Publications by Shirit Cohen | EPFL Graph Search

Investigation of the fine structure of antihydrogen

At the historic Shelter Island Conference on the Foundations of Quantum Mechanics in 1947, Willis Lamb reported an unexpected feature in the fine structure of atomic hydrogen: a separation of the 2S(1/2) and 2P(1/2) states(1). The observation of this separ ...

2020

Observation of the 1S-2P Lyman-alpha transition in antihydrogen

Shirit Cohen

In 1906, Theodore Lyman discovered his eponymous series of transitions in the extreme-ultraviolet region of the atomic hydrogen spectrum(1,2). The patterns in the hydrogen spectrum helped to establish the emerging theory of quantum mechanics, which we now ...

Nature Publishing Group2018

Antihydrogen accumulation for fundamental symmetry tests

Shirit Cohen

Antihydrogen, a positron bound to an antiproton, is the simplest anti-atom. Its structure and properties are expected to mirror those of the hydrogen atom. Prospects for precision comparisons of the two, as tests of fundamental symmetries, are driving a vi ...

Springer Nature2017

The IceProd framework: Distributed data processing for the IceCube neutrino observatory

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

IceCube is a one-gigaton instrument located at the geographic South Pole, designed to detect cosmic neutrinos, identify the particle nature of dark matter, and study high-energy neutrinos themselves. Simulation of the IceCube detector and processing of dat ...

Academic Press Inc Elsevier Science2015

Search for neutrino-induced particle showers with IceCube-40

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

We report on the search for neutrino-induced particle showers, so-called cascades, in the IceCube-40 detector. The data for this search were collected between April 2008 and May 2009 when the first 40 IceCube strings were deployed and operational. Three co ...

American Physical Society2014

IceCube sensitivity for low-energy neutrinos from nearby supernovae (vol 535, pg A109, 2011)

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

Edp Sciences S A2014

Energy reconstruction methods in the IceCube neutrino telescope

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

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

Observation of the cosmic-ray shadow of the Moon with IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We report on the observation of a significant deficit of cosmic rays from the direction of the Moon with the IceCube detector. The study of this "Moon shadow" is used to characterize the angular resolution and absolute pointing capabilities of the detector ...

American Physical Society2014

Search for non-relativistic magnetic monopoles with IceCube

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

The IceCube Neutrino Observatory is a large Cherenkov detector instrumenting of Antarctic ice. The detector can be used to search for signatures of particle physics beyond the Standard Model. Here, we describe the search for non-relativistic, magnetic mono ...

Springer2014

Improvement in fast particle track reconstruction with robust statistics

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

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

Search for a diffuse flux of astrophysical muon neutrinos with the IceCube 59-string configuration

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

A search for high-energy neutrinos was performed using data collected by the IceCube Neutrino Observatory from May 2009 to May 2010, when the array was running in its 59-string configuration. The data sample was optimized to contain muon neutrino induced e ...

American Physical Society2014

Scleractinian coral cell proliferation is reduced in primary culture of suspended multicellular aggregates compared to polyps

Shirit Cohen, Anders Meibom, Agathe Eliette Marie Lecointe, Stéphanie Kéren Cohen, Isabelle Domart-Coulon

Cell cultures from reef-building scleractinian corals are being developed to study the response of these ecologically important organisms to environmental stress and diseases. Despite the importance of cell division to support propagation, cell proliferati ...

Springer2013

NanoSIMS: Technical Aspects and Applications in Cosmochemistry and Biological Geochemistry

Shirit Cohen, Anders Meibom, Stéphanie Kéren Cohen

The NanoSIMS ion probe is a new-generation SIMS instrument, characterised by superior spatial resolution, high sensitivity and multi-collection capability. Isotope studies of certain elements can be conducted with 50-100nm resolution, making the NanoSIMS a ...

Wiley-Blackwell2013

Search for relativistic magnetic monopoles with IceCube

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We present the first results in the search for relativistic magnetic monopoles with the IceCube detector, a subsurface neutrino telescope located in the South Polar ice cap containing a volume of 1 km(3). This analysis searches data taken on the partially ...

American Physical Society2013

GZK Neutrino Search with the IceCube Neutrino Observatory using New Cosmic Ray Background Rejection Methods

Shirit Cohen

Ultra high energy neutrinos are important astrophysical messengers that carry information on processes taking place in extreme astrophysical environments. The detection of neutrinos originating from the Greisen-Zatsepin-Kuzmin (GZK) process would confirm t ...

EPFL2013

South Pole glacial climate reconstruction from multi-borehole laser particulate stratigraphy

Xiaoxia Bai, Mathieu Ribordy, Shirit Cohen, Matthias Wolf

The IceCube Neutrino Observatory and its prototype, AMANDA, were built in South Pole ice, using powerful hot-water drills to cleanly bore >100 holes to depths up to 2500 m. The construction of these particle physics detectors provided a unique opportunity ...

Int Glaciol Soc2013

Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector

Mathieu Ribordy, Shirit Cohen, Matthias Wolf

We report on results of an all-sky search for high-energy neutrino events interacting within the IceCube neutrino detector conducted between May 2010 and May 2012. The search follows up on the previous detection of two PeV neutrino events, with improved se ...

American Association for the Advancement of Science2013

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 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

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

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

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