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Shirit Cohen

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Publications associées (70)

Multiyear search for dark matter annihilations in the Sun with the AMANDA-II and IceCube detectors

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

A search for an excess of muon neutrinos from dark matter annihilations in the Sun has been performed with the AMANDA-II neutrino telescope using data collected in 812 days of live time between 2001 and 2006 and 149 days of live time collected with the AMA ...

American Physical Society2012

Search for ultrahigh-energy tau neutrinos with IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

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

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

Searches For Periodic Neutrino Emission From Binary Systems With 22 And 40 Strings Of Icecube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

In this paper, we present the results of searches for periodic neutrino emission from a catalog of binary systems. Such modulation, observed in the photon flux, would be caused by the geometry of these systems. In the analysis, the period is fixed by these ...

2012

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

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

Measurement of acoustic attenuation in South Pole ice

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

Using the South Pole Acoustic Test Setup (SPATS) and a retrievable transmitter deployed in holes drilled for the IceCube experiment, we have measured the attenuation of acoustic signals by South Pole ice at depths between 190 m and 500 m. Three data sets, ...

2011

OBSERVATION OF ANISOTROPY IN THE ARRIVAL DIRECTIONS OF GALACTIC COSMIC RAYS AT MULTIPLE ANGULAR SCALES WITH IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

Between 2009 May and 2010 May, the IceCube neutrino detector at the South Pole recorded 32 billion muons generated in air showers produced by cosmic rays with a median energy of 20 TeV. With a data set of this size, it is possible to probe the southern sky ...

2011

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

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

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

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

Constraints on the extremely-high energy cosmic neutrino flux with the IceCube 2008-2009 data

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We report on a search for extremely-high energy neutrinos with energies greater than 10(6) GeV using the data taken with the IceCube detector at the South Pole. The data was collected between April 2008 and May 2009 with the half-completed IceCube array. T ...

American Physical Society2011

Measurement of the atmospheric neutrino energy spectrum from 100 GeV to 400 TeV with IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

A measurement of the atmospheric muon neutrino energy spectrum from 100 GeV to 400 TeV was performed using a data sample of about 18 000 up-going atmospheric muon neutrino events in IceCube. Boosted decision trees were used for event selection to reject mi ...

American Physical Society2011

Constraints on high-energy neutrino emission from SN 2008D

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

Limits on Neutrino Emission from Gamma-Ray Bursts with the 40 String IceCube Detector

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

IceCube has become the first neutrino telescope with a sensitivity below the TeV neutrino flux predicted from gamma-ray bursts if gamma-ray bursts are responsible for the observed cosmic-ray flux above 10(18) eV. Two separate analyses using the half-comple ...

2011

IceCube sensitivity for low-energy neutrinos from nearby supernovae

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

This paper describes the response of the IceCube neutrino telescope located at the geographic south pole to outbursts of MeV neutrinos from the core collapse of nearby massive stars. IceCube was completed in December 2010 forming a lattice of 5160 photomul ...

2011

Search for neutrino-induced cascades with five years of AMANDA data

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen

We report on the search for electromagnetic and hadronic showers ("cascades") produced by a diffuse flux of extraterrestrial neutrinos in the AMANDA neutrino telescope. Data for this analysis were recorded during 1001 days of detector livetime in the years ...

2011

First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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 ...

American Physical Society2011

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

Search for relativistic magnetic monopoles with the AMANDA-II neutrino telescope

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We present the search for Cherenkov signatures from relativistic magnetic monopoles in data taken with the AMANDA-II detector, a neutrino telescope deployed in the Antarctic ice cap at the Geographic South Pole. The non-observation of a monopole signal in ...

2010

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