1. The problem statement, all variables and given/known data Write the equations for neutron and proton fusion to form deuterium and for deuterium photodissociation. 2. Relevant equations 3. The attempt at a solution There is plenty on proton-proton fusion to form deuterium, but not much on proton-neutron. Is it simply p + n -> D ? Is deuterium photodissociation D + γ -> p + n ?