Surface and volume term nonlocalities in the proton–nucleus elastic scattering process

Zureikat, R.A.; Jaghoub, M. I.

doi:10.1016/j.nuclphysa.2013.08.007

Cited by 20 publications

(28 citation statements)

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“…Recently, the VDP was used to describe nucleon elastic scattering from light, medium, and heavy nuclei. It resulted in significant improvements in describing the elastic angular distributions of neutron scattering from the 1p-shell 12 C nucleus [12], the medium 40 Ca nucleus [13], and proton elastic scattering from 12 C, 16 O, 54 Fe, and 58 Ni [14]. However, the energy ranges considered in the last three references were 12-20 MeV for the neutron case and 12-40 for proton scattering.…”

Section: Discussionmentioning

confidence: 99%

“…This is different from all the works in Refs. [12][13][14] in which the reduced mass of the nucleonnucleus system was used in the spin-orbit term. We have used the pion mass for ease of comparison with the conventional optical model (COM).…”

Section: The Nonlocal Velocity-dependent Optical Potentialmentioning

confidence: 99%

“…Below 19 MeV, however, the optical model calculations for the angular distributions resulted in two minima while only one was experimentally observed, and the calculated angular distributions were generally below the corresponding experimental data. One important observation is that for 12 C, 14 N, and 16 O, the positions of the large angle minima in the angular distributions were not correctly reproduced. Such minima are usually associated with the presence of nonlocalities that are partly from coupling of the ground state of the target nucleus to inelastic excitations [11].…”

Section: Introductionmentioning

confidence: 96%

“…As we shall see in the next section, the Schrödinger equation for a VDP contains terms that are proportional to the derivative of a Woods-Saxon potential. Using the same model, neutron scattering from the heavier 40 Ca was studied in the energy range 10-20 MeV [13], while proton elastic scattering from 12 C, 16 O, 40 Ca, and 58 Ni was investigated in the 10-to 40-MeV range [14]. In the latter two works, the calculated VDP elastic angular distributions agreed well with the corresponding experimental data even in the large angle scattering region, where the conventional optical model (COM) does not usually lead to good fits.…”

Section: Introductionmentioning

confidence: 99%

“…This might explain the excellent elastic angular distribution fits for nucleon scattering from the light 1p-shell nuclei in Refs. [12] and [14].…”

Section: Introductionmentioning

confidence: 99%

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Velocity-dependent optical potential for neutron elastic scattering from1p-shell nuclei

Ghabar

Jaghoub

2015

Phys. Rev. C

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Background: The conventional optical model is quite successful in describing the nucleon elastic scattering data from medium and heavy nuclei. However, its success in describing the light 1p-shell nuclei is somewhat limited. The velocity-dependent optical potential resulted in a significant improvement in describing the elastic angular distributions for light nuclei in the low energy region. Purpose: To extend the formalism of the velocity-dependent potential to higher energies, and to assess its importance in describing neutron elastic scattering data from light 1p-shell nuclei at high energies. Method: We fit the angular distribution data for neutron elastic scattering from 12 C and 16 O using (i) the velocity-dependent optical potential and (ii) the conventional optical potential. The results of the two models are then compared. At low energies, we compare our angular distribution fits with the fits of other works that exist in the literature. Furthermore, the total integrated cross sections in addition to the analyzing power are calculated using the velocity-dependent optical potential and compared to the experimental data. Results: The velocity-dependent potential resulted in significant improvements in describing the angular distributions particularly in the large-angle scattering region and for certain energy ranges. This model is important where the experimental data show structural effects from nuclear surface deformations, which are important in light nuclei. Furthermore, the calculated total elastic cross sections and analyzing power are in good agreement with the experimental data. Conclusions:The velocity-dependent potential gives rise to surface-peaked real terms in the optical model. Such terms account, at least partly, for the structural effects seen in the angular distribution data. The energy range over which the surface terms are needed is found to depend on the target nucleus. Other works that have introduced real surface terms in the optical potential are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: The Nonlocal Velocity-dependent Optical Potentialmentioning

confidence: 99%