EPJ

2024 Impact factor 2.8
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 14, 239-245 (2002)
DOI: 10.1140/epja/i2001-10123-2

Contribution of the $\mth{\Delta(1232)}$ to the $\mth{(e,e'p)}$ reaction along with Coulomb distortion effects

K.S. Kim1, M.K. Cheoun2, S.W. Hong1 and Y. Chung3

1  BK21 Physics Research Division and Institute of Basic Science, Sungkyunkwan University, Suwon, 440-746 Korea
2  ICUNSF, Building 139-1, Seoul National University, Seoul, 150-741, Korea
3  Department of Physics, Yosu National University, Yosu, 550-250, Korea

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(Received: 21 July 2001 / Revised version: 5 March 2002 Communicated by V. Vento)

Abstract
The $\Delta$-resonance contribution has been included in the (e,e'p) reaction along with Coulomb distortion effects. We treat the resonance via a non-relativistic $\Delta$ current operator and use a Dirac Hartree single-particle model for the ground-state single-particle wave function and a relativistic optical model for the knocked-out proton wave function. It is assumed that the $\pi$-meson created by the virtual photon is absorbed in the target nucleus following the production of a $\Delta$-resonance. Our DWBA calculation shows that the $\Delta$-resonance contribution to the (e,e'p) reaction cross-section is 10-15% for an energy of 250 MeV transfered to the proton knocked out of the s-shell of $\chem{^{40}Ca}$, in the parallel and perpendicular kinematics.

PACS
24.90.+d - Other topics in nuclear reactions: general.
25.30.-c - Lepton-induced reactions.

© Società Italiana di Fisica, Springer-Verlag 2002

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