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A K° meson (mass 497.61 MeV/c?) decays to a n+, 7- pair with a mean lifetime of 0.89 x
10-10 s. Suppose the Kº has a kinetic energy of 276 MeV when it decays, and that the two
a mesons emerge at equal angles to the original K° direction.
Calculate the kinetic energy of each a meson and the opening angle between them. The
mass of a a meson is 139.57 MeV/c?.

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