Why does a strong magnetic field disrupt the nucleus? The quarks cannot be magnetic monopoles because they carry electric charge. The quarks are confined in a duel superconductive vacuum formed by 'magnetic charges"
http://arxiv.org/pdf/1008.1055v2.pdf *Superconductivity of QCD vacuum in strong magnetic field* *We show that in a sufficiently strong magnetic field the QCD vacuum may undergo a transition to a new phase where charged mesons are condensed. In this phase the vacuum behaves as an anisotropic inhomogeneous superconductor which supports superconductivity along the axis of the magnetic field. In the directions transverse to the magnetic field the superconductivity is absent. The magnetic field-induced anisotropic superconductivity { which is realized in the cold vacuum, i.e. at zero temperature and density { is a consequence of a non-minimal coupling of the p mesons to the electromagnetic field. The onset of the superconductivity of the charged p mesons should also induce an inhomogeneous superfuidity of the neutral p0 mesons. We also argue that due to simple kinematical reasons a strong enough magnetic field makes the lifetime of the p mesons longer by closing the main channels of the strong decays of the p mesons into charged pions. * In other words, in a strong enough magnetic field, pions will condense out of the vacuum and disrupt the nucleus. *Also, this effect generates an electric current of quarks along the magnetic field axis provided the densities of left- and right-handed quarks are not equal. In the cold matter the external magnetic field may create spatially inhomogeneous structures which are made of quark condensates*.
