EPJ

2025 Impact factor 3.0
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 16, 381-385 (2003)
DOI: 10.1140/epja/i2002-10065-1

Core polarization effects on C4 form factors of $\mth{sd}$-shell nuclei

R.A. Radhi

Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq

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(Received: 24 January 2002 / Revised version: 18 May 2002 / Published online: 6 March 2003)

Abstract
Coulomb form factors of C4 transitions in even-even N= Z sd-shell nuclei ( $\chem{^{{20}}Ne}$, $\chem{^{{24}}Mg}$, $\chem{^{{28}}Si}$ and $\chem{^{{32}}S}$) are discussed taking into account higher-energy configurations outside the sd-shell model space which are called core polarization effects. Higher configurations are taken into account through a microscopic theory, which allows particle-hole excitations from the 1 s and 1 p shells core orbits and also from the 2s1d-shell orbits to the higher allowed orbits with excitations up to 4 $\hbar \omega $ . The effect of core polarization is found essential in both the transition strengths and momentum transfer dependence of form factors, and gives a remarkably good agreement with the measured data with no adjustable parameters. The calculations are based on the Wildenthal interaction for the sd-shell model space and on the modified surface delta interaction (MSDI) for the core polarization effects.

PACS
25.30.Dh - Inelastic electron scattering to specific states.
21.60.Cs - Shell model.
27.30.+t - $20 \leq A \leq 38$ .

© Società Italiana di Fisica, Springer-Verlag 2003

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