Influence of the single-particle structure on the nuclear surface and the neutron skin

Warda, M.; Centelles, M.; Viñas, X.; Roca-Maza, X.

doi:10.1103/physrevc.89.064302

Cited by 25 publications

(20 citation statements)

References 80 publications

(156 reference statements)

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“…Average central densities, nuclear radius, and surface diffuseness are basic quantities characterizing finite nuclear systems. Extensive discussions are currently made on the proton-neutron differences of proton-neutron nuclear radii and diffusenesses to study the symmetry energy [270][271][272][273][274][275][276].…”

Section: Isotopic Trends Of the Nuclear Surface Properties Of Spherical Nucleimentioning

confidence: 99%

Self-consistent methods for structure and production of heavy and superheavy nuclei

et al. 2021

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Self-consistent methods for the structure of heavy and superheavy nuclei are reviewed. The construction and application of energy-density functionals are discussed. The relationship between the self-consistent methods and microscopic-macroscopic approaches is considered on the mean-field level. The extraction of single-particle potentials from the energy-density functional is described. The isotopic dependence of nucleon distributions and its influence on the nucleus-nucleus interaction is analyzed. As a new additional condition we introduce that the energy-density functional must describe the heights of the Coulomb barriers in nucleusnucleus interaction potentials, thus imposing constraints on the properties of the functional at low matter densities. The self-consistent methods are applied to describe the quasiparticle structure, cluster radioactivity, and fission of the heaviest nuclei. These methods are used to predict the probabilities of β-delayed multi-neutron emission and half-lives of β-decays and electron captures in heavy and superheavy nuclei. The predicted properties of superheavy nuclei are used to estimate the production cross-sections of superheavy nuclei in complete fusion reactions. Contents

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Section: Isotopic Trends Of the Nuclear Surface Properties Of Spherical Nucleimentioning

confidence: 99%

Self-consistent methods for structure and production of heavy and superheavy nuclei

et al. 2021

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“…Structural features of 150 Sm influencing the values of the susceptibilities χ k include the presence of unfilled high-n-low-l states [59] in the vicinity of the Fermi level and surface "tidal wave" excitations [60] comprising rotation-aligned octupole phonons. Excitation of the 2.615 MeV octupole vibration in 208 Pb induces a change [61] of only about 1.6% in the surface diffuseness of the relevant nuclear potential.…”

mentioning

confidence: 99%

Reappraisal of the limit on the variation inαimplied by the Oklo natural fission reactors

Davis

Hamdan

2015

Phys. Rev. C

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“…This interpretation, which relies on a semi-classical image of density profiles, breaks down in the Ni chain, where minimal E1 strength is obtained for N slightly smaller than Z, signifying a competition between Coulomb and asymmetry effects, on the one hand, and shell effects on the other. Indeed, the Ni shell structure tends to produce the opposite effect to asymmetry: Addition of neutrons to 56 Ni means filling up lower-ℓ states, which are extended to the nuclear surface, immediately initiating what resembles a neutron-skin effect [66]. Removal of neutrons from the 0f 7/2 state, on the other hand, creates some neutron deficiency towards the interior, rather than the exterior, thus delaying the onset of the proton-skin effect in the dipole response.…”

Section: Critical Discussion In View Of Other Existing Calculationsmentioning

confidence: 99%

Isoscalar and neutron modes in theE1spectra of Ni isotopes and the relevance of shell effects and the continuum

2015

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We study theoretically the electric dipole transitions of even Ni isotopes at low energies, using the self-consistent quasi-particle random-phase approximation with the D1S Gogny interaction and a continuum-RPA model with the SLy4 Skyrme force. We analyze isoscalar states, isovector states, and the dipole polarizability. We define a reference value for the polarizability, to remove a trivial dependence on the mass number. We compare our results with data and other calculations, with a focus on collective states, shell effects, and threshold transitions.Our results support the presence of a strong isoscalar transition, with little or moderate E1 strength, as a universal feature of ordinary nuclei. In moderately neutron-rich Ni isotopes, namely 68 Ni and neighboring isotopes, this transition is found bimodal due to couplings with surface neutrons. An adequate treatment of the continuum states appears essential for describing suprathreshold E1 strength, especially beyond 68 Ni. Very exotic isotopes (N > 50) are found highly polarizable, with practically all their E1 strength in the continuum. The dipole polarizability and the neutron-skin thickness are influenced by shell structure in different ways, so that they can appear anticorrelated. A comparison with existing results for lighter (Ca) and heavier (Sn) nuclei suggests that the so-called pygmy dipole strength is influenced strongly by shell effects and that, partly for that reason, its isospin structure depends on the mass region.

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Influence of the single-particle structure on the nuclear surface and the neutron skin

Cited by 25 publications

References 80 publications

Self-consistent methods for structure and production of heavy and superheavy nuclei

Self-consistent methods for structure and production of heavy and superheavy nuclei

Reappraisal of the limit on the variation inαimplied by the Oklo natural fission reactors

Isoscalar and neutron modes in theE1spectra of Ni isotopes and the relevance of shell effects and the continuum

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