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Shirit Cohen

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Publications associées (70)

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Searching for soft relativistic jets in core-collapse supernovae with the IceCube optical follow-up program

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

Context. Transient neutrino sources such as gamma-ray bursts (GRBs) and supernovae (SNe) are hypothesized to emit bursts of high-energy neutrinos on a time-scale of less than or similar to 100 s. While GRB neutrinos would be produced in high relativistic j ...

2012

Constraints on high-energy neutrino emission from SN 2008D

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

SN 2008D, a core collapse supernova at a distance of 27 Mpc, was serendipitously discovered by the Swift satellite through an associated X-ray flash. Core collapse supernovae have been observed in association with long gamma-ray bursts and X-ray flashes an ...

2011

TIME-INTEGRATED SEARCHES FOR POINT-LIKE SOURCES OF NEUTRINOS WITH THE 40-STRING IceCube DETECTOR

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

We present the results of time-integrated searches for astrophysical neutrino sources in both the northern and southern skies. Data were collected using the partially completed IceCube detector in the 40-string configuration recorded between 2008 April 5 a ...

2011

Cosmic ray composition and energy spectrum from 1-30 PeV using the 40-string configuration of IceTop and IceCube

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

The mass composition of high energy cosmic rays depends on their production, acceleration, and propagation. The study of cosmic ray composition can therefore reveal hints of the origin of these particles. At the South Pole, the IceCube Neutrino Observatory ...

Elsevier Science Bv2013

Probing the origin of cosmic rays with extremely high energy neutrinos using the IceCube Observatory

Matthias Wolf, Mark Tobin, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

We have searched for extremely high energy neutrinos using data taken with the IceCube detector between May 2010 and May 2012. Two neutrino-induced particle shower events with energies around 1 PeV were observed, as reported previously. In this work, we in ...

American Physical Society2013

Measurement of South Pole ice transparency with the IceCube LED calibration system

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

The IceCube Neutrino Observatory, approximately 1 km(3) in size, is now complete with 86 strings deployed in the Antarctic ice. IceCube detects the Cherenkov radiation emitted by charged particles passing through or created in the ice. To realize the full ...

Elsevier Science Bv2013

Search for dark matter from the Galactic halo with the IceCube Neutrino Telescope

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

Self-annihilating or decaying dark matter in the Galactic halo might produce high energy neutrinos detectable with neutrino telescopes. We have conducted a search for such a signal using 276 days of data from the IceCube 22-string configuration detector ac ...

American Physical Society2011

IceCube search for dark matter annihilation in nearby galaxies and galaxy clusters

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

We present the results of a first search for self-annihilating dark matter in nearby galaxies and galaxy clusters using a sample of high-energy neutrinos acquired in 339.8 days of live time during 2009/10 with the IceCube neutrino observatory in its 59-str ...

American Physical Society2013

Search for Time-dependent Neutrino Emission from Astrophysical Sources with 3 yr of IceCube Data

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

We present the results of a search for neutrino point sources using the IceCube data collected between 2008 April and 2011 May with three partially completed configurations of the detector: the 40-, 59-, and 79-string configurations. The live-time of this ...

Iop Publishing Ltd2013

IceTop: The surface component of IceCube

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

IceTop, the surface component of the IceCube Neutrino Observatory at the South Pole, is an air shower array with an area of 1 km(2). The detector allows a detailed exploration of the mass composition of primary cosmic rays in the energy range from about 10 ...

Elsevier Science Bv2013

Search for ultrahigh-energy tau neutrinos with IceCube

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

The first dedicated search for ultrahigh-energy (UHE) tau neutrinos of astrophysical origin was performed using the IceCube detector in its 22-string configuration with an instrumented volume of roughly 0: 25 km(3). The search also had sensitivity to UHE e ...

American Physical Society2012

Search for a Lorentz-violating sidereal signal with atmospheric neutrinos in IceCube

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

A search for sidereal modulation in the flux of atmospheric muon neutrinos in IceCube was performed. Such a signal could be an indication of Lorentz-violating physics. Neutrino oscillation models, derivable from extensions to the standard model, allow for ...

American Physical Society2010

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

Improvement in fast particle track reconstruction with robust statistics

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

The IceCube project has transformed 1 km(3) of deep natural Antarctic ice into a Cherenkov detector Muon neutrinos are detected and their direction is inferred by mapping the light produced by the secondary muon track inside the volume instrumented with ph ...

Elsevier2014

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

Energy reconstruction methods in the IceCube neutrino telescope

Matthias Wolf, Mark Tobin, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

Accurate measurement of neutrino energies is essential to many of the scientific goals of large-volume neutrino telescopes. The fundamental observable in such detectors is the Cherenkov light produced by the transit through a medium of charged particles cr ...

Iop Publishing Ltd2014

Measurement of the Atmospheric nu(e) Flux in IceCube

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

We report the first measurement of the atmospheric electron neutrino flux in the energy range between approximately 80 GeV and 6 TeV, using data recorded during the first year of operation of IceCube's DeepCore low-energy extension. Techniques to identify ...

Amer Physical Soc2013

Search for Dark Matter Annihilations in the Sun with the 79-String IceCube Detector

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

We have performed a search for muon neutrinos from dark matter annihilation in the center of the Sun with the 79-string configuration of the IceCube neutrino telescope. For the first time, the DeepCore subarray is included in the analysis, lowering the ene ...

American Physical Society2013

An absence of neutrinos associated with cosmic-ray acceleration in gamma-ray bursts

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

Very energetic astrophysical events are required to accelerate cosmic rays to above 10(18) electronvolts. GRBs (c-ray bursts) have been proposed as possible candidate sources(1-3). In the GRB 'fireball' model, cosmic-ray acceleration should be accompanied ...

2012

Search for a diffuse flux of astrophysical muon neutrinos with the IceCube 40-string detector

Matthias Wolf, Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

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 sourc ...

American Physical Society2011