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In: Physics

Show that the creation of an electron-positron pair by a single photon is not possible in...

Show that the creation of an electron-positron pair by a single photon is not possible in isolation. i e that additional mass or ( radiation) must be present. ( hint: Consider the reaction at threshold, then apply conservation laws)

Note: need to show that the additional mass conserves energy and momentum, NOT that the absence of additional mass does not conserve energy and momentum

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