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Mathieu Ribordy

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Related publications (79)

IceTop: The surface component of IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

All-particle cosmic ray energy spectrum measured with 26 IceTop stations

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We report on a measurement of the cosmic ray energy spectrum with the IceTop air shower array, the surface component of the IceCube Neutrino Observatory at the South Pole. The data used in this analysis were taken between June and October, 2007, with 26 su ...

Elsevier Science Bv2013

Design and operation of FACT - the first G-APD Cherenkov telescope

Mathieu Ribordy, Camille Haller, Thomas Günther Bretz, Werner Lustermann

The First G-APD Cherenkov Telescope (FACT) is designed to detect cosmic gamma-rays with energies from several hundred GeV up to about 10 TeV using the Imaging Atmospheric Cherenkov Technique. In contrast to former or existing telescopes, the camera of the ...

Iop Publishing Ltd2013

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

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

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

Introducing the CTA concept

Christophe Bauer, Francisco Sanchez, Michael Werner, Mathieu Ribordy, Munehito Kagaya, Steve Couturier, Xiaoqing Zhou, Thomas Günther Bretz, Reto Frei, Etienne Antoine Julien Moulin, Bruno Garcia, Werner Lustermann

The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span abou ...

Elsevier Science Bv2013

An improved method for measuring muon energy using the truncated mean of dE/dx

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

The measurement of muon energy is critical for many analyses in large Cherenkov detectors, particularly those that involve separating extraterrestrial neutrinos from the atmospheric neutrino background. Muon energy has traditionally been determined by meas ...

Elsevier Science Bv2013

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

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

Observation Of Cosmic-Ray Anisotropy With The Icetop Air Shower Array

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We report on the observation of anisotropy in the arrival direction distribution of cosmic rays at PeV energies. The analysis is based on data taken between 2009 and 2012 with the IceTop air shower array at the south pole. IceTop, an integral part of the I ...

Iop Publishing Ltd2013

Measurement of Atmospheric Neutrino Oscillations with IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We present the first statistically significant detection of neutrino oscillations in the high-energy regime (> 20 GeV) from an analysis of IceCube Neutrino Observatory data collected in 2010 and 2011. This measurement is made possible by the low-energy thr ...

Amer Physical Soc2013

Lateral distribution of muons in IceCube cosmic ray events

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

In cosmic ray air showers, the muon lateral separation from the center of the shower is a measure of the transverse momentum that the muon parent acquired in the cosmic ray interaction. IceCube has observed cosmic ray interactions that produce muons latera ...

American Physical Society2013

First Observation of PeV-Energy Neutrinos with IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We report on the observation of two neutrino-induced events which have an estimated deposited energy in the IceCube detector of 1.04 +/- 0.16 and 1.14 +/- 0.17 PeV, respectively, the highest neutrino energies observed so far. These events are consistent wi ...

American Physical Society2013

Novel technique for supernova detection with IceCube

Mathieu Ribordy

The current supernova detection technique used in IceCube relies on the sudden deviation of the summed photomultiplier noise rate from its nominal value during the neutrino burst, making IceCube a approximate to 3 Megaton effective detection volume - class ...

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

Background studies for acoustic neutrino detection at the South Pole

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

The detection of acoustic signals from ultra-high energy neutrino interactions is a promising method to measure the flux of cosmogenic neutrinos expected on Earth. The energy threshold for this process depends strongly on the absolute noise level in the ta ...

2012

Time-Dependent Searches For Point Sources Of Neutrinos With The 40-String And 22-String Configurations Of Icecube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

This paper presents four searches for flaring sources of neutrinos using the IceCube neutrino telescope. For the first time, a search is performed over the entire parameter space of energy, direction, and time with sensitivity to neutrino flares lasting be ...

2012

G-APDs in Cherenkov astronomy: The FACT camera

Mathieu Ribordy, Thomas Günther Bretz, Werner Lustermann

Geiger-mode avalanche photodiodes (G-APD, SiPM) are a much discussed alternative to photomultiplier tubes in Cherenkov astronomy. The First G-APD Cherenkov Telescope (FACT) collaboration builds a camera based on a hexagonal array of 1440 G-APDs and has now ...

Elsevier Science Bv2012

Electronics for the camera of the First G-APD Cherenkov Telescope (FACT) for ground based gamma-ray astronomy

Mathieu Ribordy, Thomas Günther Bretz, Werner Lustermann

Within the FACT project, we construct a new type of camera based on Geiger-mode avalanche photodiodes (G-APDs). Compared to photomultipliers, G-APDs are more robust, need a lower operation voltage and have the potential of higher photon-detection efficienc ...

2012

The design and performance of IceCube DeepCore

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

The IceCube neutrino observatory in operation at the South Pole, Antarctica, comprises three distinct components: a large buried array for ultrahigh energy neutrino detection, a surface air shower array, and a new buried component called DeepCore. DeepCore ...

2012

Use of event-level neutrino telescope data in global fits for theories of new physics

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We present a fast likelihood method for including event-level neutrino telescope data in parameter explorations of theories for new physics, and announce its public release as part of DarkSUSY 5.0.6. Our construction includes both angular and spectral info ...

Iop Publishing Ltd2012

Design and performance of the South Pole Acoustic Test Setup

Mathieu Ribordy

The South Pole Acoustic Test Setup (SPATS) was built to evaluate the acoustic characteristics of the South Pole ice in the 10-100 kHz frequency range, for the purpose of assessing the feasibility of an acoustic neutrino detection array at the South Pole. T ...

2012

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