Why is the reaction d n n 0 effectively forbidden for a at rest, but proceeds at a normal rate for a strong reaction at higher energies

Question: Why is the reaction + d n + n + 0 effectively forbidden for a at rest, but proceeds

Why is the reaction π⁻ + d → n + n + π⁰ effectively forbidden for a π⁻ at rest, but proceeds at a normal rate for a strong reaction at higher energies?

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