The Antares detector Creusot, A.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2013, Letnik:
718
Journal Article
Recenzirano
The Antares Neutrino Telescope is the first operational Neutrino Telescope in the Mediterranean Sea. It has been completed in May 2008 and is meant to perform neutrino astronomy via a large ...three-dimensional array of photo-multiplier tubes. This note describes the design, the construction and the functioning of the telescope in the deep sea, offshore from Toulon in France, as well as the performances of the detector.
Latest results of the Pierre Auger Observatory Creusot, A.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2012, Letnik:
662
Journal Article
Recenzirano
The Pierre Auger Observatory measures extensive air showers induced by ultra-high energy cosmic rays using two methods: a sampling of the shower particles at the ground level and the detection of the ...fluorescence light emitted by the air molecules after the shower crossing. The southern site of the Pierre Auger Observatory is acquiring data since 2004. The first results were published few years ago. This article is dedicated to the presentation of the last results, taking into account the data up to end of March 2009. The energy spectrum, the anisotropies in the arrival directions and the mass composition of the cosmic rays are discussed here as well as the extrapolations of the proton–air cross-section in the hadronic models.
PMT measurements in Antares Creusot, A.; Kalekin, O.; Kulikovskiy, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2013, Letnik:
725
Journal Article
Recenzirano
The comparison of simulated and real data in the Antares experiment shows some discrepancies. Differences are observed in the charge distribution of background hits, in the trigger efficiency, and in ...the counting rate of 40K decay induced events. These discrepancies must be understood to improve data analysis. It turns out that most of the simulated/real data mismatch can be explained by a undetailed description of the PMT response in the simulations. PMT parameters such as late pulses, afterpulses and angular acceptance have been reviewed and when necessary measurements of these parameters have been carried out using Antares PMTs and optical modules. In addition a more detailed simulation of the angular acceptance of the Antares optical module has been performed. Results of these studies are presented.
Atmospheric neutrinos are produced during cascades initiated by the interaction of primary cosmic rays with air nuclei. In this paper, a measurement of the atmospheric
energy spectrum in the energy ...range 0.1–200 TeV is presented, using data collected by the ANTARES underwater neutrino telescope from 2008 to 2011. Overall, the measured flux is ∼25 % higher than predicted by the conventional neutrino flux, and compatible with the measurements reported in ice. The flux is compatible with a single power-law dependence with spectral index
γ
meas
=3.58±0.12. With the present statistics the contribution of prompt neutrinos cannot be established.
Advanced
LIGO
detected a significant gravitational wave signal (GW170104) originating from the coalescence of two black holes during the second observation run on January 4th, 2017. An all-sky ...high-energy neutrino follow-up search has been made using data from the
Antares
neutrino telescope, including both upgoing and downgoing events in two separate analyses. No neutrino candidates were found within
±
500
s around the GW event time nor any time clustering of events over an extended time window of
±
3
months. The non-detection is used to constrain isotropic-equivalent high-energy neutrino emission from GW170104 to less than
∼
1.2
×
10
55
erg for a
E
-
2
spectrum. This constraint is valid in the energy range corresponding to the 5–95% quantiles of the neutrino flux 3.2 TeV; 3.6 PeV, if the GW emitter was below the
Antares
horizon at the alert time.
Design, tests and production methods of the photomultiplier bases for the surface detectors of the Pierre Auger Observatory are presented. The voltage divider is a purely resistive chain including a ...low consumption high voltage power supply. Two different output sensitivities have been obtained by using the anode and the last amplified dynode outputs. The charge ratio between the anode and the amplified dynode is around 32. The design ensures the stability of the gain and of the base line for events made of several pulses over a long time duration (up to 20μs) and a total charge ranging from a few to 6×105 photoelectrons (typical value: a few thousands) with a peak photocathode current of up to 200nA. The pre-production, test and mounting on photomultipliers of 200 bases has been carried out. The total production is 5000 pieces.
Atmospheric neutrinos are produced during cascades initiated by the interaction of primary cosmic rays with air nuclei. In this paper, a measurement of the atmospheric
νμ + ¯νμ energy spectrum in the ...energy range 0.1–200 TeV is presented, using data collected by the ANTARES underwater neutrino telescope from 2008 to 2011. Overall,
the measured flux is ∼25 % higher than predicted by the conventional neutrino flux, and compatible with the measurements
reported in ice. The flux is compatible with a single power-law dependence with spectral index γmeas = 3.58 ± 0.12. With the present statistics the contribution of prompt neutrinos cannot be established.
Cherenkov light induced by radioactive decay products is one of the major sources of background light for deep-sea neutrino telescopes such as ANTARES. These decays are at the same time a powerful ...calibration source. Using data collected by the ANTARES neutrino telescope from mid 2008 to 2017, the time evolution of the photon detection efficiency of optical modules is studied. A modest loss of only 20% in 9 years is observed. The relative time calibration between adjacent modules is derived as well.
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