  We study the exclusive photoproduction of an electron-positron pair on a
neutron target in the Jefferson Lab energy domain. The reaction consists of two
processes: the Bethe-Heitler and the Timelike Compton Scattering. The latter
process provides potentially access to the Generalized Parton Distributions
(GPDs) of the nucleon. We calculate all the unpolarized, single- and
double-spin observables of the reaction and study their sensitivities to GPDs.
