| Nuclear physics |
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High-energy processes |
Nuclear matter is an idealized system of interacting nucleons (protons andneutrons) that exists in severalphases ofexotic matter that, as of yet, are not fully established.[2] It isnot matter in anatomic nucleus, but a hypothetical substance consisting of a huge number of protons and neutrons held together by onlynuclear forces andnoCoulomb forces.[3][4] Volume and the number of particles are infinite, but the ratio is finite.[5] Infinite volume implies no surface effects and translational invariance (only differences in position matter, not absolute positions).
A common idealization issymmetric nuclear matter, which consists of equal numbers of protons and neutrons, with noelectrons.
When nuclear matter is compressed to sufficiently high density, it is expected, on the basis of theasymptotic freedom ofquantum chromodynamics, that it will becomequark matter, which is a degenerateFermi gas of quarks.[6]
Some authors use "nuclear matter" in a broader sense, and refer to the model described above as "infinite nuclear matter",[1] and consider it as a "toy model", a testing ground for analytical techniques.[8] However, the composition of aneutron star, which requires more than neutrons and protons, is not necessarily locally charge neutral, and does not exhibit translation invariance, often is differently referred to, for example, asneutron star matter orstellar matter and is considered distinct from nuclear matter.[9][10] In a neutron star, pressure rises from zero (at the surface) to an unknown large value in the center.
Methods capable of treating finite regions have been applied to stars and to atomic nuclei.[11][12] One such model for finite nuclei is theliquid drop model, which includes surface effects and Coulomb interactions.
