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If a Σ- Particle at Rest Decays into a Neutron

Question 26

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If a Σ- particle at rest decays into a neutron and a π- , what is the total kinetic energy of the decay products? The masses of Σ-, neutron, and π- are 1197 MeV/c2, 940 MeV/c2, and 140 MeV/c2, respectively.

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