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Nuclear density is the density of the nucleus of an atom, averaging about 2.3×10 kg/m. The descriptive term nuclear density is also applied to situations where similarly high densities occur, such as within neutron stars.
The nuclear density of a typical nucleus can be approximately calculated from the size of the nucleus, which itself can be approximated based on the number of protons and neutrons in it. The radius of a typical nucleus, in terms of number of nucleons, is R = A 1 / 3 R 0 {\displaystyle R=A^{1/3}R_{0}} where A {\displaystyle A} is the mass number and R 0 {\displaystyle R_{0}} is 1.25 fm, with typical deviations of up to 0.2 fm from this value. The number density of the nucleus is thus:
The density for any typical nucleus, in terms of mass number, is thus constant, not dependent on A or r, theoretically:
The experimentally determined value for n is 0.16 fm, that is 1.6·10 m.