Search for a diffuse flux of high-energy with the ANTARES neutrino telescope (original) (raw)
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Search for a diffuse flux of high-energy νμ with the ANTARES neutrino telescope
2011
A search for a diffuse flux of astrophysical muon neutrinos, using data collected by the ANTARES neutrino telescope is presented. A (0.83 × 2π) sr sky was monitored for a total of 334 days of equivalent live time. The searched signal corresponds to an excess of events, produced by astrophysical sources, over the expected atmospheric neutrino background. The observed number of events is found compatible with the background expectation. Assuming an E −2 flux spectrum, a 90% c.l. upper limit on the diffuse ν µ flux of E 2 Φ 90% = 5.3 × 10 −8 GeV cm −2 s −1 sr −1 in the energy range 20 TeV-2.5 PeV is obtained. Other signal models with different energy spectra are also tested and some rejected.
High-energy neutrino flux studied in the ANTARES deep-sea telescope
AIP Conference Proceedings, 2012
High-energy neutrinos from cosmic origin appear to be ideal probes for long-distance astronomy and may provide insight into cosmic particle acceleration mechanisms. The ANTARES deep-sea neutrino telescope, fully operational since May 2008, aims at the detection of upgoing muon tracks caused by high energy neutrinos having passed through the Earth. Stringent limits have been set on the sensitivity to neutrino point sources and a diffuse neutrino flux for the Southern sky.
Search for a diffuse flux of high-energy neutrinos with the NT200 neutrino telescope
International …, 2005
We present the results of a search for high energy extraterrestrial neutrinos with the Baikal underwater Cherenkov detector NT200, based on data taken in 1998-2002 (1038 live days). Upper limits on the diffuse fluxes of ν e + ν µ + ν τ , predicted by several models of AGN-like neutrino sources, are derived. For an E −2 behavior of the neutrino spectrum, our limit is E 2 Φ ν (E) < 8.1 × 10 −7 cm −2 s −1 sr −1 GeV over an neutrino energy range 2 × 10 4 ÷ 5 × 10 7 GeV covering 90% of expected events. The upper limit on the resonantν e diffuse flux is Φν e <3.3×10 −20 cm −2 s −1 sr −1 GeV −1 .
First Search for Point Sources of High Energy Cosmic Neutrinos with the ANTARES Neutrino Telescope
2011
Results are presented of a search for cosmic sources of high energy neutrinos with the ANTARES neutrino telescope. The data were collected during 2007 and 2008 using detector configurations containing between 5 and 12 detection lines. The integrated live time of the analyzed data is 304 days. Muon tracks are reconstructed using a likelihood-based algorithm. Studies of the detector timing indicate a median angular resolution of 0.5 +/- 0.1 degrees. The neutrino flux sensitivity is 7.5 x 10-8 ~ (E/GeV)^-2 GeV^-1 s^-1 cm^-2 for the part of the sky that is always visible (declination < -48 degrees), which is better than limits obtained by previous experiments. No cosmic neutrino sources have been observed.
Journal of Instrumentation, 2021
Addressing the origin of the observed diffuse astrophysical neutrino flux is one of the main challenges in the context of the neutrino astronomy nowadays. Among several astrophysical sources, Gamma-Ray Bursts (GRBs) are considered interesting candidates to be explored. Indeed, being the most powerful explosions observable in the Universe, they are potentially able to achieve the energetics required to reproduce the neutrino flux. Thus, they are expected to provide at least some contribution to the astrophysical diffuse neutrino flux. Within the framework of the fireball model, mesons can be produced during photo-hadronic interactions occurring in the internal shocks between shells emitted by the central engine; from their decays, high-energy gamma rays and neutrinos are expected to be generated. Within this scenario, the results of a stacked search for astrophysical muon neutrinos performed in space and time coincidence with 784 GRBs in the period 2007-2017 using ANTARES data are presented. The neutrino flux expectation from each GRB detectable by ANTARES was calculated in the framework of the classical internal shock model. Given the absence of coincident neutrinos, the contribution of the detected GRB population to the neutrino diffuse flux is constrained to be less than 10% around 100 TeV. In addition, the systematic uncertainties on the diffuse flux are computed by propagating to the stacked limit the uncertainties on the model parameters for each individual burst.
Search for a diffuse flux of astrophysical muon neutrinos with the IceCube 40-string detector
Physical Review D, 2011
The IceCube Neutrino Observatory is a 1km3 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 sources. A hard energy spectrum of neutrinos from isotropically distributed astrophysical sources could manifest itself as a detectable signal that may be differentiated from the atmospheric neutrino background by spectral measurement. This analysis uses data from the IceCube detector collected in its half completed configuration which operated between April 2008 and May 2009 to search for a diffuse flux of astrophysical muon neutrinos. A total of 12 877 upward-going candidate neutrino events have been selected for this analysis. No evidence for a diffuse flux of astrophysical muon neutrinos was found in the data set leading to a 90% C.L. upper limit on the normalization of an E-2 astrophysical νμ flux of 8.9×10-9GeVcm-2s-1sr-1. The analysis is sensitive in the energy range between 35 TeV and 7 PeV. The 12 877 candidate neutrino events are consistent with atmospheric muon neutrinos measured from 332 GeV to 84 TeV and no evidence for a prompt component to the atmospheric neutrino spectrum is found.
Search for diffuse neutrino flux from astrophysical sources with MACRO
Astroparticle Physics, 2003
Many galactic and extragalactic astrophysical sources are currently considered promising candidates as high-energy neutrino emitters. Astrophysical neutrinos can be detected as upward-going muons produced in charged-current interactions with the medium surrounding the detector. The expected neutrino fluxes from various models start to dominate on the atmospheric neutrino background at neutrino energies above some tens of TeV. We present the results of a search for an excess of high-energy upward-going muons among the sample of data collected by MACRO during $5.8 years of effective running time. No significant evidence for this signal was found. As a consequence, an upper limit on the flux of upward-going muons from high-energy neutrinos was set at the level of 1:7 Â 10 À14 cm À2 s À1 sr À1 . The corresponding upper limit for the diffuse neutrino flux was evaluated assuming a neutrino power law spectrum. Our result was compared with theoretical predictions and upper limits from other experiments.