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A high energy cosmic ray proton hits a proton at rest. What is the minimal amount...

A high energy cosmic ray proton hits a proton at rest. What is the minimal amount of energy the first proton must have to produce a antihelium nucleus? (notice that to produce a antihelium nucleus, the final state must contain 2 neutrons, 2 antineutrons, 2 antiprotons and 4 protons; you can assume that neutrons, protons, and their antiparticles all have mass 1 GeV/c^2 ).

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