Publications de Levent Demirörs

First search for extremely high energy cosmogenic neutrinos with the IceCube Neutrino Observatory

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

We report on the results of the search for extremely-high energy neutrinos with energies above 10(7) GeV obtained with the partially (similar to 30%) constructed IceCube in 2007. From the absence of signal events in the sample of 242.1 days of effective li ...

American Physical Society2010

SEARCH FOR MUON NEUTRINOS FROM GAMMA-RAY BURSTS WITH THE IceCube NEUTRINO TELESCOPE

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

We present the results of searches for high-energy muon neutrinos from 41 gamma-ray bursts (GRBs) in the northern sky with the IceCube detector in its 22 string configuration active in 2007/2008. The searches cover both the prompt and a possible precursor ...

2010

Limits on a muon flux from Kaluza-Klein dark matter annihilations in the Sun from the IceCube 22-string detector

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

A search for muon neutrinos from Kaluza-Klein dark matter annihilations in the Sun has been performed with the 22-string configuration of the IceCube neutrino detector using data collected in 104.3 days of live time in 2007. No excess over the expected atm ...

American Physical Society2010

Measurement Of The Anisotropy Of Cosmic-Ray Arrival Directions With Icecube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs, Matthias Wolf

We report the first observation of an anisotropy in the arrival direction of cosmic rays with energies in the multi-TeV region in the Southern sky using data from the IceCube detector. Between 2007 June and 2008 March, the partially deployed IceCube detect ...

2010

First Neutrino Point-Source Results From The 22 String Icecube Detector

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

We present new results of searches for neutrino point sources in the northern sky, using data recorded in 2007-2008 with 22 strings of the IceCube detector (approximately one-fourth of the planned total) and 275.7 days of live time. The final sample of 511 ...

2009

Determination of the atmospheric neutrino flux and searches for new physics with AMANDA-II

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has accumulated a large sample of atmospheric muon neutrinos in the 100 GeV to 10 TeV energy range. The zenith angle and energy distribution of these events can be u ...

American Physical Society2009

Extending the search for neutrino point sources with iceCube above the horizon

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

Point source searches with the IceCube neutrino telescope have been restricted to one hemisphere, due to the exclusive selection of upward going events as a way of rejecting the atmospheric muon background. We show that the region above the horizon can be ...

2009

SEARCH FOR HIGH-ENERGY MUON NEUTRINOS FROM THE “NAKED-EYE” GRB 080319B WITH THE IceCube NEUTRINO TELESCOPE

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

We report on a search with the IceCube detector for high-energy muon neutrinos from GRB 080319B, one of the brightest gamma-ray bursts (GRBs) ever observed. The fireball model predicts that a mean of 0.1 events should be detected by IceCube for a bulk Lore ...

2009

Limits on a Muon Flux from Neutralino Annihilations in the Sun with the IceCube 22-String Detector

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

A search for muon neutrinos from neutralino annihilations in the Sun has been performed with the IceCube 22-string neutrino detector using data collected in 104.3 days of live time in 2007. No excess over the expected atmospheric background has been observ ...

2009

ERRATUM: “SEARCH FOR HIGH-ENERGY MUON NEUTRINOS FROM THE “NAKED-EYE” GRB 080319B WITH THE ICECUBE NEUTRINO TELESCOPE” (2009, ApJ, 701, 1721)

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Levent Demirörs

2009

Search for point sources of high energy neutrinos with final data from AMANDA-II

Xiaoxia Bai, Mathieu Ribordy, Levent Demirörs

We present a search for point sources of high energy neutrinos using 3.8 yr of data recorded by AMANDA-II during 2000-2006. After reconstructing muon tracks and applying selection criteria designed to optimally retain neutrino-induced events originating in ...

American Physical Society2009

Solar Energetic Particle Spectrum on 2006 December 13 Determined by IceTop

Xiaoxia Bai, Mathieu Ribordy, Levent Demirörs

2008

Search for ultra-high-energy neutrinos with AMANDA-II

Xiaoxia Bai, Mathieu Ribordy, Levent Demirörs, Yi Wang

A search for diffuse neutrinos with energies in excess of 105 GeV is conducted with AMANDA-II data recorded between 2000 and 2002. Above 107 GeV, the Earth is essentially opaque to neutrinos. This fact, combined with the limited overburden of the AMANDA-II ...

2008