SU(2) Symmetry and Degeneracy From SUSY QM of a Neutron in the Magnetic   Field of a Linear Current
  From SUSY ladder operators in momentum space of a neutron in the magnetic field of a linear current, we construct $2\times 2$ matrix operators that together with the z-component of the angular momentum satisfy the su(2) Lie algebra. We use this fact to explain the degeneracy of the energy spectrum. 
D. Martinez, V. D. Granados and R. D. Mota