A joint research team made up of Chinese and Japanese scientists has discovered the highest energy cosmic gamma rays ever observed from an observatory in Tibet, opening a new window to explore the extreme universe.The energy of the gamma rays is as high as 450 TeV, equivalent to 45 billion ...
The observed value, 1460.75 ± 0.06 keV has an uncertainty which is improved by better than an order of magnitude over previous determinations. In addition two gamma rays emitted by natural-occuring thorium have had their energies determined with improved precision: the 727.1 ± 0.1 keV gamma ray...
The observation of the energy spectra of γ-rays and hadrons with energy greater than 2 TeV was carried out at Mt. Fuji (3776 m above sea-level, 650 g·cm 2 atmospheric depth) with a thick Fe emulsion chamber. The results show that there is an appreciable difference between the indices...
Two high altitude balloon flights from Parkes, NSW, have produced evidence for a point source of high energy gamma rays (above 50 MeV) from a point source in Sagittarius. The flights did not confirm the band source of gamma rays reported by Clark, Garmire and Kraushaar last year....
traveling at nearly the speed of light, with the surrounding gas. This causes high-speed shock waves that accelerate electrons to very high energies. These electrons then further scatter the surrounding photons to become high-energy gamma rays. Theoretically, the intensity of this radiation decreases...
energy rangeerrorsgamma radiationgev rangepulsarspulsesWE have already reported the results of a search for pulsed gamma rays ( E γ ≥ 10 13 eV) from four pulsars, CP 0950, CP 1133, AP 1541 and PSR 1642 (ref. 1). We have now studied five other pulsars (NP 0527, NP 0532, CP 0834...
The majority of gamma-ray bursts exhibit a peak in theirνFνphoton energy spectra at an energyEpthat is in the energy range∼20–2000keVof the Large Area Detectors of the Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory. If gamma-ray burst sources are ...
In 1953 Fano warned that for gamma -rays the simple (Bragg) law of combination for a mixture of elements does not hold exactly for the mass energy absorption coefficient if bremsstrahlung generation is appreciable. This comment has been routinely ignored since then, however, causing errors that ...
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It is generally believed that the very high energy (VHE) gamma rays emitted from the Crab Nebula cannot result from the decay of neutral pions which are produced by the collision between relativistic protons, due to the small hadronic cross section and low column density of the nebula. However...