Abstract
AN investigation has been carried out in which extensive showers selected by a fourfold array of Geiger – Müller counters (each of area ˜ 200 cm.2) were used to trigger a cloud chamber of collecting area about 70 cm.2. In addition, the operation of a large single counter tray (area ˜ 720 cm.2), shielded by 15 cm. lead on the top (or in part of the work with 16 cm. iron + 10 cm. lead) and surrounded by 8 cm. lead on all sides, in coincidence with the fourfold array was recorded on the chamber photographs by means of an indicator lamp. Thus a density sample of the showers was obtained in the chamber and the probability of the operation of the shielded tray was studied as a function of the number of shower tracks in the corresponding photographs.
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References
Janossy and Broadbent, Proc. Roy. Soc., A, 192, 364 (1948).
Cocconi, Phys. Rev., 70, 841, 852 (1946).
Daudin, Ann. de Phys., 18, 145, 217 (1943).
Clay, Physica, 9, 897 (1943).
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CHAUDHURI, B. Extensive Penetrating Showers. Nature 161, 680 (1948). https://doi.org/10.1038/161680a0
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DOI: https://doi.org/10.1038/161680a0
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