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We report the measurement of muons and muon-induced phosphorescence inDM-Ice17, a NaI(Tl) direct detection dark matter experiment at the South Pole.Muon interactions in the crystal are identified by their observed pulse shapeand large energy depositions. The measured muon rate in DM-Ice17 is 2.93 +/-0.04 muons/crystal/day with a modulation amplitude of 12.3 +/- 1.7%, consistentwith expectation. Following muon interactions, we observe long-livedphosphorescence in the NaI(Tl) crystals with a decay time of 5.5 +/- 0.5 s. Theprompt energy deposited by a muon is correlated to the amount of delayedphosphorescence, the brightest of which consist of tens of millions of photons.These photons are distributed over tens of seconds with a rate and arrivaltiming that do not mimic a scintillation signal above 2 keVee. While theproperties of phosphorescence vary among individual crystals, theannually-modulating signal observed by DAMA cannot be accounted for byphosphorescence with the characteristics observed in DM-Ice17.

Measurement of Muon Annual Modulation and Muon-Induced Phosphorescence in NaI(Tl) Crystals with DM-Ice17