Possible signature of tensor interactions observed via (p,dN) reaction at large momentum transfer

We report observation of new evidence for tensor interactions from 16O(p,dN) measurements at 392-MeV proton under quasi-free scattering kinematics but at scattering angle relevant to neutron pick up mechanism. To investigate isospin dependence of high-momentum component, an exclusive (p,dN) reaction experiment was performed recently at RCNP. Scattering deuterons and recoiled nucleons N[p or n] were measured by the spectrometer GrandRAIDEN and plastic scintillator telescopes or the newly developed stacked neutron detector BOS4. For 16O(p,dp)14N channel, the good excitation energy resolution allows to resolve several final states of the residual nuclei in the excitation energy spectra. Among the low-lying states in 14N, strong suppression for the lowest T=1 state was observed, which were observed in similar amplitudes with T=0 states in the other reactions. The missing transition to T=1 states suggests that high-momentum-correlated p-n pairs in nuclei are dominant T=0 nature. In neutron channel (p,dn), the observed cross section was found to be strongly suppressed also in comparison with (p,dp) T=0 channel. The observed clear isospin dependences can be understood by considering the tensor interactions at large-momentum transfer. Detailed reaction analysis will be discussed also.