  Magnetic dipole and electric quadrupole moments of the mirror nuclei 8Li and
8B are analysed in the framework of the multiparticle shell model by using two
approaches : i) the one-particle spectroscopic factors and ii) the one-particle
fractional parentage coefficients.
  These two approaches are compared both each to other and with a microscopic
multicluster model. The one-particle nucleon states are calculated taking into
account the continuum by the method of the expansion of the Sturm - Liouville
functions. The experimental magnetic and quadrupole moments of 8Li and 8Bare
reproduced well by using fractional parentage coefficients technique. The root
mean-square radii and the radial density distributions are obtained for these
nuclei.
