The main ring of the tevatron proton-antiproton collider at fermilab has a maximum beam energy of 1 tev. when it collides protons onto counter circulating antiprotons of the same beam energy, the center-of-mass energy vs 2 tev. if instead the tevatron collides antiprotons onto protons at rest, vs 43 gev, which is significantly less [3 points] what would the beam energy need to be for the fixed target collisions to reach the same center-of-mass energy as the symmetric tevatron collider? a. b. 3 points] what is the minimum proton beam energy required in order to produce an extra proton-antiproton pair in a fixed target collision with another proton?