Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2481a&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
It has been generally believed that galactic cosmic rays with the energy of less than at least 100 TeV are accelerated in shell-type supernova remnants (SNRs). If SNRs are the site of cosmic-ray acceleration, the associated nuclear interactions should result in a detectable flux of gamma-rays for nearby SNRs. The Tibet air-shower array has been much improved because the detectors have increased in number by sixty percent in 1999. A search for continuous multi-TeV gamma-ray emission from nearby sixteen shell-type SNRs has been performed with the improved air-shower array (the Tibet III array). These SNRs are located within 5 kpc distance in the declination band of 0° to +60° . No significant emission has been detected and flux upper limits are set for each of these SNRs. The results piled up the data of six Correspondence to: T.Utsugi (toshi@cr.phy.saitama-u.ac.jp) nearby SNRs located within 2 kpc distance impose restrictions on the model of shock acceleration of cosmic rays.
Amenomori Michihiro
Ayabe S.
Cui Shu-Wen
Ding Lin-Kai
Ding Xue-Yong
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