Question: Two possible nuclear fusion reactions are d + d 4 He + and d + d 4 He + p , where

Two possible nuclear fusion reactions are d + d → ⁴He + γ and d + d → ⁴He + p , where d is deuterium, an atom with a nucleus composed of a proton bound to a neutron. ³He and ⁴He are helium atoms with nuclei consisting of two protons and one neutron (³He) or two protons and two neutrons (⁴He). Both of these reactions satisfy energy conservation. Which do you think occurs more quickly and why?

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