Browsing by Autor "Y. Toyoda"
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Item type: Item , Energy spectrum of surviving primary protons with energies(3÷30) TeV at5200 m a.s.l. and the cross-section for proton-air-nucleus collisions(Springer Science+Business Media, 1975) C. Aguirre; A. Trepp; G. R. Mejía; K. Murakami; K. Kamata; Y. Toyoda; Tetsuhiko Maeda; Chiaki Yokoyama; P. K. MacKeown; K. SugaItem type: Item , Searches for Ultra–High‐Energy Gamma Rays from SN 1987A and Centaurus X‐3(IOP Publishing, 1996) H. Yoshii; T. Baba; T. Kaneko; K. Suga; F. Kakimoto; S. Ogio; Y. Shirasaki; N. Gironda; M. Teshima; Y. ToyodaSearches for gamma rays above 100 TeV from SN 1987A and above 50 TeV from Cen X-3 were carried out with an air shower array at Mount Chacaltaya over a period of 3 years. The array, which consists of 13 4 m2 and 28 1 m2 scintillation detectors, was located on a slope of about 30 facing southward to e ectively observe air showers coming from the directions of these sources. In the analysis, a selection by shower age parameter was applied to reduce the background due to showers initiated by protons or nuclei.