= Nuclear level reconstruction from energy differences
{title2=$E_{\gamma,i}=E_{u_i}-E_{l_i}$}
Reconstructing a nuclear gamma scheme amounts to assigning measured <photon> energies to differences between ordered level energies. Cascade <energy> sums constrain the graph, while population-flow balances constrain its orientation and feeding. Experimental central energies need not close exactly; a weighted least-squares energy-network fit uses their uncertainties consistently. Multiple graphs can satisfy the same spectrum when coincidence or lifetime information is absent.
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