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Search for sources of high-energy neutrons with four years of data from the IceTop detector

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Abstract
IceTop is an air-shower array located on the Antarctic ice sheet at the geographic South Pole. IceTop can detect an astrophysical flux of neutrons from Galactic sources as an excess of cosmic-ray air showers arriving from the source direction. Neutrons are undeflected by the Galactic magnetic field and can typically travel 10 (E/PeV) pc before decay. Two searches are performed using 4 yr of the IceTop data set to look for a statistically significant excess of events with energies above 10 PeV (10(16) eV) arriving within a small solid angle. The all-sky search method covers from -90 degrees to approximately -50 degrees in declination. No significant excess is found. A targeted search is also performed, looking for significant correlation with candidate sources in different target sets. This search uses a higher-energy cut (100 PeV) since most target objects lie beyond 1 kpc. The target sets include pulsars with confirmed TeV energy photon fluxes and high-mass X-ray binaries. No significant correlation is found for any target set. Flux upper limits are determined for both searches, which can constrain Galactic neutron sources and production scenarios.
Keywords
astroparticle physics, cosmic rays, methods: data analysis, COSMIC-RAY ANISOTROPY, POINT SOURCES, GAMMA-RAYS, ARRIVAL DIRECTIONS, GALACTIC-CENTER, EEV NEUTRONS, TEV, NEUTRINOS, ASTRONOMY, ICECUBE

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Chicago
Aartsen, M. G., K. Abraham, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, et al. 2016. “Search for Sources of High-energy Neutrons with Four Years of Data from the IceTop Detector.” AstrOPHYSICAL JOURNAL 830 (2).
APA
Aartsen, M. G., Abraham, K., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., et al. (2016). Search for sources of high-energy neutrons with four years of data from the IceTop detector. AstrOPHYSICAL JOURNAL, 830(2).
Vancouver
1.
Aartsen MG, Abraham K, Ackermann M, Adams J, Aguilar JA, Ahlers M, et al. Search for sources of high-energy neutrons with four years of data from the IceTop detector. AstrOPHYSICAL JOURNAL. 2016;830(2).
MLA
Aartsen, M. G., K. Abraham, M. Ackermann, et al. “Search for Sources of High-energy Neutrons with Four Years of Data from the IceTop Detector.” AstrOPHYSICAL JOURNAL 830.2 (2016): n. pag. Print.
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  abstract     = {IceTop is an air-shower array located on the Antarctic ice sheet at the geographic South Pole. IceTop can detect an astrophysical flux of neutrons from Galactic sources as an excess of cosmic-ray air showers arriving from the source direction. Neutrons are undeflected by the Galactic magnetic field and can typically travel 10 (E/PeV) pc before decay. Two searches are performed using 4 yr of the IceTop data set to look for a statistically significant excess of events with energies above 10 PeV (10(16) eV) arriving within a small solid angle. The all-sky search method covers from -90 degrees to approximately -50 degrees in declination. No significant excess is found. A targeted search is also performed, looking for significant correlation with candidate sources in different target sets. This search uses a higher-energy cut (100 PeV) since most target objects lie beyond 1 kpc. The target sets include pulsars with confirmed TeV energy photon fluxes and high-mass X-ray binaries. No significant correlation is found for any target set. Flux upper limits are determined for both searches, which can constrain Galactic neutron sources and production scenarios.},
  articleno    = {129},
  author       = {Aartsen, M. G. and Abraham, K. and Ackermann, M. and Adams, J. and Aguilar, J. A. and Ahlers, M. and Ahrens, M. and Altmann, D. and Andeen, K. and Anderson, T. and Ansseau, I. and Anton, G. and Archinger, M. and Arg{\"u}elles, C. and Auffenberg, J. and Axani, S. and Bai, X. and Barwick, S. W. and Baum, V. and Bay, R. and Beatty, J. J. and Tjus, J. Becker and Becker, K.-H. and BenZvi, S. and Berghaus, P. and Berley, D. and Bernardini, E. and Bernhard, A. and Besson, D. Z. and Binder, G. and Bindig, D. and Bissok, M. and Blaufuss, E. and Blot, S. and Bohm, C. and B{\"o}rner, M. and Bos, F. and Bose, D. and B{\"o}ser, S. and Botner, O. and Braun, J. and Brayeur, L. and Bretz, H.-P. and Burgman, A. and Carver, T. and Casier, M. and Cheung, E. and Chirkin, D. and Christov, A. and Clark, K. and Classen, L. and Coenders, S. and Collin, G. H. and Conrad, J. M. and Cowen, D. F. and Cross, R. and Day, M. and Andr{\'e}, J. P. A. M. de and Clercq, C. 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L. and Larson, M. J. and Lauber, F. and Lennarz, D. and Lesiak-Bzdak, M. and Leuermann, M. and Leuner, J. and Lu, L. and L{\"u}nemann, J. and Madsen, J. and Maggi, G. and Mahn, K. B. M. and Mancina, S. and Mandelartz, M. and Maruyama, R. and Mase, K. and Maunu, R. and McNally, F. and Meagher, K. and Medici, M. and Meier, M. and Meli, A. and Menne, T. and Merino, G. and Meures, T. and Miarecki, S. and Mohrmann, L. and Montaruli, T. and Moulai, M. and Nahnhauer, R. and Naumann, U. and Neer, G. and Niederhausen, H. and Nowicki, S. C. and Nygren, D. R. and Pollmann, A. Obertacke and Olivas, A. and O{\textquoteright}Murchadha, A. and Palczewski, T. and Pandya, H. and Pankova, D. V. and Penek, {\"O}. and Pepper, J. A. and Heros, C. P{\'e}rez de los and Pieloth, D. and Pinat, E. and Price, P. B. and Przybylski, G. 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  issn         = {0004-637X},
  journal      = {AstrOPHYSICAL JOURNAL},
  language     = {eng},
  number       = {2},
  pages        = {12},
  title        = {Search for sources of high-energy neutrons with four years of data from the IceTop detector},
  url          = {http://dx.doi.org/10.3847/0004-637x/830/2/129},
  volume       = {830},
  year         = {2016},
}

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