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QUDT VOCAB Quantity Kinds Release 2.1.25
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quantitykind:MassExcess
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http://qudt.org/vocab/quantitykind/MassExcess
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Mass Excess
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http://en.wikipedia.org/wiki/Mass_excess
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http://www.iso.org/iso/catalogue_detail?csnumber=31895
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\(\Delta = m_a - Am_u\), where \(m_a\) is the rest mass of the atom, \(A\) is its nucleon number, and \(m_u\) is the unified atomic mass constant.
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\(\Delta\)
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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.