Ultra-High Energy γ-Rays from Intergalactic Space
Journal Article
·
· Progress of Theoretical Physics (Kyoto)
The intensity and the energy-spectrum of high-energy gamma rays arising from the collisions of cosmic protons and thermal photons in the intergalactic space are calculated. The calculation gives the result that the ratio of the frequency of extensive air showers initiated by gamma rays to that of cosmic particles is 2 x 10/sup -4/ for shower sizes greater than 10/sup 6/ at mountain altitude and about 10/sup -3/ at sea level. This calculated value is rather small in this size range, but increases with shower size. For example, it reaches a maximum value, about 5 x 10/sup -3/ at mountain altitude and about 10/ sup -2/ at sea level for shower sizes greater than 10/sup 7/. It is emphasized that the result should be examined by observations of extensive air showers of shower size greater than 10/sup 7/, and also that the observations of gamma -ray initiated air showers provide useful means of investigating high energy interactions and cosmology.
- Research Organization:
- Nagoya Univ., Japan
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-039836
- OSTI ID:
- 4650992
- Journal Information:
- Progress of Theoretical Physics (Kyoto), Journal Name: Progress of Theoretical Physics (Kyoto) Journal Issue: 1 Vol. 30; ISSN 0033-068X
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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