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

Journal Article · · Physical Review D
 [1];  [2];  [3];  [4];  [5];  [3];  [6];  [7];  [4];  [7];  [4];  [8];  [6];  [6];  [6];  [7];  [3];  [7];  [9]
  1. Univ. of Wisconsin-Madison, Stoughton, WI (United States)
  2. Univ. of Alberta, Edmonton, AB (Canada)
  3. Univ. of Wisconsin, Madison, WI (United States)
  4. Yale Univ., New Haven, CT (United States)
  5. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  6. Univ. of Wisconsin, Madison, WI (United States); Yale Univ., New Haven, CT (United States)
  7. Univ. of Sheffield, Sheffield (United Kingdom)
  8. STFC Boulby Underground Science Facility, Cleveland (United Kingdom)
  9. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)

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. Furthermore, 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.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE National Nuclear Security Administration (NNSA)
Contributing Organization:
DM-Ice
Grant/Contract Number:
AC02-07CH11359; FC52-08NA28752
OSTI ID:
1249199
Alternate ID(s):
OSTI ID: 1236545
Report Number(s):
FERMILAB-PUB-15-531-AE; arXiv:1509.02486; PRVDAQ; 1392437
Journal Information:
Physical Review D, Vol. 93, Issue 4; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Initial performance of the COSINE-100 experiment journal February 2018
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Performance of ANAIS-112 experiment after the first year of data taking text January 2018

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