  The isospin character of p-n pairs at large relative momentum has been
observed for the first time in the 16O ground state. A strong population of the
J,T=1,0 state and a very weak population of the J,T=0,1 state were observed in
neutron pick up domain of 16O(p,pd) at 392 MeV. This strong isospin dependence
at large momentum transfer is not reproduced by the distorted-wave impulse
approximation calculations with known spectroscopic amplitudes. The results
indicate the presence of high-momentum protons and neutrons induced by the
tensor interactions in ground state of 16O.
