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Cosmic Radiation and Elementary Particles 291

and
not conserved; s=spin quantum number.
and all nuclei. *K-

(s); decay mode p+e-+G, ~

Life time 889; - stable 2x106; - e-+v,+v,, stable stable stable to 1673 MeV for R-, and lifetimes = lo-" s).

in nuclide raactions (u) 1.008665 1.007276 0.113366 O.OOO5486 o? 0 of parity and parity sign; P-no=parity See also Table 10.2.

particles" Rest mass with m, 1116 for A'

"elementary (MeV) 939.6 938.3 105.6 0.5110 o? 0 is 135.0 MeV.

TABLE 10.1, Cornman Symbol n P P- e vp ve. A-yes=baryon number am.wvd, Pf=conservation All these particles have their anti-particles, except for the photon and mesons, which are their own anti-particles. and p). hyperons (also called "strangebaryons", no rest mass

Name neutron proton muon electron neutrino

(n x+ decay into corresponding anti-particles in a similar way.

W, W. S=Strong interdon; W=Weak hdon; tBaryonsincludethenncleons

Class Baryonst (nucleons): S, A-Y~, s=% P+. Mesons: S. P-, A-no. s=o Leptons++? A-no, P-no, s=% Photon: A-no, P-no. s= 1