Abstract
By analysing the size-frequenq, distributions of large cosmic ray bursts obtained at three stations by SRI ion chambers, it is concluded that: a) about 40% of the total bursts at sea level are those induced by N-rays, and the portion of them decreases with increasing size, b) apsorption mean free path of burst-producing N-rays is 120 g/cm2 in air, and decreases with increasing size, approaching to collision mean free path of air. Moreover, from the comparison of our results with others, it is shown that the absorption mean free path of burst-producing N -rays near sea level is not same as that at high altitude, but it elongates near sea level. Some discussions on burst production are presented in connection with our results.
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