Dispersive spherical optical model of neutron scattering from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>27</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:math>up to 250 MeV

Molina, Alberto; Capote, R.; Quesada, J. M.; Lozano, M.

doi:10.1103/physrevc.65.034616

Cited by 21 publications

(24 citation statements)

References 68 publications

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“…This asymmetry can be inferred from nuclear-matter calculations of the imaginary part of the self-energy [2]. A number of studies have made use of the framework of the DOM [4][5][6][7][8][9][10][11][12]. Some steps towards a global version of the DOM have been recently reported in [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Nonlocal extension of the dispersive optical model to describe data below the Fermi energy

et al. 2010

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Present applications of the dispersive-optical-model analysis are restricted by the use of a local but energy-dependent version of the generalized Hartree-Fock potential. This restriction is lifted by the introduction of a corresponding nonlocal potential without explicit energy dependence. Such a strategy allows for a complete determination of the nucleon propagator below the Fermi energy with access to the expectation value of one-body operators (like the charge density), the one-body density matrix with associated natural orbits, and complete spectral functions for removal strength. The present formulation of the dispersive optical model (DOM) therefore allows the use of elastic electron-scattering data in determining its parameters. Application to 40 Ca demonstrates that a fit to the charge radius leads to too much charge near the origin using the conventional assumptions of the functional form of the DOM. A corresponding incomplete description of high-momentum components is identified, suggesting that the DOM formulation must be extended in the future to accommodate such correlations properly. Unlike the local version, the present nonlocal DOM limits the location of the deeply-bound hole states to energies that are consistent with (e,e ′ p) and (p,2p) data.

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Section: Introductionmentioning

confidence: 99%

Nonlocal extension of the dispersive optical model to describe data below the Fermi energy

et al. 2010

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“…There are a number of examples of DOM fits to proton and neutron elasticscattering data [7][8][9][10][11][12][13][14][15]. Fitted DOM potentials usually describe single-particle properties reasonably well.…”

Section: Introductionmentioning

confidence: 99%

Dispersive-optical-model analysis of the asymmetry dependence of correlations in Ca isotopes

et al. 2007

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A dispersive-optical-model analysis of p+ 40,42,44,48 Ca and n+ 40 Ca interactions has been carried out. The real and imaginary potentials have been constrained by fitting elastic-scattering data, total and reaction cross sections, and level properties of valence hole states deduced from (e, e p) data. The resulting surface imaginary potential increases with asymmetry for protons, implying that in heavier Ca isotopes, protons experience stronger long-range correlations. Presently, there is not enough data for neutrons to determine their asymmetry dependence. Global optical-model fits usually assume that the neutron asymmetry dependence is equal in magnitude, but opposite in sign, to that for protons. Such a dependence was found to give unphysical results for heavy Ca isotopes. The dispersive optical model is shown to be a useful tool for data-driven extrapolations to the drip lines. Neutron and proton data at larger asymmetries are needed to achieve more reliable extrapolations. The present analysis predicts 60 Ca and 70 Ca to be bound, while the intermediate isotopes are not.

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“…However, in an earlier contribution from Mahaux and Sartor [15], they pointed out that because of nonlocality effects, the absorptive potential will be highly asymmetric (with respect to E F ). The DOM analysis of neutron scattering on 27 Al [26] showed the importance of the dispersive contribution to describe σ T data for energies above 100 MeV using a nonsymmetric version of the volume absorptive potential for large positive and large negative energies. We present strong evidence to favor nonsymmetric volume absorptive potential for a proper description of the nucleon scattering data for energies above 100 MeV on deformed targets.…”

Section: Introductionmentioning

confidence: 99%

Dispersive coupled-channel analysis of nucleon scattering fromTh232up to 200 MeV

et al. 2005

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An isospin-dependent coupled-channels optical model potential containing a dispersive term (including nonlocal contribution) is used to simultaneously fit the available experimental database (including strength functions and scattering radius) for neutron and proton scattering on strongly deformed 232 Th nucleus. The energy range 0.001-200 MeV is covered. A dispersive coupled-channel optical model potential with parameters that show a smooth energy dependence and energy independent geometry are determined from fits to the entire data set. Dispersive contribution is shown to be the dominant Coulomb correction to the proton real potential below the Coulomb barrier. Inclusion of nonlocality effects in the absorptive volume potential and its corresponding dispersive contribution to the real potential is needed to achieve an excellent agreement above 100 MeV.

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Dispersive spherical optical model of neutron scattering from27Alup to 250 MeV

Cited by 21 publications

References 68 publications

Nonlocal extension of the dispersive optical model to describe data below the Fermi energy

Nonlocal extension of the dispersive optical model to describe data below the Fermi energy

Dispersive-optical-model analysis of the asymmetry dependence of correlations in Ca isotopes

Dispersive coupled-channel analysis of nucleon scattering fromTh232up to 200 MeV

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