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8th Latin American Symposium on Nuclear Physics and Applications, Santiago, Chile, 15 - 19 December 2009, vol.1265, pp.31-32
The use of nuclear masses to elucidate structure and its evolution with Z and N is discussed, with emphasis on two-neutron separation energies and the proton-neutron interaction as extracted from double differences of binding energies. The enhanced sensitivity of masses to structure in deformed nuclei is also discussed.