Nuclear photoreactions at intermediate energies

A Model for Two-Proton Emission Induced by Electron Scattering

“…Because of the energy and momentum conservation, Eqs. (38) and (39), this kinematic set up implies the change of the energy of the proton for every emission angle. We have used an approximation consisting in neglecting the recoil of the A − 2 residual nucleus, therefore the energy of the emitted nucleons is the same for every emission angle.…”

“…16 O (e,e'2p) 14 C 40 Ca (e,e'2p) 38 Ar It is interesting to notice that the angular distributions of the 0 + states do not change their form by changing γ p 2 , only the size of the peak is modified. The situation is rather different for the 2 + states.…”

“…The 16 O(e,e'2p) 14 C cross sections calculated in standard kinematics with this correlation function are shown in Fig. 16 by 40 Ca(e,e'2p) 38 Ar cross section calculated in the standard kinematics. The full, dotted and dashed lines, have been obtained by using respectively the G, S3 and V 8 correlation functions of Fig.…”

“…The energy of the other proton is obtained from Eq. (38) by setting p r = 0, that is in the NRA, and the cross section are presented as a function of γ p 1 , the emission angle. We always work in coplanar kinematics, i.e.…”

“…In this section we discuss the sensitivity of our results to the presence of the ∆ currents. There are various aspects of the description of electromagnetically induced ∆ excitation that are still largely debated [38,39]. It is not our aim to enter in this discussion.…”