The combined effects of the short-range NN interaction and of
long-range correlations associated with the finite size of the
nucleus have been investigated publ.70
for the two-proton removal amplitudes from
^{16}O to discrete final states of the
final nucleus ^{14}C. As a first step,
the sp spectral function has to be obtained by including the
depletion of shell-model orbits by short-range correlations. This is
accomplished by treating the energy dependence of the sp energies
obtained from the G-matrix effective interaction. With the same
interaction, the Tamm-Dancoff coupling of the sp motion to
two-particle-one-hole and two-hole-one-particle states was included
to describe the effect of long-range correlations
publ.69. With this description of the sp propagator, the
two-proton removal amplitudes were calculated using the dressed RPA
method (DRPA). The effect of short-range correlations on this
two-proton removal spectral function is then taken into account by
the replacement of the relative uncorrelated
^{1}S_{0}
and
^{3}P_{J}
wave functions by correlated ones, using defect wave functions from
the solution of the Bethe-Goldstone equation in
^{16}O. For low-lying discrete final
states, the resulting spectral functions display a considerable
sensitivity to the chosen realistic NN interaction.

Calculations of the triple-coincidence cross section have been
completed using the reaction code of the Pavia group
ref.1, employing as input the two-nucleon removal amplitudes
described above. This code includes the effects of two-body currents
due to the excitation of the D resonance
as well as a treatment of FSI by means of spin-dependent optical
potentials. The results of this study
publ.73 suggest that the (e,e'2p) reaction may be highly
selective since the calculations indicate the exclusive population of
the lowest 0^{+} and
2^{+} states by the removal of a
^{1}S_{0}
proton pair, whereas the 1^{+} state
is dominated by
^{3}P_{J}
removal. The calculations reported in
publ.73 were performed for kinematical settings relevant to
recent experiments at NIKHEF and Mainz. Under these conditions, the
knockout of a
^{3}P_{J}
proton pair is largely due to the (two-body) D
current. The
^{1}S_{0}
pair knockout, on the other hand, is dominated by the one-body
current and therefore sensitive to two-body short-range correlations.
Accordingly, good prospects for the study of these long-sought
correlations exist in the
^{16}O(e,e'2p) reaction involving the
lowest states of ^{14}C. Our group has
collaborated on a publication of the analysis of the NIKHEF data
publ.75 in which actual
triple-coincidence cross sections are reported for the
^{16}O(e,e'2p)^{14}C
reaction. The comparison of the data with our calculations is also
published in this letter and shows clear signatures of short-range
correlations in the ^{16}O ground state. Further data in different kinematical conditions confirm this conclusion and were published in publ.79**.**

**REFERENCES**