Dominance of S-1(0) proton-pair emission in the O-16(e,e'pp) reaction

The reaction O-16(e, e'pp) has been studied at a transferred four-momentum (omega, \q\) = (210 MeV, 300 MeV/c). Evidence has been obtained for direct knockout of proton pairs from the 1p shell. The excitation-energy spectrum of the residual nucleus and the missing-momentum densities indicate that knockout of a S-1(0) pair dominates the reaction, while there is also a noticeable contribution from knockout of P-3 pairs

Signatures for short-range correlations in O-16 observed in the reaction O-16(e,e ' pp)C-14

The reaction O-16(e,e'pp)C-14 has been studied at a transferred four-momentum (omega,\q\) = (210 MeV, 300 MeV/c). The differential cross sections for the transitions to the ground state and the lowest excited states in C-14 were determined as a function of the momentum of the recoiling C-14 nucleus and the angle between the momentum of the proton emitted in the forward direction and the momentum transfer q. A comparison of the data to the results of calculations, performed with a microscopic model, shows clear signatures for short-range correlations in the O-16 ground state