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Matthias Wolf

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Related publications (119)

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

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

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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 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

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

3D Near-Infrared Imaging Based on a Single-Photon Avalanche Diode Array Sensor

Edoardo Charbon, Juan Mata Pavia, Matthias Wolf

An imager for optical tomography was designed based on a detector with 128x128 single-photon pixels that included a bank of 32 time-to-digital converters. Due to the high spatial resolution and the possibility of performing time resolved measurements, a ne ...

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

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

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

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 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 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

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

3D Near-infrared Imaging based on a Single-photon Avalanche Diode Array Sensor

Claudio Favi, Cristiano Niclass, Edoardo Charbon, Juan Mata Pavia, Matthias Wolf

A new imager for 3D near-infrared imaging has been designed based on a single-photon avalanche diode (SPAD) imager with 128x128 pixels capable of performing time-resolved measurements with a resolution of 97ps. The imager linearity has been improved to mak ...

2011

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

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

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

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

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

Femtosecond dynamics of electronic states in the Mott insulator 1T-TaS2 by time resolved photoelectron spectroscopy

Helmuth Berger, Luca Perfetti, Matthias Wolf

Photoexcitation of the Mott insulator 1T-TaS2 by an intense laser pulse leads to an ultrafast transition toward a gapless phase. Besides the collapse of the electronic gap, the sudden excitation of the charge density wave (CDW) mode results in periodic osc ...

2008

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