Center-of-mass effects in electromagnetic two-proton knockout reactions

Abstract

The role of center-of mass (CM) effects in the one-body nuclear current in the description of electromagnetically induced two-nucleon knockout reactions is discussed in connection with the problem of the lack of orthogonality between initial bound states and final scattering states obtained by the use of an energy-dependent optical model potential. Results for the cross sections of the exclusive ${}^{16}$O(e,e${}^{\prime }$pp)${}^{14}$C and ${}^{16}$O($\gamma$,pp)${}^{14}$C knockout reactions in different kinematics are presented and discussed. In super-parallel kinematics CM effects produce a strong enhancement of the ${}^{16}$O(e,e${}^{\prime }$pp)${}^{14}$C${}_{g.s.}$ cross section which strongly reduces the destructive interference between the one-body and $\Delta$-current and the sensitivity to the treatment of the $\Delta$-current found in previous work.

arXiv comment9 pages, 5 figures

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Cited by in corpus (3)

• Knockout of proton-neutron pairs from ${}^{16}$O with electromagnetic probes
• Electromagnetic proton-neutron knockout off 16O: new achievements in theory
• Nuclear Physics with Electroweak Probes