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Longitudinal and Transverse Form Factors from C-12


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د.فؤاد,عطية,مجيد ,Longitudinal and Transverse Form Factors from C-12 , Time 5/2/2011 7:22:15 PM : كلية التربية للعلوم الصرفة

وصف الابستركت (Abstract)


Study of Transverse and Longitudinal form factors of C-12

الوصف الكامل (Full Abstract)


Longitudinal and Transverse Form Factors from C-12
Abstract :
Electron scattering form factors from 12C have been studied in the framework of the particle-hole shell model. Higher configurations are taken into account by allowing particle-hole excitations from the 1s and 1p shells core orbits up to the 1f-2p shell. The inclusion of the higher configurations modifies the form factors markedly and describes the experimental data very well in all momentum transfer regions.
INTRODUCTION
Shell model calculations, carried out within a model space in which the nucleons are restricted to occupy a few orbits are unable to reproduce the measured static moments or transition strengths without scaling factors. Inadequacies in the shell model wavefunctions are revealed by the need to scale the matrix elements of the one-body operators by effective charges to match the experimental data. However, the introduction of effective charges may bring the calculated transition strengths which are defined at the photon point, as well as, the form factors at the first maximum, closer to the measured values, but the non-zero momentum transfer (q) values might deviate appreciably from the measured values [1]. Electron scattering at 200 MeV on 12C and 13C, have been studied by Sato et al. [2]. The effect of higher configurations wavefunctions are included in the work of Bennhold et al. [3].
 
Booten et al. [4] investigated the higher configurations contributions on some p-shell nuclei. Coulomb form factors of C2 transitions in several selected p-shell nuclei are discussed by Radhi et al. [5] taking into account core-polarization effects. Configuration mixing shell model has been recently used [6] to study the isovector states of 12C in the framework of particle-hole theory. The calculations are quite successful and describe the experimental form factors very well for all momentum transfer regions.
Dear reader for full text paper, please click on attached PDF file.  This paper published in Physica scripta "Royal Swedish academy). http://iopscience.iop.org/1402-4896/76/4/009 

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