  A process, involving the 7Be core excitation in the Coulomb breakup of 8B
into p + 7Be has been investigated. From the experimental results recently
obtained in RIKEN we have derived the mixing amplitude of the
  | 7Be(1/2-) X (1p_{3/2}); 2+> configuration in the ground state of 8B.
Implications on the evaluation of the S17 at stellar energies are discussed.
