Deep-Water Neutrino Telescope in Lake Baikal Allakhverdyan, V. A.; Avrorin, A. D.; Avrorin, A. V. ...
Physics of atomic nuclei,
12/2021, Letnik:
84, Številka:
9
Journal Article
Recenzirano
The Baikal-GVD deep-water neutrino telescope of the cubic kilometer scale, focused on research in the field of astrophysics and particle physics, is being built in Lake Baikal. As of 2021, the ...effective volume of the detector reaches 0.4 km
3
for cascades generated by high-energy astrophysical neutrinos. The paper describes the design and basic characteristics of the telescope data acquisition system, discusses some aspects of deep-water engineering related to the deployment of the detector, and presents selected results obtained with the partially complete detector.
European Physical Journal C 84, 112 (2024) The Cherenkov Telescope Array and the KM3NeT neutrino telescopes are major
upcoming facilities in the fields of $\gamma$-ray and neutrino astronomy,
...respectively. Possible simultaneous production of $\gamma$ rays and neutrinos
in astrophysical accelerators of cosmic-ray nuclei motivates a combination of
their data. We assess the potential of a combined analysis of CTA and KM3NeT
data to determine the contribution of hadronic emission processes in known
Galactic $\gamma$-ray emitters, comparing this result to the cases of two
separate analyses. In doing so, we demonstrate the capability of Gammapy, an
open-source software package for the analysis of $\gamma$-ray data, to also
process data from neutrino telescopes. For a selection of prototypical
$\gamma$-ray sources within our Galaxy, we obtain models for primary proton and
electron spectra in the hadronic and leptonic emission scenario, respectively,
by fitting published $\gamma$-ray spectra. Using these models and instrument
response functions for both detectors, we employ the Gammapy package to
generate pseudo data sets, where we assume 200 hours of CTA observations and 10
years of KM3NeT detector operation. We then apply a three-dimensional binned
likelihood analysis to these data sets, separately for each instrument and
jointly for both. We find that the largest benefit of the combined analysis
lies in the possibility of a consistent modelling of the $\gamma$-ray and
neutrino emission. Assuming a purely leptonic scenario as input, we obtain, for
the most favourable source, an average expected 68% credible interval that
constrains the contribution of hadronic processes to the observed $\gamma$-ray
emission to below 15%.
Reconstructed tracks of muons produced in neutrino interactions provide the precise probe for the neutrino direction. Therefore, track-like events are a powerful tool to search for neutrino point ...sources. Recently, Baikal-GVD has demonstrated the first sample of low-energy neutrino candidate events extracted from the data of the season 2019 in a so-called single-cluster analysis - treating each cluster as an independent detector. In this paper, the extension of the track-like event analysis to a wider data set is discussed and the first high-energy track-like events are demonstrated. The status of multi-cluster track reconstruction and that of the event analysis are also discussed.
Baikal-GVD (Gigaton Volume Detector) is a neutrino telescope installed at a
depth of 1366 m in Lake Baikal. The expedition of 2023 brought the number of
optical modules in the array up to 3492 ...(including experimental strings). These
optical modules detect the Cherenkov radiation from secondary charged particles
coming from the neutrino interactions. Neutrinos produce different kinds of
topologically distinct light signatures. Charged current muon neutrino
interactions create an elongated track in the water. Charged and neutral
current interactions of other neutrino flavors yield hadronic and
electromagnetic cascades. The background in the neutrino cascade channel arises
mainly due to discrete stochastic energy losses produced along atmospheric muon
tracks. In this paper, a developed algorithm for the cascade event selection is
presented.
The deployment of the Baikal-GVD deep underwater neutrino telescope is in
progress now. About 3500 deep underwater photodetectors (optical modules)
arranged into 12 clusters are operating in Lake ...Baikal. For increasing the
efficiency of cascade-like neutrino event detection, the telescope deployment
scheme was slightly changed. Namely, the inter-cluster distance was reduced for
the newly deployed clusters and additional string of optical modules are added
between the clusters. The first inter-cluster string was installed in 2022 and
two such strings were installed in 2023. This paper presents a Monte Carlo
estimate of the impact of these configuration changes on the cascade detection
efficiency as well as technical implementation and results of in-situ tests of
the inter-cluster strings.
Baikal-GVD is a next generation, kilometer-scale neutrino telescope currently
under construction in Lake Baikal. GVD consists of multi-megaton subarrays
(clusters) and is designed for the detection ...of astrophysical neutrino fluxes
at energies from a few TeV up to 100 PeV. The large detector volume and modular
design of Baikal-GVD allows for the measurements of the astrophysical diffuse
neutrino flux to be performed already at early phases of the array
construction. We present here recent results of the measurements on the diffuse
cosmic neutrino flux obtained with the Baikal-GVD neutrino telescope using
cascade-like events.
Baikal Gigaton Volume Detector is a cubic kilometer scale neutrino telescope
under construction in Lake Baikal. As of July 2023, Baikal-GVD consists of 96
fully deployed strings resulting in 3456 ...optical modules installed. The
observation of neutrinos is based on detection of Cherenkov radiation emitted
by the products of neutrino interactions. In this contribution, description of
the double cascade reconstruction technique as well as evaluation of precision
of this algorithm is given.
We present the results of the two-year (2021-2022) monitoring of absorption and scattering lengths of light with wavelength 400-620 nm within the effective volume of the deep underwater neutrino ...telescope Baikal-GVD, which were measured by a device Baikal-5D No.2. The Baikal-5D No.2. was installed during the 2021 winter expedition at a depth of 1180 m. The absorption and scattering lengths were measured every week in 9 spectral points. The device Baikal-5D No.2 also has the ability to measure detailed scattering and absorption spectra. The data obtained make it possible to estimate the range of changes in the absorption and scattering lengths over a sufficiently long period of time and to investigate the relationship between the processes of changes in absorption and scattering. An analysis was made of changes in absorption and scattering spectra for the period 2021-2022.
The Baikal-GVD is a deep-underwater neutrino telescope being constructed in Lake Baikal. After the winter 2023 deployment campaign the detector consists of 3456 optical modules installed on 96 ...vertical strings. The status of the detector and progress in data analysis are discussed in present report. The Baikal-GVD data collected in 2018-2022 indicate the presence of cosmic neutrino flux in high-energy cascade events consistent with observations by the IceCube neutrino telescope. Analysis of track-like events results in identification of first high-energy muon neutrino candidates. These and other results from 2018-2022 data samples are reviewed in this report.
The Baikal-GVD neutrino detector is a deep-underwater neutrino telescope under construction and recently after the winter 2023 deployment it consists of 3456 optical modules attached on 96 vertical ...strings. This 3-dimensional array of photo-sensors allows to observe ambient light in the vicinity of the Baikal-GVD telescope that is associated mostly with water luminescence. Results on time and space variations of the luminescent activity are reviewed based on data collected in 2018-2022.
