  It is shown that in the $d(p,pp)n$ reaction with a colinear geometry and the
two outgoing protons in a singlet state, the only two independent T-matrix
elements can be determined from spin correlation experiments. These matrix
elements are strongly dependent on the deuteron helicity amplitudes, which are
expected to vanish for $1.4fm^{-1}<p<1.7fm^{-1}$.\vspace{10 mm}\\
