When a proton and an antiproton collide
A) they destroy each other and produce energy in the form of gamma rays.
B) one of the protons is converted to a neutron and they form nucleus of one proton and one neutron.
C) one of the protons is converted to an electron and they form a hydrogen atom.
D) one proton is converted to a neutron and the other is converted to an electron.
E) A proton and an antiproton can not collide because the Coulomb barrier is too great.
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