Statistics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....7..328k&link_type=abstract
In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 7 p 328-331 (SEE N85-35968 24-93)
Statistics
Cores, Cosmic Ray Showers, Electrons, Muons, Particle Interactions, Photomultiplier Tubes, Scintillation Counters, Time Dependence, Trigger Circuits, Charged Particles, Galactic Cosmic Rays, Rates (Per Time)
Scientific paper
Detection of air showers with primary energies above 10 to the 19th power eV with sufficient statistics is extremely important in an astrophysical aspect related to the Greisen cut off and the origin of such high energy cosmic rays. Recently, a method is proposed to observe such giant air showers by measuring the arrival time distributions of air-shower particles at large core distances with a mini array. Experiments to measure the arrival time distributions of muons were started in 1981 and those of electrons in early 1983 in the Akeno air-shower array (930 gcm cm squared atmospheric depth, 900m above sea level). During the time of observation, the detection area of the Akeno array was expanded from 1 sq km to sq km in 1982 and to 20 sq km in 1984. Now the arrival time distribution of electrons and muons can be measured for showers with primary energies above 1019eV at large core distances.
Enoki Toshiaki
Kakimoto Fumio
Nishi Keizo
Suga Kazuharu
Tsuchimoto I.
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