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Title: First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17

Abstract

The first search for a dark matter annual modulation signal with NaI(Tl) target material in the Southern Hemisphere conducted with the DM-Ice17 experiment is presented. DM-Ice17 consists of 17 kg of NaI(Tl) scintillating crystal under 2200 m.w.e. overburden of Antarctic glacial ice. The analysis presented here utilizes a 60.8 kg yr exposure. While unable to exclude the signal reported by DAMA/LIBRA, the DM-Ice17 data are consistent with no modulation in the energy range of 4-20 keV, providing the strongest limits on WIMP candidates from a direct detection experiment located in the Southern Hemisphere. Additionally, the successful deployment and stable operation of 17 kg of NaI(Tl) crystal over 3.5 years establishes the South Pole ice as a viable location for future underground, low-background experiments.

Authors:
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Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
DM-Ice Collaboration
OSTI Identifier:
1253581
Report Number(s):
arXiv:1602.05939; FERMILAB-PUB-16-043-AE
Journal ID: ISSN 2470-0010; PRVDAQ; 1422186
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review D; Journal Volume: 95; Journal Issue: 3
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

Citation Formats

Barbosa de Souza, E., Cherwinka, J., Cole, A., Ezeribe, A. C., Grant, D., Halzen, F., Heeger, K. M., Hsu, L., Hubbard, A. J. F., Jo, J. H., Karle, A., Kauer, M., Kudryavtsev, V. A., Lim, K. E., Macdonald, C., Maruyama, R. H., Mouton, F., Paling, S. M., Pettus, W., Pierpoint, Z. P., Reilly, B. N., Robinson, M., Rogers, F. R., Sandstrom, P., Scarff, A., Spooner, N. J. C., Telfer, S., and Yang, L. First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.95.032006.
Barbosa de Souza, E., Cherwinka, J., Cole, A., Ezeribe, A. C., Grant, D., Halzen, F., Heeger, K. M., Hsu, L., Hubbard, A. J. F., Jo, J. H., Karle, A., Kauer, M., Kudryavtsev, V. A., Lim, K. E., Macdonald, C., Maruyama, R. H., Mouton, F., Paling, S. M., Pettus, W., Pierpoint, Z. P., Reilly, B. N., Robinson, M., Rogers, F. R., Sandstrom, P., Scarff, A., Spooner, N. J. C., Telfer, S., & Yang, L. First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17. United States. doi:10.1103/PhysRevD.95.032006.
Barbosa de Souza, E., Cherwinka, J., Cole, A., Ezeribe, A. C., Grant, D., Halzen, F., Heeger, K. M., Hsu, L., Hubbard, A. J. F., Jo, J. H., Karle, A., Kauer, M., Kudryavtsev, V. A., Lim, K. E., Macdonald, C., Maruyama, R. H., Mouton, F., Paling, S. M., Pettus, W., Pierpoint, Z. P., Reilly, B. N., Robinson, M., Rogers, F. R., Sandstrom, P., Scarff, A., Spooner, N. J. C., Telfer, S., and Yang, L. Tue . "First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17". United States. doi:10.1103/PhysRevD.95.032006. https://www.osti.gov/servlets/purl/1253581.
@article{osti_1253581,
title = {First search for a dark matter annual modulation signal with NaI(Tl) in the Southern Hemisphere by DM-Ice17},
author = {Barbosa de Souza, E. and Cherwinka, J. and Cole, A. and Ezeribe, A. C. and Grant, D. and Halzen, F. and Heeger, K. M. and Hsu, L. and Hubbard, A. J. F. and Jo, J. H. and Karle, A. and Kauer, M. and Kudryavtsev, V. A. and Lim, K. E. and Macdonald, C. and Maruyama, R. H. and Mouton, F. and Paling, S. M. and Pettus, W. and Pierpoint, Z. P. and Reilly, B. N. and Robinson, M. and Rogers, F. R. and Sandstrom, P. and Scarff, A. and Spooner, N. J. C. and Telfer, S. and Yang, L.},
abstractNote = {The first search for a dark matter annual modulation signal with NaI(Tl) target material in the Southern Hemisphere conducted with the DM-Ice17 experiment is presented. DM-Ice17 consists of 17 kg of NaI(Tl) scintillating crystal under 2200 m.w.e. overburden of Antarctic glacial ice. The analysis presented here utilizes a 60.8 kg yr exposure. While unable to exclude the signal reported by DAMA/LIBRA, the DM-Ice17 data are consistent with no modulation in the energy range of 4-20 keV, providing the strongest limits on WIMP candidates from a direct detection experiment located in the Southern Hemisphere. Additionally, the successful deployment and stable operation of 17 kg of NaI(Tl) crystal over 3.5 years establishes the South Pole ice as a viable location for future underground, low-background experiments.},
doi = {10.1103/PhysRevD.95.032006},
journal = {Physical Review D},
number = 3,
volume = 95,
place = {United States},
year = {Tue Feb 28 00:00:00 EST 2017},
month = {Tue Feb 28 00:00:00 EST 2017}
}
  • Cited by 9
  • Cited by 4
  • 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.more » These photons are distributed over tens of seconds with a rate and arrival timing that do not mimic a scintillation signal above 2 keV ee. 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.« less
  • We report the first analysis of background data from DM-Ice17, a direct-detection dark matter experiment consisting of 17 kg of NaI(Tl) target material. It was codeployed with IceCube 2457 m deep in the South Pole glacial ice in December 2010 and is the first such detector operating in the Southern Hemisphere. The background rate in the 6.5–8.0 keV ee region is measured to be 7.9 ± 0.4 counts/day/keV/kg. This is consistent with the expected background from the detector assemblies with negligible contributions from the surrounding ice. The successful deployment and operation of DM-Ice17 establishes the South Pole ice as amore » viable location for future underground, low-background experiments in the Southern Hemisphere. Furthermore, the detector assembly and deployment are described here, as well as the analysis of the DM-Ice17 backgrounds based on data from the first two years of operation after commissioning, July 2011–June 2013.« less
  • Cited by 24