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Aartsen, M. G.; Adams, J.; Ahrens, M.; Anderson, T.; Ansseau, I.; Anton, G.; Auffenberg, J.; Becker, K.-H.; Bernardini, E.; Binder, G.; Bissok, M.; Blaufuss, E.; Bohm, C.; Börner, M.; Carver, T.; Cheung, E.; Clark, K.; Classen, L.; Rosendo, E. del Pino; With, M. de; Eberhardt, B.; Ehrhardt, T.; Eichmann, B.; Eller, P.; Fahey, S.; Feintzeig, J.; Fösig, C.-C.; Franckowiak, A.; Giang, W.; Glagla, M.; Goldschmidt, A.; Haack, C.; Halzen, F.; Helbing, K.; Hellauer, R.; Hignight, J.; Huang, F.; Huber, M.; Japaridze, G. S.; Jeong, M.; Jurkovic, M.; Kauer, M.; Kemp, J.; Kim, M.; Kintscher, T.; Kiryluk, J.; Klein, S. R.; Koirala, R.; Köpke, L.; Kopper, C.; Kowalski, M.; Krückl, G.; Lauber, F.; Lesiak-Bzdak, M.; Leuner, J.; Maggi, G.; Mandelartz, M.; McNally, F.; Medici, M.; Moulai, M.; Naumann, U.; Niederhausen, H.; Nowicki, S. C.; Nygren, D. R.; Penek, Ö.; Rädel, L.; Rawlins, K.; Relethford, B.; Richman, M.; Ryckbosch, D.; Rysewyk, D.; Sarkar, S.; Satalecka, K.; Schlunder, P.; Schumacher, L.; Seckel, D.; Seunarine, S.; Soldin, D.; Stasik, A.; Stokstad, R. G.; Strotjohann, N. L.; Taavola, H.; Tatar, J.; Ter-Antonyan, S.; Tilav, S.; Toale, P. A.; Tobin, M. N.; Tselengidou, M.; Vandenbroucke, J.; Eijndhoven, N. van; Vanheule, S.; Wallraff, M.; Wandkowsky, N.; Weaver, Ch; Weiss, M. J.; Wiebe, K.; Wiebusch, C. H.; Xu, D. L.; Yanez, J. P.; Yoshida, S.
The Astrophysical journal, 10/2016, Letnik: 830, Številka: 2Journal Article
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 (1016 eV) arriving within a small solid angle. The all-sky search method covers from −90° to approximately −50° 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.
