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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [5]; ;  [3];  [6];  [7];  [4];  [7];  [4];  [8];  [6];  [6];  [6];  [7];  [3]; ;  [7] more »;  [9] « less
  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)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
DM-Ice
OSTI Identifier:
1249199
Alternate Identifier(s):
OSTI ID: 1236545
Report Number(s):
FERMILAB-PUB-15-531-AE; arXiv:1509.02486
Journal ID: ISSN 2470-0010; PRVDAQ; 1392437
Grant/Contract Number:  
AC02-07CH11359; FC52-08NA28752
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 4; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DM-Ice; sodium iodide; muons; phosphorescence; annual modulation; dark matter; direct detection; WIMP; South Pole; IceCube

Citation Formats

Cherwinka, J., Grant, D., Halzen, F., Heeger, K. M., Hsu, L., A. J. F. Hubbard, Karle, A., Kauer, M., Kudryavtsev, V. A., Lim, K. E., Macdonald, C., Maruyama, R. H., Paling, S., Pettus, W., Pierpoint, Z. P., Reilly, B. N., Robinson, M., Sandstrom, P., N. J.C. Spooner, Telfer, S., and Yang, L. Measurement of muon annual modulation and muon-induced phosphorescence in NaI(Tl) crystals with DM-Ice17. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.93.042001.
Cherwinka, J., Grant, D., Halzen, F., Heeger, K. M., Hsu, L., A. J. F. Hubbard, Karle, A., Kauer, M., Kudryavtsev, V. A., Lim, K. E., Macdonald, C., Maruyama, R. H., Paling, S., Pettus, W., Pierpoint, Z. P., Reilly, B. N., Robinson, M., Sandstrom, P., N. J.C. Spooner, Telfer, S., & Yang, L. Measurement of muon annual modulation and muon-induced phosphorescence in NaI(Tl) crystals with DM-Ice17. United States. doi:10.1103/PhysRevD.93.042001.
Cherwinka, J., Grant, D., Halzen, F., Heeger, K. M., Hsu, L., A. J. F. Hubbard, Karle, A., Kauer, M., Kudryavtsev, V. A., Lim, K. E., Macdonald, C., Maruyama, R. H., Paling, S., Pettus, W., Pierpoint, Z. P., Reilly, B. N., Robinson, M., Sandstrom, P., N. J.C. Spooner, Telfer, S., and Yang, L. Mon . "Measurement of muon annual modulation and muon-induced phosphorescence in NaI(Tl) crystals with DM-Ice17". United States. doi:10.1103/PhysRevD.93.042001. https://www.osti.gov/servlets/purl/1249199.
@article{osti_1249199,
title = {Measurement of muon annual modulation and muon-induced phosphorescence in NaI(Tl) crystals with DM-Ice17},
author = {Cherwinka, J. and Grant, D. and Halzen, F. and Heeger, K. M. and Hsu, L. and A. J. F. Hubbard and Karle, A. and Kauer, M. and Kudryavtsev, V. A. and Lim, K. E. and Macdonald, C. and Maruyama, R. H. and Paling, S. and Pettus, W. and Pierpoint, Z. P. and Reilly, B. N. and Robinson, M. and Sandstrom, P. and N. J.C. Spooner and Telfer, S. and Yang, L.},
abstractNote = {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.},
doi = {10.1103/PhysRevD.93.042001},
journal = {Physical Review D},
number = 4,
volume = 93,
place = {United States},
year = {2016},
month = {2}
}

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