Exploring Nuclear Exotica at the Limits

Afanasjev, A. V.; Agbemava, S. E.; Taninah, A.

doi:10.5506/aphyspolbsupp.13.347

Cited by 3 publications

(6 citation statements)

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“…The extrapolation of the two-proton drip for ellipsoidal shapes, defined from its general trends seen in the Z < 120 nuclei, is displayed by thick orange dashed lines. Similar extrapolation for two-neutron drip line of ellipsoidal shapes is close to the two-neutron drip line of toroidal shapes (see Fig.1in Ref [4]…”

supporting

confidence: 79%

“…There is a quite substantial dependence of the fission barrier heights for ellipsoidal-like shapes on CEDF with the PC-PK1 and NL3* (DD-ME2 and DD-PC1) functionals providing the lowest (highest) barrier heights for superheavy nuclei among the CEDFs considered in Ref. [4] and a similar situation is also expected in the hyperheavy nuclei.…”

Section: Functional Dependence Of the Resultsmentioning

confidence: 57%

“…The bunching of the pairs of the orbitals of the same parity with dominant structure of Ω[N, n z , Λ] and (Ω + 1)[N, n z , Λ] with N ≥ 9 and n z = 0 (see Table II) 4 leads to the appearance of toroidal shell gaps at particle numbers 6, 10, 14,18,22,26,30,34,38,42,46 at the bottom of proton and neutron potentials (see Fig. 12).…”

Section: B Shell Structure Of Toroidal Hyperheavy Nucleimentioning

confidence: 99%

“…Recent systematic investigations of hyperheavy (Z ≥ 126) nuclei performed in Refs. [1,2,4] have allowed to shed some light on these questions. Emerging new physics is summarized in Figs.…”

Section: Introductionmentioning

confidence: 99%

“…This transition drastically modifies the underlying single-particle structure and as a consequence lowers the energy of the Fermi level for protons (see Ref. [4]). The density profiles reflect their relative sizes with respect of the spherical shape in the minimum D. See Fig.…”

Section: Introductionmentioning

confidence: 99%

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Hyperheavy spherical and toroidal nuclei: the role of shell structure

Agbemava,

Afanasjev

2020

Preprint

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The properties of toroidal hyperheavy even-even nuclei and the role of toroidal shell structure are extensively studied within covariant density functional theory. The general trends in the evolution of toroidal shapes in the Z ≈ 130 − 180 region of nuclear chart are established for the first time. These nuclei are stable with respect of breathing deformations. The most compact fat toroidal nuclei are located in the Z ≈ 136, N ≈ 206 region of nuclear chart, but thin toroidal nuclei become dominant with increasing proton number and on moving towards proton and neutron drip lines. The role of toroidal shell structure, its regularity, supershell structure, shell gaps as well as the role of different groups of the pairs of the orbitals in its formation are investigated in detail. The lowest in energy solutions at axial symmetry are characterized either by large shell gaps or low density of the single-particle states in the vicinity of the Fermi level in at least one of the subsystems (proton or neutron). Related quantum shell effects are expected to act against the instabilities in breathing and sausage deformations for these subsystems. The investigation with large set of covariant energy density functionals reveals that substantial proton Z = 154 and 186 and neutron N = 228, 308 and 406 spherical shell gaps exist in all functionals. The nuclei in the vicinity of the combination of these particle numbers form the islands of stability of spherical hyperheavy nuclei. The study suggests that the N = 210 toroidal shell gap plays a substantial role in the stabilization of fat toroidal nuclei.

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supporting

confidence: 79%

Section: Functional Dependence Of the Resultsmentioning

confidence: 57%

Section: B Shell Structure Of Toroidal Hyperheavy Nucleimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hyperheavy spherical and toroidal nuclei: the role of shell structure

Agbemava,

Afanasjev

2020

Preprint

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Hyperheavy spherical and toroidal nuclei: The role of shell structure

Agbemava

Afanasjev

2021

Phys. Rev. C

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Covariant density functional theory input for r-process simulations in actinides and superheavy nuclei: the ground state and fission properties

Taninah,

Agbemava,

Afanasjev

2020

Preprint

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The systematic investigation of the ground state and fission properties of even-even actinides and superheavy nuclei with Z = 90 − 120 from the two-proton up to two-neutron drip lines with proper assessment of systematic theoretical uncertainties has been performed for the first time in the framework of covariant density functional theory (CDFT). These results provide a necessary theoretical input for the r-process modeling in heavy nuclei and, in particular, for the study of fission cycling. Four state-of-the-art globally tested covariant energy density functionals (CEDFs), namely, DD-PC1, DD-ME2, NL3* and PC-PK1, representing the major classes of the CDFT models are employed in the present study. Ground state deformations, binding energies, two neutron separation energies, α-decay Qα values and half-lives and the heights of fission barriers have been calculated for all these nuclei. Theoretical uncertainties in these physical observables and their evolution as a function of proton and neutron numbers have been quantified and their major sources have been identified. Spherical shell closures at Z = 120, N = 184 and N = 258 and the structure of the single-particle (especially, high-j) states in their vicinities as well as nuclear matter properties of employed CEDFs are two major factors contributing into theoretical uncertainties. However, different physical observables are affected in a different way by these two factors. For example, theoretical uncertainties in calculated ground state deformations are affected mostly by former factor, while theoretical uncertainties in fission barriers depend on both of these factors.

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Exploring Nuclear Exotica at the Limits

Cited by 3 publications

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Hyperheavy spherical and toroidal nuclei: the role of shell structure

Hyperheavy spherical and toroidal nuclei: the role of shell structure

Hyperheavy spherical and toroidal nuclei: The role of shell structure

Covariant density functional theory input for r-process simulations in actinides and superheavy nuclei: the ground state and fission properties

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