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An analysis of the nucleon-nucleon force shows the existence of
a tensor component which cannot be explained by the magnetic
dipole moment of nucleons. The regular charge-monopole theory explains
this property of the nuclear force.
Nucleons are spin-1/2 particles. The regular charge-monopole theory
regards all kinds of quarks as Dirac particles which
carry a negative unit of magnetic charge. Thus, using the
electrodynamics of charges analogy, one concludes that
each quark has an axial electric dipole moment.
(This dipole moment is dual to the axial magnetic dipole
moment of the electron's spin.)
Now, the electric field of the axial electric dipole of a spinning
monopole is a part of its bound fields. Therefore,
due to the
main conclusions of the regular charge-monopole theory,
electrically charged particles, like the electron, do not
interact with this field. This outcome explains that,
in spite of the rather large
axial electric dipole moment of quarks, attempts to
measure the electric dipole moment of the neutron
cannot detect it. Hence, the null result of these
measurements pertain to the polar electric
dipole moment of a neutron, which is associated with
parity nonconserving interactions.
Now, a nucleon contains three valence quarks (and the
expectation value of the existence of quark-antiquark pairs
does not vanish) and its overall
spin is 1/2. Thus, it is more than obvious to expect that
the sum of the axial electric dipole moment of the
nucleon's quarks
does not vanish. This axial electric dipole moment of nucleons
is the origin of the nuclear tensor force.
For a more detailed discussion of the
nuclear tensor force and its sign , see the text
beginning at line 4 of p. 94 of the following article:
A Regular Monopole
Theory and Its Application to
Strong Interactions
(Published in Has the Last Word been Said
on Classical Electrodynamics?
(Rinton Press, NJ, 2004)).
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