Pionic correlations and meson-exchange currents in two-particle emission induced by electron scattering

J. E. Amaro, C. Maieron, M. B. Barbaro, J. A. Caballero, and T. W. Donnelly

Phys. Rev. C 82, 044601 – Published 4 October 2010

Abstract

Two-particle two-hole contributions to electromagnetic response functions are computed in a fully relativistic Fermi gas model. All one-pion exchange diagrams that contribute to the scattering amplitude in perturbation theory are considered, including terms for pionic correlations and meson-exchange currents (MECs). The pionic correlation terms diverge in an infinite system and thus are regularized by modification of the nucleon propagator in the medium to take into account the finite size of the nucleus. The pionic correlation contributions are found to be of the same order of magnitude as the MECs.

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Received 30 July 2010

DOI:https://doi.org/10.1103/PhysRevC.82.044601

Authors & Affiliations

J. E. Amaro¹, C. Maieron¹, M. B. Barbaro², J. A. Caballero³, and T. W. Donnelly⁴

¹Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, E-Granada 18071, Spain
²Dipartimento di Fisica Teorica, Università di Torino and Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Via P. Giuria 1, I-10125 Torino, Italy
³Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, Apdo. 1065, E-41080 Sevilla, Spain
⁴Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

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Vol. 82, Iss. 4 — October 2010

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Physical Review C

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