Chronology of Milestone Events in Particle Physics - PONTECORVO 1959
Chronology of Milestone Events in Particle Physics


Pontecorvo, B.;
Electron and Muon Neutrinos
Zh. Eksp. Teor. Fiz. 37 (1959) 1751; JETP 10 (1960) 1236;

Reprinted in
Bruno Pontecorvo, Izbrannye trudy, ed. S. M. Bilenkii, Moskva, <> (1997) t.I, s.191.

Some processes due to free neutrinos which heretofore had not been considered are discussed. Especial attention is payied to those processes which in principle may help to solve the problem concerning the existence of two neutral lepton pairs (electron pair (e and e) and muon pair ( and )).
To solve the fundamental question whether and e are identical particles, a method is proposed which in essence is analogous to the method employed for solving the problem of the distinguishability of the neutrino and antineutrino or Ko and o mesons. In principle the problem can be solved if it is demonstrated experimentally that a beam is capable of inducing transitions which e particle can certainly induce (e.g. the p n e+ reaction).
The experiment suggested above although difficult, should be feasible with accelerators capable of producing more intense beams than those produced by present day accelerators.

Related references
See also
S. Sakata, Progr. of Theor. Phys. 16 (1953) 686;
B. Pontecorvo, Zh. Eksp. Teor. Fiz. 33 (1957) 549;
B. Pontecorvo, Chalk River Laboratory Report PD-205 (1946);
D. Berley, J. Lee, and M. Bardon, Phys. Rev. Lett. 2 (1959) 357;
G. Feinberg, Phys. Rev. 110 (1958) 1482;
S. Oneda and J. C. Pati, Phys. Rev. Lett. 2 (1959) 125;
L. W. Alvarez, UCRL-328 (1949);
H. A. Bethe and R. Pierls, Nature 133 (1934) 532;
B. Pontecorvo, Zh. Eksp. Teor. Fiz. 36 (1959) 1615;
L. B. Okun', Zh. Eksp. Teor. Fiz. 34 (1958) 469;
R. P. Feynman and M. Gell-Mann, Phys. Rev. 109 (1958) 193;
A. G. Cameron, Ann. Rev. Nucl. Sci. 8 (1958) 1;
Analyse data from
M. P. Balandin et al., Zh. Eksp. Teor. Fiz. 29 (1955) 265;
M. Goldhaber, L. Grodzins, and A. W. Sunyar, Phys. Rev. 109 (1958) 1015;
W. A. Love et al., Phys. Rev. Lett. 2 (1959) 107;
R. Davis, Phys. Rev. 86 (1952) 976;
F. Reines and C. L. Cowan, Phys. Rev. 113 (1959) 273;
F. Reines and C. L. Cowan, Phys. Rev. 90 (1953) 492;

Particles studied
  e qn
  e qn

Record comments
Proposed experiments to establish distinguishability of e and . Indication on the feasibility of neutrino beams with accelerators.
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