Atomic Masses in the Heavy Mass Region

A six-inch double-focusing mass spectrometer has been employed to determine 61 mass doublets in the region of gadolinium to gold. The present results and other Minnesota mass data have been combined with nuclear reaction, $\beta$-decay, and $\alpha$-decay energies in order to construct a mass table for more than 200 stable and radioactive isotopes in the region from samarium to radon. Total atomic binding energies as well as nucleon separation and pairing energies have been computed, wherever possible.