Electromagnetic structure of the helium isotopes

McCarthy, J. S.; Sick, I.; Whitney, R. R.

doi:10.1103/physrevc.15.1396

Cited by 313 publications

(157 citation statements)

References 56 publications

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“…Since the charge distribution of unstable nuclei is the main subject of the coming experiments at next-generation electron-nucleus colliders, this problem deserves further study. For the sake of completeness we show the comparison of the DWBA results with available experimental data for the charge form factors of the isotopes 4 He [65,66] and 6 Li [67,68] (Fig. 7), 58 Ni [69] and 62 Ni [70] (Fig.…”

Section: Resultsmentioning

confidence: 99%

Charge and matter distributions and form factors of light, medium, and heavy neutron-rich nuclei

et al. 2005

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Results of charge form factors calculations for several unstable neutron-rich isotopes of light, medium, and heavy nuclei (He, Li, Ni, Kr, Sn) are presented and compared to those of stable isotopes in the same isotopic chain. For the lighter isotopes (He and Li) the proton and neutron densities are obtained within a microscopic large-scale shell-model, while for heavier ones Ni, Kr, and Sn the densities are calculated in deformed self-consistent mean-field Skyrme HF+BCS method. We also compare proton densities to matter densities together with their rms radii and diffuseness parameter values. Whenever possible comparison of form factors, densities and rms radii with available experimental data is also performed. Calculations of form factors are carried out both in plane wave Born approximation (PWBA) and in distorted wave Born approximation (DWBA). These form factors are suggested as predictions for the future experiments on the electron-radioactive beam colliders where the effect of the neutron halo or skin on the proton distributions in exotic nuclei is planned to be studied and thereby the various theoretical models of exotic nuclei will be tested.

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Section: Resultsmentioning

confidence: 99%

Charge and matter distributions and form factors of light, medium, and heavy neutron-rich nuclei

et al. 2005

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“…This result can also be derived in a more direct way by considering the following identities 55) where in the first line the volume integral of j ij (x) has been re-expressed in terms of the divergence of the current, ignoring vanishing surface contributions, and in the second line use has been made of the CCR. Evaluation of the commutator leads to Eq.…”

Section: Two-body Currentmentioning

confidence: 99%

Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator

et al. 2005

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Different models for conserved two-and three-body electromagnetic currents are constructed from two-and three-nucleon interactions, using either meson-exchange mechanisms or minimal substitution in the momentum dependence of these interactions. The connection between these two different schemes is elucidated. A number of low-energy electronuclear observables, including (i) np radiative capture at thermal neutron energies and deuteron photodisintegration at low energies, (ii) nd and pd radiative capture reactions, and (iii) isoscalar and isovector magnetic form factors of 3 H and 3 He, are calculated in order to make a comparative study of these models for the current operator. The realistic Argonne v18 two-nucleon and Urbana IX or Tucson-Melbourne three-nucleon interactions are taken as a case study. For A=3 processes, the bound and continuum wave functions, both below and above deuteron breakup threshold, are obtained with the correlated hyperspherical-harmonics method. Three-body currents give small but significant contributions to some of the polarization observables in the 2 H(p, γ) 3 He process and the 2 H(n, γ) 3 H cross section at thermal neutron energies. It is shown that the use of a current which did not exactly satisfy current conservation with the two-and three-nucleon interactions in the Hamiltonian was responsible for some of the discrepancies reported in previous studies between the experimental and theoretical polarization observables in pd radiative capture.

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“…3. The charge form factor of 3 He (left) and 4 He (right) compared with the experimental data of (McCarthy et al, 1977) and the theoretical fit to the data (Amroun et al, 1994).…”

Section: Charge Form Factorsmentioning

confidence: 99%

“…In these figures the theoretical charge form factors are compared with experimental data from (Frosch et al, 1967;McCarthy et al, 1977). In the comparison phenomenological parametrization (Amroun et al, 1994) that fit experimental universal data of the form factors for electron-nucleus scattering are also shown.…”

Section: Charge Form Factorsmentioning

confidence: 99%