Geodesic
Neutral Fermion with a Magnetic Moment in External Electromagnetic Fields
Teoretičeskaâ i matematičeskaâ fizika, Tome 126 (2001) no. 3, pp. 427-442 Cet article a éte moissonné depuis la source Math-Net.Ru

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The interaction between a massive neutral fermion with a static (spin) magnetic dipole moment $\mu$ and an external electromagnetic field is described by the Dirac–Pauli equation. Exact solutions of this equation are obtained along with the corresponding energy spectrum for an axially symmetric external magnetic field and for some centrally symmetric electric fields. It is shown that the spin?orbital interaction of a neutral fermion with a magnetic moment determines both the characteristic properties of the quantum states and the fermion energy spectrum. It is found that (1) the discrete energy spectrum of a neutral fermion depends on the projection of the fermion spin on a certain quantization axis, (2) the ground energy level of a fermion in these electric fields as well as the energy levels of all bound states with a fixed value of the quantum number characterizing the projection of the fermion spin in the electric field $E=er$ is degenerate and the degeneration order is countably infinite, and (3) the energy spectra of neutral fermions and antifermions with spin magnetic moments are symmetric in centrally symmetric fields. Bound states of a neutral fermion with a magnetic moment in an external electric field do exist even if the Dirac–Pauli equation does not explicitly contain the term with the fermion mass. In addition, in centrally symmetric electric fields, there exist a countably infinite set of pairs of isolated charge-conjugate zero-energy solutions of the Dirac–Pauli equation. 
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     title = {Neutral {Fermion} with a {Magnetic} {Moment} in {External} {Electromagnetic} {Fields}},
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V. R. Khalilov. Neutral Fermion with a Magnetic Moment in External Electromagnetic Fields. Teoretičeskaâ i matematičeskaâ fizika, Tome 126 (2001) no. 3, pp. 427-442. http://geodesic.mathdoc.fr/item/TMF_2001_126_3_a4/

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