Chronology of Milestone Events in Particle Physics - COWAN 1953
Chronology of Milestone Events in Particle Physics

COWAN 1953

Cowan, E.W.; Anderson, C.D.; Leighton, R.B.; Van Lint, V.A.J.;
Cascade Decay of V Particles. II.
Phys. Rev. 92 (1953) 1089 (H4);

Reprinted in
Contributed paper to the APS Meeting, September, 1-5, 1953, Albuquerque.

Full Text
In one of the three cases of the preceding abstracts (ANDERSON 1953B), the positive particle in the V0 decay has a momentum of 880 100 MeV/c, and ionization 1.7 times minimum, determining by counting droplets. This is consistent with a proton but not with a meson, indicating the V0 particle is not of the type that decays into two mesons. The Q value is 39 10 MeV assuming p decay, and 36 10 MeV assuming decay. The latter value is much lower than the usual range of values for decay. It can further be shown, on the assumption of a two-body decay, using only the momenta and included angle of the two decay particles that the observed angular asymmetry about the line of flight of the neutral particle is too great to correspond to a decay into two mesons. The charged secondary of the V- decay has a momentum of 64 10 MeV/c, an estimated ionization of 2-4 times minimum, and is therefore either a or mesons. On the assumption that the V- particle decays into a V10 and a or meson, the best Q value, obtained from 2 of the 3 cases, is 60 15 MeV for a meson and 62 15 MeV for a meson secondary. The calculated mass-values of the charged V particle on these two assumptions are 2570 30 and 2510 30 me, respectively.

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Related references
More (earlier) information appears in
C. D. Anderson, E. W. Cowan et al., Phys. Rev. 92 (1953) 1089H3;
Analyse data from
R. Armenteros et al., Phil. Mag. 43 (1952) 597;

Reactions
  vee p
  charged vee charged

Particles studied
  ex, mass

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