The Spin-orbital Structure Of The Nucleon Magnetic

Structure of the nucleon magnetic is as important as, and closely related to, the structure of the nucleon spin. And the spin-orbital structure of nucleon would shed light on the nucleon spin problem.We can from the definition of the magnetic momentum of particles, first we discuss the consistency of the Form-Factor method and the general matrix elements method, then we consider the relation between magnetic momentum and angular momentum, at first we expand all the operators in terms of Dirac spinors, through comparing them we find the relation between them, and we use the more convenient way, which is the spin-orbital separation is obtained by the Gordon decomposition, the total derivative term in the middle we have discarded is that we considered. Some one disagree our viewpoint, so at last we clarified that why this term vanishes identically when one rigorously studies the intrinsic magnetic moment of a particle, either fundamental or composite even we have chosen wave packets instead of plane wave, i.e. a superposition of physical plane-wave states, because they are strictly physical and practical. In a quark model description of the nucleon, however, such time-derivative term might contribute because it is hard to construct a true Hamiltonian eigenstate of relativistic interacting quarks.