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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 m_e, respectively.

Accelerator COSM Detectors CLOUD

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

Record comments
Further confirmation of the ^–.

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