Why pair production is not possible in vacuum?
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The photon must be near a nucleus in order to satisfy conservation of momentum, as an electron-positronpair producing in free space cannot both satisfy conservation of energy and momentum. Because of this, whenpair production occurs, the atomic nucleus receives some recoil.
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The photon must be near a nucleus in order to satisfy conservation of momentum, as an electron-positronpair producing in free space cannot both satisfy conservation of energy and momentum. Because of this, whenpair production occurs, the atomic nucleus receives some recoil.
I hope it's help you
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