Chronology of Milestone Events in Particle Physics - STÜCKELBERG 1938
Chronology of Milestone Events in Particle Physics

STÜCKELBERG 1938

Stückelberg, E.C.G.;
Die Wechselwirkunskräfte in der Elektrodynamik und in der Feldtheorie der Kernkräfte (Teil II und III) / Interaction in Electrodynamics and in the Field Theory of Nuclear Forces (Part II and III)
Helv. Phys. Acta 11 (1938) 299;

Quotation
"Apart from ... the conservation law of electricity there exists evidently a further conservation law: No transmutations of heavy particles (neutron and proton) into light particles (electron and neutrino) have yet been observed in any transformation of matter. We shall therefore demand a conservation law of heavy charge.'' (Quotation is taken from A. Pais, Inward Bound of the Matter and Forces in the Particle World, Clarendon Press Oxford. Oxford University Press New York, 1988).

Related references
More (earlier) information appears in
H. Weyl, Z. Phys. 56 (1929) 330;
More (later) information appears in
E. P. Wigner, Proc. Am. Phil. Soc. 93, 521 (1949);

Record comments
Invention of the baryonic quantum number conservation law.
    
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