  Characterizing the many-body localization (MBL) transition in strongly
disordered and interacting quantum systems is an important issue in the field
of condensed matter physics. We study the single particle Green's functions for
a disordered interacting system in one dimension using exact diagnonalization
in the infinite temperature limit and provide strong evidence that single
particle excitations carry signatures of delocalization to MBL transition. In
the delocalized phase, the typical values of the local density of states and
the scattering rate are finite while in the MBL phase, the typical values for
both the quantities become vanishingly small. The probability distribution
functions of the local density of states and the scattering rate are broad
log-normal distributions in the delocalized phase while the distributions
become very narrow and sharply peaked close to zero in the MBL phase. We also
study the eigenstate Green's function for all the many-body eigenstates and
demonstrate that both, the energy resolved typical scattering rate and the
typical local density of states, can track the many-body mobility edges.
