neutron

A focus BDD for the AtomicNucleus block

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The neutron is classified as a hadron, because it is a composite particle made of quarks.

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A neutron contains two down quarks with charge −1⁄3 e and one up quark with charge +2⁄3 e.

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The finite size of the neutron and its magnetic moment both indicate that the neutron is a composite, rather than elementary, particle.

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The neutron is classified as a hadron, because it is a composite particle made of quarks. The neutron is also classified as a baryon, because it is composed of three valence quarks.

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The neutron has a magnetic moment, however, so the neutron is influenced by magnetic fields. The neutron's magnetic moment has a negative value, because its orientation is opposite to the neutron's spin.

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The neutron has no measurable electric charge. With its positive electric charge, the proton is directly influenced by electric fields, whereas the neutron is unaffected by electric fields.

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The neutron has a mean square radius of about 0.8×10−15 m, or 0.8 fm, and it is a spin-½ fermion.

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The free neutron has a mass of 939,565,413.3 eV/c2, or 1.674927471×10−27 kg, or 1.00866491588 u.

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Beta decay, in which neutrons decay to protons, or vice versa, is governed by the weak force, and it requires the emission or absorption of electrons and neutrinos, or their antiparticles.

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Neutrons or protons bound in a nucleus can be stable or unstable, however, depending on the nuclide.

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The free proton is stable.

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This radioactive decay, known as beta decay, is possible because the mass of the neutron is slightly greater than the proton.

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A free neutron is unstable, decaying to a proton, electron and antineutrino with a mean lifetime of just under 15 minutes (881.5±1.5 s).

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Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons.

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Protons and neutrons constitute the nuclei of atoms.

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The neutron is a subatomic particle, symbol n or n0, with no electric charge and a mass slightly greater than that of a proton.

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Improved baryon Package Diagram including Nucleon, Proton, Neutron

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Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons

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The quark Package Diagram so far

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An abstract Q(u)ark for M(u)ster M(u)ark

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Some more baryons (and even more baryons)

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Spin-1/2 particles so far

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Neutrons and protons are spin-1/2 fermions and baryons

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Neutron Beam Instruments (NBIs)

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