packing fraction

Physics. a measure of the stability of an atomic nucleus, equal to 10 4 multiplied by the mass defect and divided by the mass number.

1925–30 Unabridged
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World English Dictionary
packing fraction
a measure of the stability of a nucleus, equal to the difference between its mass in amu and its mass number, divided by the mass number

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
packing fraction   (pāk'ĭng)  Pronunciation Key 
  1. The ratio of the total volume of a set of objects packed into a space to the volume of that space.

  2. The difference between the isotopic mass of a nuclide and its mass number, divided by its mass number. The packing fraction is often interpreted as a measure of the stability of the nucleus.

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