Effect of tensor interactions in 16O studied via (p,d) reaction*

We report a possible evidence of tensor interactions in $^{16}$O observed via high-momentum (p,d) reaction. We measured the differential cross sections populating the ground states and several low-lying excited states in $^{15}$O. Comparing the ratios of the cross sections for the 5/2$^+$ and the $3/2^-$ excited states to the one for the ground state over a wide range of momentum transfer, we found a marked enhancement of the ratio for the 5/2$^+$ state as compared to that for the $3/2^-$ state. The observation is consistent with large components of high-momentum neutrons in the initial ground-state configurations explainable by the tensor interactions.