Packing fraction

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Packing fraction
Obsolete Mass defect of an atom divided by its mass number and expressed as parts per 10,000.
Related Term(s): mass defect

F. W. Aston, "Atoms and Their Packing Fractions" Nature 120, 956 (1927),

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"The most convenient and informative expression for the divergences of an atom from the whole number rule is the actual divergence divided by its mass number. This is the mean gain or loss per proton when the nuclear packing is changed from that of oxygen to that of the atom in question. It will be called the packing fraction of the atom and expressed in parts per 10,000."
"In 1927 Aston published his measurements of the deviations of the nuclidic weights from integers in the form of a packing fraction curve that reflects the variation of the binding energy per nucleon with the number A of nucleons in the various nuclides."

Mass defect

Mass defect in mass spectrometry and nuclear physics

Mass defect (mass spectrometry)
The difference between the exact mass and the nearest integer mass
Mass defect (physics)
The difference between the mass of a composite particle and the sum of the masses of its parts


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Zhang (2003); A software filter to remove interference ions from drug metabolites in accurate mass liquid chromatography/mass spectrometric analyses
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Pourshahian (2017); Mass Defect from Nuclear Physics to Mass Spectral Analysis