<P> The neutron is a spin 1 / 2 particle, that is, it is a fermion with intrinsic angular momentum equal to 1 / 2 ħ, where ħ is the reduced Planck constant . For many years after the discovery of the neutron, its exact spin was ambiguous . Although it was assumed to be a spin 1 / 2 Dirac particle, the possibility that the neutron was a spin 3 / 2 particle lingered . The interactions of the neutron's magnetic moment with an external magnetic field were exploited to finally determine the spin of the neutron . In 1949, Hughes and Burgy measured neutrons reflected from a ferromagnetic mirror and found that the angular distribution of the reflections was consistent with spin 1 / 2 . In 1954, Sherwood, Stephenson, and Bernstein employed neutrons in a Stern--Gerlach experiment that used a magnetic field to separate the neutron spin states . They recorded two such spin states, consistent with a spin 1 / 2 particle . </P> <P> As a fermion, the neutron is subject to the Pauli exclusion principle; two neutrons cannot have the same quantum numbers . This is the source of the degeneracy pressure which makes neutron stars possible . </P> <P> An article published in 2007 featuring a model - independent analysis concluded that the neutron has a negatively charged exterior, a positively charged middle, and a negative core . In a simplified classical view, the negative "skin" of the neutron assists it to be attracted to the protons with which it interacts in the nucleus . (However, the main attraction between neutrons and protons is via the nuclear force, which does not involve electric charge .) </P> <P> The simplified classical view of the neutron's charge distribution also "explains" the fact that the neutron magnetic dipole points in the opposite direction from its spin angular momentum vector (as compared to the proton). This gives the neutron, in effect, a magnetic moment which resembles a negatively charged particle . This can be reconciled classically with a neutral neutron composed of a charge distribution in which the negative sub-parts of the neutron have a larger average radius of distribution, and therefore contribute more to the particle's magnetic dipole moment, than do the positive parts that are, on average, nearer the core . </P>

What kind of charge does the neutron have
find me the text answering this question