  A microscopic formalism for describing observed cross sections for deuteron
breakup by three-nucleon nuclei was developed on the basis of the diffraction
nuclear model. A general formula that describes the amplitude for the reaction
d+3He->3He+p+n and which involves only one adjustable parameter was obtained by
using expansions of the integrands involved in terms of a Gaussian basis. This
formula was used to analyze experimental data on the exclusive cross sections
for deuteron breakup by He-3 nuclei at the projectile energy of 89.4 MeV. The
importance of employing, in calculations, a deuteron wave function that has a
correct asymptotic behavior at large nucleon-nucleon distances was
demonstrated.
