with a signal yield of 4.85 photoelectrons per keV of electronic-equivalent recoil energy (keVee), we measure the scintillation time dependence of both electronic and nuclear recoils in liquid argon down to 5 keVee. We develop two methods of pulse shape discrimination to distinguish between electronic and nuclear recoils. Using one of these methods, we measure a background and statistics-limited level of electronic recoil contamination to be $7.6\times10^{-7}$ between 60 and 128 keV of nuclear recoil energy (keVr) for a nuclear recoil acceptance of 50% with no nuclear recoil-like events above 72 keVr. Finally, we develop a maximum likelihood method of pulse shape discrimination using the measured scintillation time dependence and predict the sensitivity to WIMP-nucleon scattering in three configurations of a liquid argon dark matter detector.
Coakley Kevin J.
Gastler D.
Hime Andrew
Kearns Edward
Lippincott Hugh W.
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