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

被引：42

作者：

Amaro, J. E. ^{[1
]}

Maieron, C. ^{[1
]}

Barbaro, M. B. ^{[2
,3
]}

Caballero, J. A. ^{[4
]}

Donnelly, T. W. ^{[5
,6
]}

机构：

[1] Univ Granada, Dept Fis Atom Mol & Nucl, E Granada 18071, Spain

[2] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy

[3] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[4] Univ Seville, Dept Fis Atom Mol & Nucl, E-41080 Seville, Spain

[5] MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA

[6] MIT, Dept Phys, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW C | 2010年 / 82卷 / 04期

关键词：

EXCITATIONS;

D O I：

10.1103/PhysRevC.82.044601

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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.

引用

页数：13

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