packing fraction

noun
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.

Origin:
1925–30

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World English Dictionary
packing fraction
 
n
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

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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.


The American Heritage® Science Dictionary
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Example sentences
Shortening the beam tube lengths to their acceptable minimum to improve the packing fraction.
In general, the efficiency and resistance both increase as the fiber diameter decreases or packing fraction increases.
The well-known spatial variation of packing fraction near the outer boundary of a pebble-bed reactor core is cited.
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