Chronology of Milestone Events in Particle Physics - BOTHE 1929
Chronology of Milestone Events in Particle Physics
  Nobel prize to W. Bothe awarded in 1954 "for his coincidence method and his discoveries made therewith''. Co-winner M. Born "for his fundamental research in quantum mechanics, especially for his statistical interpretation of the wave-function''  

BOTHE 1929

Bothe, W.; Kolhorster, W.;
Das Weßen der Höhenstrahlung / Nature of High-Altitude Radiation
Z. Phys. 56 (1929) 751;

Abstracts
When two Geiger-Müller counting tubes are placed near to one another it is found that, amongst the deflections produced by high altitude radiation, there is a noticeable fraction which take place simultaneously in both tubes. From the way in which these simultaneous deflection depend on the relative positions of the two tubes, and from their large number, it is possible to conclude that each pair is due to the passage of a single corpuscle through both counting tubes. The absorption coefficient of this corpuscular radiation has been determined by placing layers of absorbing material between the two tubes, and measuring the diminution of the number of coincidences. The result obtained is that the corpuscular radiation is just as strongly absorbed as the high-altitude radiation itself. The conclusion is that the high-altitude radiation, as far as it has manifested itself in the phenomena so far observed, is of corpuscular nature. Its probable properties are discussed from this point of view. (Science Abstracts, 1929, 675. H.N.A.).

Accelerator COSM Detectors CNTR, IONIZATION

Related references
See also
H. Geiger and Mueller, Phys.Zeitschr. 29 (1928) 839;
D. V. Skobelzyn, Z. Phys. 54 (1929) 686;
O. Klein and Y. Nishina, Z. Phys. 52 (1928) 853;
R. A. Millikan and G. H. Cameron, Phys. Rev. 31 (1928) 921;

Reactions
  unspec flux
  charged flux

Particles studied
  charged ex

Record comments
Observation that the cosmic rays at sea level consist mainly of ionizing particles.
    
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