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Neutron drip line is a concept in particle and nuclear physics. An unstable atomic nucleus beyond the neutron drip line will leak free neutrons. In other words, the neutron drip line is the line on the Z, N plane (see chart of nuclides) where the neutron separation energy is zero; the neutron drip line serves as a boundary for neutron-rich nuclear existence. This phenomenon may be contrasted with the proton drip line, as these concepts are similar, but occurring on opposite sides of nuclear stability. In astrophysics, the neutron drip line is important in discussions of nucleosynthesis or neutron stars.

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