Nuclear halo

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In nuclear physics, an atomic nucleus is said to be a halo if its radius is appreciably larger than that predicted by the liquid drop model, wherein the nucleus is assumed to be a sphere of constant density. For a nucleus of mass number A, the radius r is(approximately):

r = r_\circ A^{\frac{1}{3}}

Where r_\circ is 1.2 fm. Examples of nuclei which are known to exhibit neutron halos are: 6He, 8He, 11Li, 11Be, 14Be, 17B and 19C.

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