Neutron halos in heavy nuclei-relativistic mean field approach

Baran, A.; Pomorski, K.; Warda, M.

doi:10.1007/s002180050210

Cited by 10 publications

(8 citation statements)

References 20 publications

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“…At large distance and for r ≃ 0, the f 7/2 one-neutron state strongly dominates all the other ones. This clearly indicates that the halo is a single particle effect in this nucleus, which confirms earlier results obtained with Skyrme forces [1] and with the relativistic mean field theory [3]. The middle plot of the lowest row in Fig.…”

Section: Resultssupporting

confidence: 90%

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The neutron halo in heavy nuclei calculated with the Gogny force

Nerlo-Pomorska¹,

Pomorski²,

Berger³

et al. 2000

Eur. Phys. J. A

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The proton and neutron density distributions, one-and two-neutron separation energies and radii of nuclei for which neutron halos are experimentally observed, are calculated using the self-consistent Hartree-Fock-Bogoliubov method with the effective interaction of Gogny. Halo factors are evaluated assuming hydrogen-like antiproton wave functions. The factors agree well with experimental data. They are close to those obtained with Skyrme forces and with the relativistic mean field approach.

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Section: Resultssupporting

confidence: 90%

“…In particular, it has been found that several neutron rich nuclei display a neutron skin or even a neutron 'stratosphere' called the neutron halo. Such properties of neutron distributions have been predicted by the asymptotic density model [2], the relativistic mean field theory [3], and Hartree-Fock calculations with Skyrme forces [1].…”

Section: Introductionmentioning

confidence: 99%

The neutron halo in heavy nuclei calculated with the Gogny force

Nerlo-Pomorska¹,

Pomorski²,

Berger³

et al. 2000

Eur. Phys. J. A

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“…The number of nuclei with one fewer neutron or proton is proportional to the quantities Im(δp n )ρ n or Im(δp p )ρ p , respectively, integrated over the region where the annihilation process takes place. Thus, approximately, one can estimate theoretically the halo factor as [37,48] …”

Section: Some Aspects Of the Methods And Results In Antiprotonic mentioning

confidence: 99%

Analysis of bulk and surface contributions in the neutron skin of nuclei

et al. 2010

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The neutron skin thickness of nuclei is a sensitive probe of the nuclear symmetry energy and has multiple implications for nuclear and astrophysical studies. However, precision measurements of this observable are difficult to obtain. The analysis of the experimental data may imply some assumptions about the bulk or surface nature of the formation of the neutron skin. Here we study the bulk or surface character of neutron skins of nuclei following from calculations with Gogny, Skyrme, and covariant nuclear mean-field interactions. These interactions are successful in describing nuclear charge radii and binding energies but predict different values for neutron skins. We perform the study by fitting two-parameter Fermi distributions to the calculated self-consistent neutron and proton densities. We note that the equivalent sharp radius is a more suitable reference quantity than the half-density radius parameter of the Fermi distributions to discern between the bulk and surface contributions in neutron skins. We present calculations for nuclei in the stability valley and for the isotopic chains of Sn and Pb.

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“…Therefore, at the present stage of this research we concentrate on the HFB method. We hope that in future works our experimental data will allow to discriminate between different approaches [64] modelling the nuclear periphery.…”

Section: A Nuclear Periphery From Hfb Calculationsmentioning

confidence: 99%

Composition of the nuclear periphery from antiproton absorption

et al. 1998

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Thirteen targets with mass numbers from 58 to 238 were irradiated with the antiproton beam from the Low Energy Antiproton Ring facility at CERN leading to the formation of antiprotonic atoms of these heavy elements. The antiproton capture at the end of atomic cascade results in the production of more or less excited residual nuclei. The targets were selected with the criterion that both reaction products with one nucleon less than the proton and neutron number of the target are radioactive. The yield of these radioactive products after stopped-antiproton annihilation was determined using gamma-ray spectroscopy techniques. This yield is related to the proton and neutron density in the target nucleus at radial distance corresponding to the antiproton annihilation site. The experimental data clearly indicate the existence of a neutron rich nuclear periphery, a "neutron halo", strongly correlated with the target neutron separation energy Bn, and observed for targets with Bn < 10 MeV. For two target nuclei, 106 Cd and 144 Sm, with larger neutron binding energies a proton rich nuclear periphery was observed. Most of the experimental data are in reasonable agreement with calculations based on current antiproton-nucleus and pion-nucleus interaction potentials and on nuclear densities deduced with the help of the Hartree-Fock-Bogoliubov approach. This approach was, however, unable to account for the 106 Cd and 144 Sm results.

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Neutron halos in heavy nuclei-relativistic mean field approach

Cited by 10 publications

References 20 publications

The neutron halo in heavy nuclei calculated with the Gogny force

The neutron halo in heavy nuclei calculated with the Gogny force

Analysis of bulk and surface contributions in the neutron skin of nuclei

Composition of the nuclear periphery from antiproton absorption

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