Electron-induced proton knock-out from 30Si, 31P and 32S

Neutron scattering from28Si and32S from 8.0 to 18.9 MeV, dispersive optical model analyses, and ground-state correlations

“…However, for the 2s 1/2 protonhole state in 32 S, our DOM prediction of 4.01 fm is much higher than the experimental result of 3.59 ± 0.10 fm from Ref. [62]. This discrepancy raises the possibility that the proton DOMs should have different geometries than those for the neutron DOMs.…”

“…The prediction for 2s 1/2 in 32 S is lower than both the experimental value of 0.79 ± 0.07 from Ref. [62], and the USD prediction of 0.77. Our DOM predictions of S nlj for the valence orbitals are slightly below the 60% -70% quenching of the independent-particle model value found from quasi-elastic electron scattering [63] and joint analyses of (e,e'p) and (d, 3 He) measurements for stable nuclei over the periodic table [64].…”

“…[62]. Overall, the proton DOM predictions for R rms nlj are slightly higher than the neutron predictions.…”

“…More significant improvements are expected by using the nonlocality of the PereyBuck type for the Hartree-Fock potential component, as has been discussed recently [71]. Full microscopic nonlocal DOM calculations in the bound-state region would shed light on the interpretation of spectral distributions deduced from (e,e'p) measurements [62]. Although such calculations are highly desirable, their implementation for open-shell, deformed nuclei probably lie some years in the future.…”

Spectroscopic amplitudes for one-nucleon transfer between 1p0f-shell nuclei

“…However, the spectroscopic factors determined from (e,e'p)-reactions are surprisingly small compared to results obtained with transfer reactions, sometimes even by 30-40% (de Witt Huberts 1990). Theoretical investigations initiated to understand this effect (Pandharipande 1989, Benhar et al 1989, Van Neck et al 1991, Wesseling et al 1992 indicate that short-range correlations and uncertainties of the (e,e'p)-reaction mechanism, in particular due to the final state interaction sector may be responsible for this effect (de Witt Huberts 1990). The lack of reliability of the approximations inherent in these models, in particular for light nuclei and mediummass systems, still does not seem to allow to make significant conclusions on possible differences of spectroscopic factors deduced from nuclear transfer and (e,e'p)-reactions (for a more detailed discussion see de Witt Huberts 1990).…”