A Calorimeter Based on Peltier Modules

Volkov, A. S.; Tyagunin, A. V.; Koposov, G. D.

doi:10.1134/s0020441218040267

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(2 citation statements)

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“…Phosphorescence refers to NaI(Tl) scintillation longer than the ∼250 ns primary fluorescent decay component [57]. A suite of NaI(Tl) experiments has observed phosphorescence with timescales ranging from 1.5 µs to 45 days [24,53,[58][59][60][61][62][63][64][65][66][67][68]. Differences in experimental results indicate numerous phosphorescence decay channels.…”

Section: A Phosphorescence In Nai(tl)mentioning

confidence: 99%

“…Phosphorescence has been observed following exposure to cosmic rays, radioactive sources, and ultraviolet (UV) and visible light. It is determined that the initial intensity of decays shorter than the second-scale is proportional to the intensity of incident radiation, while that of longer decays (minutes to hours) is proportional to the absorbed dose [58]. Both the ANAIS and KIMS dark matter experiments have measured elevated trigger rates following large energy depositions.…”

Section: A Phosphorescence In Nai(tl)mentioning

confidence: 99%

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Measurement of muon annual modulation and muon-induced phosphorescence in NaI(Tl) crystals with DM-Ice17

et al. 2016

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We report the measurement of muons and muon-induced phosphorescence in DM-Ice17, a NaI(Tl) direct detection dark matter experiment at the South Pole. Muon interactions in the crystal are identified by their observed pulse shape and large energy depositions. The measured muon rate in DM-Ice17 is 2.93 ± 0.04 µ/crystal/day with a modulation amplitude of 12.3 ± 1.7%, consistent with expectation. Following muon interactions, we observe long-lived phosphorescence in the NaI(Tl) crystals with a decay time of 5.5 ± 0.5 s. The prompt energy deposited by a muon is correlated to the amount of delayed phosphorescence, the brightest of which consist of tens of millions of photons. These photons are distributed over tens of seconds with a rate and arrival timing that do not mimic a scintillation signal above 2 keVee. While the properties of phosphorescence vary among individual crystals, the annually-modulating signal observed by DAMA cannot be accounted for by phosphorescence with the characteristics observed in DM-Ice17.PACS numbers: 95.35.+d, 29.40.Mc, 95.85.Ry

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