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2s1/2 occupancies in 30Si, 31P, and 32S

AuthorsWesseling, J.; de Jager, C. W.; Lapikas, L.; de Vries, H.; Fagg, L. W.; Harakeh, M. N.; Kalantar, N.; Lindgren, R. A.; Moya de Guerra, Elvira ORCID; Sarriguren, Pedro CSIC ORCID
KeywordsElastic electron-scattering
Single-particle properties
Hartree-fock calculations
Issue DateJun-1997
PublisherAmerican Physical Society
CitationPhysical review C 55: 2773 (1997)
AbstractElastic electron scattering off Si-30 and P-31 was studied in an effective momentum-transfer range of 1.8-3.0 fm(-1). The form-factor data were analyzed together with existing data sets for these nuclei and for S-32 in a model-independent Fourier-Bessel expansion. For P-31 the M1 contribution was subtracted following an established parametrization. Results of Hartree-Fock (HF) calculations, performed for these three nuclei in a spherical basis and in an axially deformed basis, are compared to experiment. Occupancies have been determined which, when used in the spherical-basis HF calculations, lead to a good description of the elastic form-factor data. The deformed-basis calculations have been used to study the influence of the deformation on the calculated binding energies and ground-state charge densities. In all calculations the influence of using different effective nucleon-nucleon interactions was investigated. The resulting differences in 2s(1/2) in occupancy are combined with results from previous existing (e,e'p) experiments to yield ''absolute occupancies'' for the 2s(1/2) orbital. The deduced 2s(1/2) occupancies for Si-30 and S-32 are 0.24(4) and 1.35(19), respectively.
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