# Why don't alpha particles have magnetic moments?

As I understand, particles such as the neutron, whilst having no external charge still possess a magnetic moment due to the underlying charges of its components.

By that logic why does the alpha particle have a magnetic moment of zero?

Four nucleons comprising all four allowed $\text{spin} \times \text{isospin}$ states can all be expected to be in the s1 state so that they have no orbital contribution and for each pair the intrinsic magnetic moments cancel as the spins are opposed. Boom. Zero and done.
• a more interesting question is how the spherical symmetry in the ground state of the $He_4$ nucleus is determinant for the degeneracy observed in the Bose-Einstein condensate, and why similarly symmetric nuclei do not show the condensate transition – lurscher Jan 25 '13 at 19:59