Abstract
A NUMBER of cosmic ray experiments seem to indicate the existence of a non-ionizing penetrating radiation which is capable of producing charged secondaries and showers. Barnóthy and Forró1 have found that at a depth of 800 m. water-equivalent, practically the whole ionization is due to shower particles and not to single ionizing rays. From this fact they concluded that the shower producing radiation must be non-ionizing, and owing to its high penetrating power they proposed to identify it with neutrinos.
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References
Barnóthy and Forró, Z. Phys., 104, 744 (1936).
Maass, Ann. Phys., v, 27, 507 (1936).
Prof. Blackett has kindly pointed out to us that a certain part of this difference may be due to scattering. This question can only be settled by further experiments.
Yukawa, Sakata and Taketani, Proc. Phys. Math. Soc. Japan, 20, 319 (1938). Frohlich, Heitler and Kemmer, Proc. Roy. Soc., A, 166, 154 (1938).
Kemmer, Proc. Camb. Phil. Soc. (in the Press).
Heitler, Proc. Roy. Soc. (in the Press).
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ARLEY, N., HEITLER, W. Neutral Particles in Cosmic Radiation. Nature 142, 158–159 (1938). https://doi.org/10.1038/142158b0
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DOI: https://doi.org/10.1038/142158b0
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