Minimum energy of antineutrino to produce the reaction
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the solution you quote actually does not conserve momentum yoy can use that p2 is a lorentz invariant and solve (pv +p p )² =(pe +pn)², considering the left hand side in the lab frame and the right hand side in the cm frame you can find ev and check that now momentom is conserved . anyway , as mentioned in the previous line
ev=me+mn-mp is a very good approximation
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