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PONTECORVO 1959

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.

Abstracts
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 (ν_e and anti-ν_e) and muon pair (ν_μ and anti-ν_μ)).
To solve the fundamental question whether ν_μ and ν_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 K^o and anti-K^o mesons. In principle the problem can be solved if it is demonstrated experimentally that a anti-ν_μ beam is capable of inducing transitions which anti-ν_e particle can certainly induce (e.g. the anti-ν_μ 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;