  An analysis of the Dirac neutrino magnetic moment with standard model
interactions gives $\mu_\nu\sim 3 \times 10^{-19} \mu_B (m_\nu/1 eV)$. The
observation of a significantly larger magnetic moment will provide a clear
signal of new physics beyond the standard model. The current experimental
limits on the neutrino magnetic moments are orders of magnitude larger than the
prediction with the standard model interactions and thus its test appears out
of reach. Here we give an analysis of the Dirac neutrino magnetic moments
within the framework of a minimal supersymmetric standard model extension with
a vectorlike lepton generation. Specifically we compute the moments arising
from the exchange of W and the charged leptons in the loop, as well as from the
exchange of charginos, charged sleptons and charged mirror sleptons. It is
shown that the neutrino moment in this case can be several orders of magnitude
larger than the one with standard model like interactions, lying close to and
below the current experimental upper limits and should be accessible in
improved future experiment. A correlated prediction of the heaviest neutrino
lifetimes from radiative decays to the lighter neutrinos via exchange of
charginos and sleptons in the loops is also made. The predicted lifetimes are
several orders of magnitudes smaller than the one with the standard model
interactions and also lie close to the current experimental limits from
analyses using the cosmic background neutrino data.
