Chronology of Milestone Events in Particle Physics - BLACKETT 1933
Chronology of Milestone Events in Particle Physics
  Nobel prize to P. M. S. Blackett awarded in 1948 "for his development of the Wilson cloud chamber method and his discoveries therewith in the field of nuclear physics and cosmic radiation''  

BLACKETT 1933

Blackett, P.M.S.; Occhialini, G.P.S.;
Some Photographs of the Tracks of Penetrating Radiation
Proc. Roy. Soc. A139 (1933) 699;

Summary

1.
A short description is given of a method of making particles of high energy take their own cloud photographs.
2.
The most striking features of some 500 photographs taken by this method are described, and the nature of the showers of particles producing the complex tracks is discussed.
3.
A consideration of the range, ionization, curvature and direction of the particles leads to a confirmation of the view put forward by Anderson that particles must exist with a positive charge but with a mass comparable with that of an electron rather with that of a proton.
4.
The frequency of occurrence of the showers is discussed, and also their possible relation to the bursts of ionization observed by Hoffman, Steinke and others.
5.
The origin of the positive and negative electrons in the showers is discussed, and the conclusion is reached that they are best considered as being created during a collision process.
.

Accelerator COSM Detectors CLOUD, CNTR

Related references
More (earlier) information appears in
P. M. S. Blackett and G. P. S. Occhialini, Nature 130 (1932) 363;
See also
D. V. Skobelzyn, Compt. Ren. 194 (1932) 118;
D. V. Skobelzyn, Compt. Ren. 195 (1932) 315;
C. D. Anderson, Phys. Rev. 41 (1932) 405;
C. D. Anderson, Science 76 (1932) 238;
P. Auger and D. V. Skobelzyn, Compt. Ren. 189 (1929) 55;
B. Rossi, Phys.Zeitschr. 33 (1932) 304;
B. Rossi, Acad. Licei 15 (1932) 734;
Mott-Smith and Locher, Phys. Rev. 38 (1931) 1399;
Mott-Smith and Locher, Phys. Rev. 39 (1932) 883;
T. H. Johnson, W. Fleischer, and J. C. Street, Phys. Rev. 40 (1932) 1048;
L. O. Grounfahl, Phys. Rev. 40 (1932) 635;
Williams and Terroux, Proc. Roy. Soc. A126 (1930) 289;
H. A. Bethe, Z. Phys. 76 (1932) 293;
P. M. S. Blackett, Proc. Roy. Soc. A135 (1932) 132;
R. A. Millikan and C. D. Anderson, Phys. Rev. 40 (1932) 325;
E. Steinke and Schindler, Z. Phys. 75 (1932) 115;
E. Steinke and Schindler, Naturw. 20 (1932) 491;
Messerschmidt, Z. Phys. 78 (1932) 668;
D. D. Iwanenko, Physik Zeits. Sow. 1 (1932) 820;
Mandel, Physik Zeits. Sow. 2 (1932) 286;
F. Perrin, Compt. Ren. 195 (1932) 236;
W. Heisenberg, Z. Phys. 77 (1932) 1;
W. Heisenberg, Annalen der Physik. Leipzig 13 (1932) 430;
W. Heisenberg, Naturw. 21 (1932) 365;
N. Bohr, Report of Congress in Rome (1931);
C. T. R. Wilson, Proc. Camb. Phil. Soc. 22 (1925) 534;
P. A. M. Dirac, Proc. Roy. Soc. A126 (1930) 360;
P. A. M. Dirac, Proc. Roy. Soc. A133 (1931) 60;
P. A. M. Dirac, Proc. Camb. Phil. Soc. 26 (1930) 361;
C. T. R. Wilson, Proc. Phys. Soc. 31 (1925) 32D;
H. Weil, Gruppentheorie und Quantenmechanik 2nd ed., (1931) 234;
E. Rutherford, J. Chadwick, and Ellis, Radiation from Radioactive Substances 443;
C. Y. Chao, Phys. Rev. 36 (1930) 1519;
L. Meitner and Hupfield, Naturw. 19 (1931) 775;
Gray and Tarrant, Proc. Roy. Soc. A136 (1932) 662;
J. Chadwick, Proc. Roy. Soc. A136 (1932) 692;
D. V. Skobelzyn, Z. Phys. 54 (1929) 686;

Reactions
  unspec nucleus shower X
  unspec nucleus e– e+ X

Particles studied
  e+ ex, mass, qn

Record comments
e+ and shower confirmation. First indication for e+ e– pair production.
    
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