Abstract
The high energy nuclear active particles (NAP) of more then 200 GeV, associated with EAS, have been studied by means of the large area scintillation detectors under water tank, at the mountain altitude of 2770 m a.s.l. We have obtained the following results; (1) The energy spectrum of NAP has a knee at about 500 GeV where the spectrum index changes from -1.0 to -1.8, (2) The lateral distribution of NAP can be expressed as A exp (- r / r 0 ) with r 0 of 1∼2 m, (3) The number of NAP is much smaller than the results of the Monte Calro simulations assuming the ordinary interaction model, and (4) The mean transverse momentum of NAP is about 2 GeV/c which is much higher than generally accepted value in the nuclear interactions.
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