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Mass Excess

Applicable units are those of quantitykind:Mass

The "Mass Excess" of a nuclide is the difference between its actual mass and its mass number in atomic mass units. It is one of the predominant methods for tabulating nuclear mass.

http://en.wikipedia.org/wiki/Mass_excess

http://www.iso.org/iso/catalogue_detail?csnumber=31895

$\Delta = m_a - Am_u$, where $m_a$ is the rest mass of the atom, $A$ is its nucleon number, and $m_u$ is the unified atomic mass constant.

$\Delta$

The "Mass Excess" of a nuclide is the difference between its actual mass and its mass number in atomic mass units. It is one of the predominant methods for tabulating nuclear mass.