We report the detection of gamma rays--tracers of such cosmic rays--from the starburst galaxy NGC 253 using the High Energy Stereoscopic System (H.E.S.S.) array of imaging atmospheric Cherenkov telescopes. The gamma-ray flux above 220 billion electron volts is F = (5.5 卤 1.0star 卤 ...
The plastic scintillating fiber of Bicron model BCF-12 with an emission peak of 435nm has been used to detect 137Cs gamma rays. Several types of sensors were constructed by packing in bundle forms different numbers of fibers into aluminum tubes,and tested to detect the gamma rays. The ...
Gamma rays with energies greater than 7 TeV from the Crab pulsar/nebula have been observed at large zenith angles, using the Imaging Atmospheric Technique from Woomera, South Australia. CANGAROO data taken in 1992, 1993 and 1995 indicate that the energy spectrum extends up to at least 50 TeV...
The authors report the first measurement of high-energy gamma rays with a low-temperature calorimeter. The detector is a crystal of about 10.7 gm operated at a temperature of about 30 mK. The thermal pulses produced by gamma rays are detected and measured by a thermistor in thermal contact wi...
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Indeed, some features in the optical-UV spectrum seem to indicate the presence of Seyfert-like components, such as the little blue bump and the big blue bump. 展开 关键词: gamma-rays: observations radiation mechanisms: non-thermal quasars: individual: PKS 1510-089 ...
A.systeme of detection of neutrons and or of the gamma rays having a large surface of the reception of the radiation to which we shall now describe the product of the photons in the drawings, which produces a scintillation photons which are captured in the optical fibers forming the driver....
Cosmic rays and gamma radiation from the shell of SN1987A Detection of high-energy gamma rays from young supernovae shells 1,2 can directly prove the hypothesis that the main sources of cosmic rays (CR) in our Ga... VS Berezinsky,VL Ginzburg - 《Nature》 被引量: 83发表: 1987年 Detec...
Terrestrial gamma-ray flashes are thought to be bremsstrahlung gamma-rays, produced at the top of thunderclouds by avalanches of electrons accelerated within thunderstorm strong electric fields and abruptly braked in the atmosphere. Exhibiting energies ranging from few keV up to several tens of MeV, ...
The imaging gamma-ray telescope COMPTEL, capable of detecting gamma rays in the 1 to 30 MeV range, is one of four experiments onboard NASA's Gamma-Ray Observatory GRO. Besides its primary objectives COMPTEL will contribute to the understanding of cosmic gamma-ray bursts. Summarising, COMPTEL lo...