scholarly journals Моделирование оптических концентраторов для модернизированной камеры черенковского гамма-телескопа TAIGA-IACT

2021 ◽  
Vol 91 (11) ◽  
pp. 1601
Author(s):  
А.С. Антонов ◽  
А.А. Богданов ◽  
А.М. Красильщиков ◽  
Е.Е. Холупенко
Keyword(s):  
Gamma Ray ◽  
Optimal Configuration ◽  
Photon Flux ◽  
Design Features ◽  
Flux Intensity

A quantitative simulation of a system of optical concentrators based on Winston's hexagonal cones, intended for the registration camera of the TAIGA-IACT Cherenkov gamma-ray telescope, has been performed. The data on the transmission of the cones are obtained; the distributions of the photon flux intensity in the plane of the detector are given. On the basis of the results obtained, an optimal configuration of optical concentrators is proposed, taking into account the design features of the mount, mirror and TAIGA-IACT camera, as well as the features of its new detector units.

Scintillation crystal design features for a miniature gamma ray camera

2005 ◽  
Vol 52 (5) ◽  
pp. 1439-1446 ◽  
Author(s):  
A.P. Dhanasopon ◽  
C.S. Levin ◽  
A.M.K. Foudray ◽  
P.D. Olcott ◽  
F. Habte
Keyword(s):  
Gamma Ray ◽  
Design Features ◽  
Scintillation Crystal ◽  
Crystal Design

scholarly journals Can we observe neutrino flares in coincidence with explosive transients?

2017 ◽  
Vol 603 ◽  
pp. A76 ◽  
Author(s):  
Claire Guépin ◽  
Kumiko Kotera
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Photon Flux ◽  
Time Variability ◽  
Tidal Disruption ◽  
Transient Phenomena ◽  
Bolometric Luminosity ◽  
Neutrino Detection ◽  
Transient Sources ◽  
New Generation

The new generation of powerful instruments is reaching sensitivities and temporal resolutions that will allow multi-messenger astronomy of explosive transient phenomena, with high-energy neutrinos as a central figure. We derive general criteria for the detectability of neutrinos from powerful transient sources for given instrument sensitivities. In practice, we provide the minimum photon flux necessary for neutrino detection based on two main observables: the bolometric luminosity and the time variability of the emission. This limit can be compared to the observations in specified wavelengths in order to target the most promising sources for follow-ups. Our criteria can also help distinguishing false associations of neutrino events with a flaring source. We find that relativistic transient sources such as high- and low-luminosity gamma-ray bursts (GRBs), blazar flares, tidal disruption events, and magnetar flares could be observed with IceCube, as they have a good chance to occur within a detectable distance. Of the nonrelativistic transient sources, only luminous supernovae appear as promising candidates. We caution that our criterion should not be directly applied to low-luminosity GRBs and type Ibc supernovae, as these objects could have hosted a choked GRB, leading to neutrino emission without a relevant counterpart radiation. We treat a set of concrete examples and show that several transients, some of which are being monitored by IceCube, are far from meeting the criterion for detectability (e.g., Crab flares or Swift J1644+57).

scholarly journals Optimal configuration of gamma ray machine radiosurgery units: the sphere covering subproblem

2008 ◽  
Vol 3 (1) ◽  
pp. 109-121 ◽  
Author(s):  
Leo Liberti ◽  
Nelson Maculan ◽  
Yue Zhang
Keyword(s):  
Gamma Ray ◽  
Optimal Configuration ◽  
Sphere Covering

Search for point sources of high-energy cosmic gamma rays

1968 ◽  
Vol 46 (10) ◽  
pp. S425-S426 ◽  
Author(s):  
J. P. Delvaille ◽  
P. Albats ◽  
K. I. Greisen ◽  
H. B. Ögelman
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Galactic Disk ◽  
Crab Nebula ◽  
High Energy ◽  
Point Sources ◽  
Photon Flux ◽  
Upper Limits ◽  
Cas A ◽  
The Crab Nebula

A balloon-borne photographic spark chamber was flown at a pressure of 10 g cm−2 on 14 April 1966 from Holloman A.F.B., New Mexico. Upper limits were obtained on gamma-ray fluxes above 1 GeV from various discrete sources including Cyg A, Cas A, and the Crab nebula. Also a measurement was made on the average photon flux above 1 GeV from a portion of the galactic disk.

scholarly journals Investigations of Muon Flux Variations Detected Using Veto Detectors of the Digital Gamma-rays Spectrometer

2021 ◽  
Vol 11 (17) ◽  
pp. 7916
Author(s):  
Krzysztof Gorzkiewicz ◽  
Jerzy W. Mietelski ◽  
Zbigniew Ustrnul ◽  
Piotr Homola ◽  
Renata Kierepko ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Germanium Detector ◽  
Cosmic Ray ◽  
Muon Flux ◽  
Flux Intensity ◽  
Flux Monitoring ◽  
Plastic Scintillators ◽  
Active Shield ◽  
Term Monitoring

This paper presents the results of cosmic ray muons flux monitoring registered by a digital gamma-ray spectrometer’s active shield made of five large plastic scintillators. In traditional, i.e., analogue active shields working in anticoincidence mode with germanium detectors, the generated data are used only as a gating signal and are not stored. However, thanks to digital acquisition applied in designed novel gamma-ray spectrometers enabling offline studies, it has not only become possible to use generated data to reduce the germanium detector background (cosmic rays veto system) but also to initialize long-term monitoring of the muon flux intensity. Furthermore, various analyses methods prove the relevance of the acquired data. Fourier analyses revealed the presence of daily (24 h), near-monthly (27 days) and over bi-monthly (68 days) cycles.

scholarly journals Characteristics of Natural Background Radiation in the Polkowice-Sieroszowice Mine, Poland

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4261
Author(s):  
Katarzyna Szkliniarz ◽  
Agata Walencik-Łata ◽  
Jan Kisiel ◽  
Kinga Polaczek-Grelik ◽  
Karol Jędrzejczak ◽  
...  
Keyword(s):  
Neutron Flux ◽  
Natural Radioactivity ◽  
Radon Concentration ◽  
Gamma Ray ◽  
Background Radiation ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Rock Samples ◽  
Copper Mines ◽  
Flux Measurements

Natural radioactivity in underground locations is the main parameter for the safety of work (occupational hazards) and for the success of experiments in physics or biology requiring unique conditions. The characterization of natural prominence was carried out in the Conceptual Lab development in one of KGHM deep copper mines co-ordinated by KGHM Cuprum R&D. Natural radioactivity studies were performed and included in situ gamma spectrometry, neutron flux measurements, radon concentration, and alpha and gamma laboratory spectrometry measurements of rock samples. At a depth of 1014.4 m (2941.8 m w.e.) within the anhydrite layer, a neutron flux of 2.0 ± 0.2 × 10−6 cm−2 s−1, a gamma-ray dose of 0.008 ± 0.001 μSv/h, a photon flux density of 0.64 ± 0.20 cm−2 s−1, and a radon concentration of 6.6 Bq/m3 were determined. Laboratory analyses of 226,228Ra, 40K, and 238,234U concentrations in collected rock samples showed low values. The exceptionally low level of natural radioactivity in the Polkowice-Sieroszowice mine makes this location a unique place for scientific research.

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