Central depression of the nuclear charge distribution

Friedrich, J.; Voegler, N.; Reinhard, P.‐G.

doi:10.1016/0375-9474(86)90053-9

Cited by 26 publications

(27 citation statements)

References 14 publications

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“…The good agreement between the values extracted from the different minima after correction nicely demonstrates that the FSI effects are well under control at least as far as the position of the minima is concerned. For the charge distributions a systematic deviation of the dms radii extracted from the first and second diffraction minium has been found [5,6], which was related to the depression of the central density of the charge distribution in nuclei. It would be therefore very interesting, to investigate if such a central density suppression survives also into the mass density.…”

Section: Results From the Helm Modelmentioning

confidence: 95%

“…The nucleus 48 Ca has a larger core region of almost constant density but a smaller surface region, where the density drops from 90% to 10 [5]. For the model dependent analysis it is convenient to use Helm's model, which is known from the analysis of electron scattering data (see [5,6]) and allows to extract nuclear extension parameters in a transparent way. In this model the nuclear density is parameterized [5] by the convolution of a hard sphere distribution with a Gaussian.…”

Section: Form Factors In the Helm Modelmentioning

confidence: 99%

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Nuclear mass form factors from coherent photoproduction of πmesons

Krusche

2005

Eur. Phys. J. A

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Abstract. Data for coherent photoproduction of π 0 mesons from nuclei ( 12 C, 40 Ca, 93 Nb, nat Pb), recently measured with the TAPS detector at the Mainz MAMI accelerator, have been analyzed in view of the mass form factors of the nuclei. The form factors have been extracted in plane wave approximation of the A(γ, π 0 )A reaction and corrected for final state interaction effects with the help of distorted wave impulse approximations. Nuclear mass rms-radii have been calculated from the slope of the form factors for q 2 → 0. Furthermore, the Helm model (hard sphere form factor folded with Gaussian) was used to extract diffraction radii from the zeroes of the form factor and skin thicknesses from the position and height of its first maximum. The diffraction radii from the Helm model agree with the corresponding charge radii obtained from electron scattering experiments within their uncertainties of a few per cent. The rms-radii from the slope of the form factors are systematically lower by up to 5% for PWIA and up to 10% for DWIA. Also the skin thicknesses extracted from the Helm model are systematically smaller than their charge counter parts.PACS. 13.60.Le meson production -25.20.Lj photoproduction reactions -21.10.Gv mass distributions

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Section: Results From the Helm Modelmentioning

confidence: 95%

Section: Form Factors In the Helm Modelmentioning

confidence: 99%

Nuclear mass form factors from coherent photoproduction of πmesons

Krusche

2005

Eur. Phys. J. A

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“…We have found that fitting the calculated PWBA electric charge form factor with an extended Helm model [63] instead of the simple Helm model of Sec. II A leads to similar conclusions on the behavior of R 0 and σ 2 along the isotonic chain.…”

Section: -7mentioning

confidence: 99%

“…In spite of the fact that the surface falloff of the Helm densities is of Gaussian type, the agreement at the surface between the mean field and the equivalent Helm charge distributions is in general satisfactory. We are aware that a better reproduction of the charge density can be achieved by using an extended Helm model fit up to larger values of the momentum transfer [62][63][64]. However, here we restrict ourselves to the two-parameter Helm model introduced in Sec.…”

Section: A N = 82 Isotonic Chainmentioning

confidence: 99%

“…The original version of the Helm model [49] has been extended in various ways for a more accurate description of the experimental charge densities [62][63][64]. In the simplest version of the model [49], the charge density is obtained from the convolution of a constant density ρ 0 in a hard sphere of radius R 0 with a Gaussian distribution having variance σ 2 .…”

Section: A Equivalent Helm Charge Densitiesmentioning

confidence: 99%

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Electron scattering in isotonic chains as a probe of the proton shell structure of unstable nuclei

et al. 2013

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Electron scattering on unstable nuclei is planned in future facilities of the GSI and RIKEN upgrades. Motivated by this fact, we study theoretical predictions for elastic electron scattering in the N = 82, N = 50, and N = 14 isotonic chains from very proton-deficient to very proton-rich isotones. We compute the scattering observables by performing Dirac partial-wave calculations. The charge density of the nucleus is obtained with a covariant nuclear mean-field model that accounts for the low-energy electromagnetic structure of the nucleon. For the discussion of the dependence of scattering observables at low-momentum transfer on the gross properties of the charge density, we fit Helm model distributions to the self-consistent mean-field densities. We find that the changes shown by the electric charge form factor along each isotonic chain are strongly correlated with the underlying proton shell structure of the isotones. We conclude that elastic electron scattering experiments on isotones can provide valuable information about the filling order and occupation of the single-particle levels of protons.

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Sub-barrier fusion of35, 37Cl+58, 64Ni evidence of effects of proton transfer channels

Skorka

Stefanini

Fortuna

et al. 1987

Z. Physik A - Atomic Nuclei

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Sub-barrier fusion excitation functions of 35'37C1+58'64Ni have been measured. They are discussed in comparison to similar data of 34'36S + 5s'64Ni with the aim of revealing the influence of coupled proton transfer channels. Using the simplified coupled channel code CCFUS, differences in the effects of inelastic channels are eliminated in an approximative manner to stress the differences in the effects of transfer channels. Signatures of positive Q-value transfer channels coupled to fusion are clearly identified.

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Central depression of the nuclear charge distribution

Cited by 26 publications

References 14 publications

Nuclear mass form factors from coherent photoproduction of πmesons

Nuclear mass form factors from coherent photoproduction of πmesons

Electron scattering in isotonic chains as a probe of the proton shell structure of unstable nuclei

Sub-barrier fusion of35, 37Cl+58, 64Ni evidence of effects of proton transfer channels

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