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Xiaoxia Bai

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Publications associées (76)

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

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

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

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

Measurement of the cosmic ray energy spectrum with IceTop-73

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

We report on the measurement of the all-particle cosmic ray energy spectrum with the IceTop air shower array in the energy range from 1.58 PeV to 1.26 EeV. The IceTop air shower array is the surface component of the IceCube Neutrino Observatory at the geog ...

American Physical Society2013

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

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

Measurement of the Atmospheric nu(e) Flux in IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

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

Science and technology research and development in support to ITER and the Broader Approach at CEA

Jonathan Bryan Lister, Vincent Martin, Nicolas Mellet, Louis Nicolas, Xiaoxia Bai, Javier García Hernández, Alexis Berne, Fang Liu, Daniel Keller, Antoine Pierre Emmanuel Alexis Merle, Jonathan Bastien Cottet, Joan Decker, Yi Zhang, Yiming Li, Hui Wang

In parallel to the direct contribution to the procurement phase of ITER and Broader Approach, CEA has initiated research & development programmes, accompanied by experiments together with a significant modelling effort, aimed at ensuring robust operation, ...

IOP Publishing Ltd2013

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

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

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

Neutrino Analysis Of The 2010 September Crab Nebula Flare And Time-Integrated Constraints On Neutrino Emission From The Crab Using Icecube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We present the results of a search for high-energy muon neutrinos with the IceCube detector in coincidence with the Crab Nebula flare reported on 2010 September by various experiments. Due to the unusual flaring state of the otherwise steady source we perf ...

2012

OBSERVATION OF ANISOTROPY IN THE GALACTIC COSMIC-RAY ARRIVAL DIRECTIONS AT 400 TeV WITH ICECUBE

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

In this paper we report the first observation in the Southern hemisphere of an energy dependence in the Galactic cosmic-ray anisotropy up to a few hundred TeV. This measurement was performed using cosmic-ray-induced muons recorded by the partially deployed ...

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

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

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

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

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

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