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Miller, Jonathan
Publications (2 of 2) Show all publications
Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J. A., Ahlers, M., . . . Zarzhitsky, P. (2011). First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector. Physical Review D, 84(7), 072001.
Open this publication in new window or tab >>First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector
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2011 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 84, no 7, 072001- p.Article in journal (Refereed) Published
Abstract [en]

We report on the first search for atmospheric and for diffuse astrophysical neutrino-induced showers (cascades) in the IceCube detector using 257 days of data collected in the year 2007-2008 with 22 strings active. A total of 14 events with energies above 16 TeV remained after event selections in the diffuse analysis, with an expected total background contribution of 8.3 +/- 3.6. At 90% confidence we set an upper limit of E(2)Phi(90%CL) < 3.6 x 10(-7) GeV.cm(-2).s(-1).sr(-1) on the diffuse flux of neutrinos of all flavors in the energy range between 24 TeV and 6.6 PeV assuming that Phi proportional to E(-2) and the flavor composition of the nu(e):nu(mu):nu(tau) flux is 1:1:1 at the Earth. The atmospheric neutrino analysis was optimized for lower energies. A total of 12 events were observed with energies above 5 TeV. The observed number of events is consistent with the expected background, within the uncertainties.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-161555 (URN)10.1103/PhysRevD.84.072001 (DOI)000295541100001 ()
Available from: 2011-11-20 Created: 2011-11-15 Last updated: 2017-12-08Bibliographically approved
Abbasi, R., Abdou, Y., Abu-Zayyad, T., Adams, J., Aguilar, J. A., Ahlers, M., . . . Zoll, M. (2011). Search for a diffuse flux of astrophysical muon neutrinos with the IceCube 40-string detector. Physical Review D, 84(8), 082001.
Open this publication in new window or tab >>Search for a diffuse flux of astrophysical muon neutrinos with the IceCube 40-string detector
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2011 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 84, no 8, 082001- p.Article in journal (Refereed) Published
Abstract [en]

The IceCube Neutrino Observatory is a 1 km(3) detector currently taking data at the South Pole. One of the main strategies used to look for astrophysical neutrinos with IceCube is the search for a diffuse flux of high-energy neutrinos from unresolved sources. A hard energy spectrum of neutrinos from isotropically distributed astrophysical sources could manifest itself as a detectable signal that may be differentiated from the atmospheric neutrino background by spectral measurement. This analysis uses data from the IceCube detector collected in its half completed configuration which operated between April 2008 and May 2009 to search for a diffuse flux of astrophysical muon neutrinos. A total of 12 877 upward-going candidate neutrino events have been selected for this analysis. No evidence for a diffuse flux of astrophysical muon neutrinos was found in the data set leading to a 90% C. L. upper limit on the normalization of an E(-2) astrophysical nu(mu) flux of 8.9 x 10(-9) GeV cm(-2) s(-1) sr(-1). The analysis is sensitive in the energy range between 35 TeV and 7 PeV. The 12 877 candidate neutrino events are consistent with atmospheric muon neutrinos measured from 332 GeV to 84 TeV and no evidence for a prompt component to the atmospheric neutrino spectrum is found.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-162702 (URN)10.1103/PhysRevD.84.082001 (DOI)000296523900001 ()
Available from: 2011-12-07 Created: 2011-12-05 Last updated: 2017-12-08Bibliographically approved
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