In a gas of nucleons, what is the approximate minimum temperature necessary to allow pion production to occur?
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In a high-energy collision between a cosmic-ray particle andaparticle near the top of Earth's atmosphere, 128 km abovesealevel, a pion is created.The pion has a total energy E of 1.81x105 MeV and is traveling vertically downward. Inthepion's rest frame, the pion decays 35.0 ns after its creation.Atwhat altitude above sea level, as measured from Earth'sreferenceframe, does the decay occur? The rest energy of a pion is139.6 MeV.
A kaon K+ (mass = 493.7 MeV/c2) at restdecays intoa pion Ï0 (mass= 135MeV/c2) anda pion Ï+ (mass= 139.6MeV/c2):
A particle known as a pion lives for a short time before breaking apart into other particles. Suppose a pion is moving at a speed of 0.988c, and an observer who is stationary in a laboratory measures the pion's lifetime to be 3.3 x 10-8 s. (a) What is the lifetime according to a hypothetical person who is riding along with the pion? (b) According to this hypothetical person, how far deos the laboratory move before the pion breaks apart?