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" ... Cosmic ray shower and some of the possible interactions. Note that if a charged pion (left) strikes ... [+] a nucleus before it decays, it produces a shower, but if it decays first (right), it produces a muon that will have a chance to reach the surface. Many of the 'daughter' particles produced by cosmic rays include neutrons, which can convert nitrogen-14 into carbon-14. ... "
" ... Cosmic ray shower and some of the possible interactions. Note that if a charged pion (left) strikes... [+] a nucleus before it decays, it produces a shower, but if it decays first (right), it produces a muon that will reach the surface. Many of the 'daughter' particles produced by cosmic rays include neutrons, which can convert nitrogen-14 into carbon-14. ... "
" ... Not quite. While you can’t have a pure “red-antired” or “green-antigreen,” you can have a mixed state that’s part red-antired, part green-antigreen, and even part blue-antiblue. This is because, in quantum physics, particles (or particle combinations) with the same quantum states all mix together; it’s unavoidable. Just as the neutral pion is a combination of up-antiup and down-antidown quarks, the other allowable gluons are combinations of red-antired, green-antigreen, and blue-antiblue. ... "
" ... When a proton or neutron collides with a high-energy photon, it can produce a pion through a (real ... [+] or virtual) Delta resonance. Pion production can only occur if there's enough available energy via Einstein's E = mc^2, which should limit the energy of cosmic rays to a specific value. Observationally, however, we see that these limits are exceeded. ... "