Abstract
A VERTICAL counter telescope, designed on the basis of Bhabha's method1, was set up as shown in Fig. 1. 5·25 cm. of lead used in positions II and III together absorb all but the very high-energy electrons. Such high-energy electrons produce showers in the lead in position II and are cut out from being counted by the shower particles tripping the anti-counters 4 or 5 or both. The effect of side showers on this counter telescope is found experimentally to be negligible2. The fact that this arrangement measures the hard component only has also been experimentally verified2.
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References
Bhabha, Proc. Ind. Acad. Sci., A, 19, 23 (1944).
In the course of publication.
Jánossy and Rochester, Proc. Roy. Soc., A, 181, 399 (1943). Rossi and Regener, Phys. Rev., 58, 837 (1940).
See Proc. Roy. Soc., A, 180, 220 (table I) (1942).
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AIYA, S. Banded Meson Spectrum and the Rossi Second Maximum. Nature 153, 375 (1944). https://doi.org/10.1038/153375a0
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DOI: https://doi.org/10.1038/153375a0
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