Chronology of Milestone Events in Particle Physics - CHADWICK 1932B
Chronology of Milestone Events in Particle Physics

  Nobel prize to J. Chadwick awarded in 1935 "for his discovery of the neutron''  


Chadwick, J.;
The Existence of a Neutron
Proc. Roy. Soc. A136 (1932) 692;

Reprinted in
Great Experiments in Physics ed. M. H. Shamos, Henry Holt and Company, New York (1960).
Classical Scientific Papers. Physics. Facsimile reproductions of famous scientific papers. Mills and Boon Limited, London (1964) 246.

The properties of the penetrating radiation emitted from beryllium (and boron) when bombarded by the -particles of polonium have been examined. It is concluded that the radiation consists, not of quanta as hitherto supposed, but of neutrons, particles of mass 1, and charge 0. Evidence is given to show that the mass of the neutron is probably between 1.005 and 1.008. This suggests that the neutron consists of a proton and an electron in close combination, the binding energy being about 1 to 2 x 106 electron volts. From experiments on the passage of the neutrons through matter the frequency of their collisions with atomic nuclei and with electrons is discussed.

Accelerator SOURCE Detectors CLOUD, CNTR

Related references
More (earlier) information appears in
J. Chadwick, J. E. R. Constable, and E. C. Pollard, Proc. Roy. Soc. A130 (1930) 463;
J. Chadwick, Nature 129 (1932) 312;
See also
G. Gamow and Houtermans, Z. Phys. 52 (1928) 453;
I. Curie and F. Joliot, Compt. Ren. 194 (1932) 273;
I. Curie and F. Joliot, Compt. Ren. 194 (1932) 876;
I. Curie and F. Joliot, Compt. Ren. 194 (1932) 708;
Jenkins and McKellar, Phys. Rev. 39 (1932) 549;
I. Curie, Compt. Ren. 193 (1931) 1412;
J. K. Roberts, Proc. Roy. Soc. A102 (1922) 72;
J. L. Glasson, Phil. Mag. 42 (1921) 596;
F. Rasetti, Naturw. 20 (1932) 252;
P. Auger, Compt. Ren. 194 (1932) 877;
Massey, Nature 129 (1932) 691;
Massey, Nature 129 (1932) 469;
E. Rutherford, Proc. Roy. Soc. A97 (1920) 374;
W. Bothe and H. Becker, Z. Phys. 66 (1930) 289;
D. L. Webster, Proc. Roy. Soc. A136 (1932) 428;

  He Be nucleus n
  n p p n

Particles studied
  n ex, mass, qn

Record comments
Discovery of the neutron.
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