The prototyping/early construction phase of the BAIKAL-GVD project Avrorin, A.D.; Avrorin, A.V.; Aynutdinov, V.M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2014, Letnik:
742
Journal Article
Recenzirano
The prototyping phase of the BAIKAL-GVD project has been started in April 2011 with the deployment of a three string engineering array which comprises all basic elements and systems of the Gigaton ...Volume Detector (GVD) in Lake Baikal. In April 2012 the version of engineering array which comprises the first full-scale string of the GVD demonstration cluster had been deployed and operated during 2012. The first stage of the GVD-cluster which consists of three strings was deployed in April 2013. We review the prototyping phase of the BAIKAL-GVD project and describe the configuration and design of the 2013 engineering array.
Current status of the BAIKAL-GVD project Avrorin, A.V.; Aynutdinov, V.M.; Belolaptikov, I.A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2013, Letnik:
725
Journal Article
Recenzirano
We present a status of the Baikal-GVD Project. The objective of this project is a construction of a km3-scale neutrino telescope in the Lake Baikal. As an important milestone, the first GVD ...engineering array has been deployed and ran in April, 2011. Application of a completely new technology gave us an opportunity to study all the basic elements of the future full detector and to finalize the GVD technical design. We discuss the configuration and the design of the engineering array as well as data performance with the preliminary results.
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.
We have analyzed a data set taken over 2.76years live time with the Baikal neutrino telescope NT200. The goal of the analysis is to search for neutrinos from dark matter annihilation in the center of ...the Sun. Apart from the conventional annihilation channels bb¯, W+W- and τ+τ- we consider also the annihilation of dark matter particles into monochromatic neutrinos. From the absence of any excess of events from the direction of the Sun over the expected background, we derive 90% upper limits on the fluxes of muons and muon neutrinos from the Sun, as well as on the elastic cross sections of dark matter scattering on protons.
Hintergrund:
Screeningprogramme für das familiäre Pankreaskarzinom (FPC) basieren auf endosonographischer und/oder MR-tomographischer Bildgebung. Bei bis zu 40% der Risikopersonen (RP) werden hierbei ...zystische Läsionen detektiert, die verdächtig auf kleine intraduktale papilläre muzinösen Neoplasien der Seitengänge (BD-IPMN) sind. Die pathologische Bedeutung dieser Läsionen beim FPC ist bisher nicht geklärt.
Patienten und Methoden:
RP des prospektiven Screeningprogramms der Nationalen Fallsammlung familiäres Pankreaskarzinom mit kleinen „Imaging“ -IPMNs, die sich einer Operation unterzogen, wurden hinsichtlich der klinisch-pathologischen Ergebnisse und der Lokalisation der Läsionen analysiert.
Ergebnisse:
In 11 Jahren (2002 – 2013) nahmen 180 RP aus 81 FPC-Familien am Screeningprogramm teil. 84 RP (46%) wiesen kleine zystische (2 – 10 mm) unizystische Läsionen oder multizystische Läsionen im Pankreas auf, welche MR-tomographisch verdächtig auf BD-IPMN waren. Bei 7 dieser RP mit multiplen Läsionen (> 3) wurde nach interdisziplinärer Besprechung eine Pankreasresektion (6 totale Pankreatektomie, 1 PPPD) durchgeführt, obwohl die Sendai-Kriterien für eine IPMN-Resektion nicht erfüllt waren. Die histologische Aufarbeitung ergab bei 6 dieser Patienten BD-IPMNs mit niedriger bzw. moderater Dysplasie vom gastrischen Typ in Kombination mit multifokalen PanIN2 und PanIN3-Läsionen. Eine Patientin hatte lediglich winzige Gangektasien im Pankreasschwanz mit multifokalen PanIN-II-Läsionen sowie einer PanIN-III-Läsion im Pankreaskopf. Überraschend war, dass die Lokalisation der histologisch gesicherten PanIN2/3-Läsionen nicht mit den präoperativ in der Bildgebung dargestellten zystischen Läsionen korrespondierten und auch retrospektiv nicht sichtbar waren.
Schlussfolgerung:
Im Rahmen des FPC könnte das Vorliegen von multiplen, kleinen „Imaging“-BD-IPMNs ein Indikator für die Präsenz höhergradiger PanIN-Läsionen an anderen Lokalisation im Pankreas sein.
The Tunka-Grande experiment: Status and prospects Monkhoev, R. D.; Budnev, N. M.; Voronin, D. M. ...
Bulletin of the Russian Academy of Sciences. Physics,
04/2017, Letnik:
81, Številka:
4
Journal Article
Recenzirano
The Tunka-Grande scintillation array is described. The first results from its operation are presented. The prospects for studying primary cosmic rays in the energy range of 10
16
to 10
18
eV during ...simultaneous registration of the Cherenkov and charged particle components along with radio emissions from extensive air showers are discussed.
The neutrino telescope Baikal-GVD is designed for search for high energy neutrinos whose sources are not yet reliably identified. It currently includes total of 3456 optical modules arranged on 96 ...strings, providing an effective volume of 0.6 km
for cascades with energy above 1 PeV. We discuss the first results from the partially built experiment, which is currently the largest neutrino telescope in the Northern Hemisphere and still growing up.
Currently, the Baikal-GVD Deep Underwater Neutrino Telescope is being successfully deployed in Lake Baikal. It comprises 96 strings with 3456 optical modules. We present the status and plans for ...further deployment of the Baikal-GVD telescope and discuss the issues related to the development of the next-generation neutrino telescope in Lake Baikal.
The article presents the relevance and advantages of the new gamma observatory TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy), which is being constructed in the Tunka ...Valley 50 km from Lake Baikal. Various detectors of the six TAIGA gamma observatory arrays register the Cherenkov and radio radiation, as well as the electron and muon components of EAS. The primary objective of the TAIGA gamma observatory is to study the high-energy part of the gamma-ray spectrum, in particular, in order to search for Galactic PeVatrons. The energy, direction, and position of the EAS axis are reconstructed in the observatory based on the data of the wide-angle Cherenkov detectors of the TAIGA-HiSCORE experiment. Taking into account this information, the gamma quanta are distinguished from the hadron background using the data obtained by the muon detectors and telescopes that register the EAS image in the Cherenkov light. In this hybrid mode of operation, the atmospheric Cherenkov telescopes can operate in the mono-mode, and the distance between them can be increased to 800–1000 m, which makes it possible to construct an array with an area of 5 km
2
and more at relatively low cost and in a short time. By 2019, the first stage of the gamma observatory with an area of 1 km
2
will be constructed; its expected integral sensitivity for detecting the gamma radiation with an energy of 100 TeV at observation of the source for 300 hours will be approximately
10
–13
TeV cm
–2
s
–1
.
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