An analysis is presented of the soft component arising from a high energy nuclear shower ({~}3×{}10¹³ ev) observed in stripped emulsion. The chief results obtained are: (1) The production ratio of neutral π mesons to charged shower particles is 0.50±{}0.11; (2) the lifetime of the neutral π meson is found to be (1_-0.5⁺¹) ×{} 10^-14 sec; (3) the mean free path for direct electron pair production by high-energy electrons is found to be 4.4 and 1.1 radiation units for electrons in the energy intervals 1 to 10 Bev and 10 to 100 Bev, respectively.
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Koshiba et al. (1955) studied this question.
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