Nuclear Science References (NSR)

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NSR database version of April 27, 2024.

Search: Author = A.Pedrak

Found 8 matches.

2023YA15 Phys.Rev. C 107, 054304 (2023)

J.Yang, J.Dudek, I.Dedes, A.Baran, D.Curien, A.Gaamouci, A.Gozdz, A.Pedrak, D.Rouvel, H.L.Wang

Islands of oblate hyperdeformed and superdeformed superheavy nuclei with D_3h point group symmetry in competition with normal-deformed D_3h states: "Archipelago" of D_3h-symmetry islands

NUCLEAR STRUCTURE ³⁰²Og, ²⁹²124, ³¹⁸130; calculated contours of projections of the total nuclear energy surfaces on (α22, α20), (α33, α20), ( α33, α22) and (α30, α20) planes, deformation parameters. N=166-206;Z=116-138; calculated single-particle neutron and proton energy levels, shell energies defined as sums of the Strutinsky and pairing correction energies, D_3h-symmetric hyperdeformed, superdeformed, and normal-deformed configurations. Found three separate islands of nuclei with D3h symmetry ("archipelago of three islands") differing by their average α20 < 0 deformations. Macroscopic-microscopic method with a realistic phenomenological Woods-Saxon potential.

doi: 10.1103/PhysRevC.107.054304
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2022YA11 Phys.Rev. C 105, 034348 (2022)

J.Yang, J.Dudek, I.Dedes, A.Baran, D.Curien, A.Gaamouci, A.Gozdz, A.Pedrak, D.Rouvel, H.L.Wang, J.Burkat

Exotic shape symmetries around the fourfold octupole magic number N=136: Formulation of experimental identification criteria

NUCLEAR STRUCTURE N=122-164; calculated single-particle neutron levelsand Routhians as functions of α₃₀, α₃₁, α₃₂ and α₃₃ octupole deformations; deduced very large neutron shell gaps at N=136 for all the four octupole deformations, and N=136 as a "universal or fourfold octupole magic number". ^{208,212,216,218}Pb, ^{218,220,222,224}Ra, ²²⁰Po, ²²²Rn, ²²⁴Ra, ²²⁶Th; calculated contours of projections of the total nuclear energy surfaces on (α₃₀, α₂₀) planes for all the isotopes, (α₃₁, α₂₀), (α₃₂, α₂₀), and (α₃₃, α₂₀) planes for ²¹⁸Pb, (α₃₂, α₂₀) planes for ^218,220, ^222,224Ra, and (α₃₁, α₂₀) and (α₃₂, α₂₀) planes for ²²⁰Po, ²²²Rn, ²²⁴Ra, ²²⁶Th. Discussed exotic point-group symmetries C_2ν, D_2d, T_d (tetrahedral symmetry), and D_3h in order to formulate spectroscopic criteria for experimental identifications through analysis of collective rotational bands generated by the symmetries. Macroscopic-microscopic method in multidimensional deformation spaces to analyze the expected exotic symmetries and octupole shape instabilities, tetrahedral point group symmetry, and realistic nuclear mean-field theory using phenomenological Woods-Saxon Hamiltonian combined with the Monte Carlo approach. Comparison with available experimental nuclear octupole deformations.

doi: 10.1103/PhysRevC.105.034348
Citations: PlumX Metrics

2022YA26 Phys.Rev. C 106, 054314 (2022)

J.Yang, J.Dudek, I.Dedes, A.Baran, D.Curien, A.Gaamouci, A.Gozdz, A.Pedrak, D.Rouvel, H.L.Wang

Exotic symmetries as stabilizing factors for superheavy nuclei: Symmetry-oriented generalized concept of nuclear magic numbers

NUCLEAR STRUCTURE Z=82-138, N=164-258; calculated single-particle proton and neutron energies, spherical orbital energies and shell gaps. ³¹⁴Og; calculated Monte Carlo simulated probability distributions of single-particle level position uncertainties for protons and neutrons. ³⁰⁸122; calculated proton and neutron single-particle energies as functions of the octupole deformations α₃₀, α₃₁, α₃₂ and α₃₃ in the center of Z=114-130, N=166-206 region. ³¹⁰Fl, ³¹⁴Og, ³¹⁸122, ³²²126, ³²⁶130; calculated potential-energy projection contours as functions of quadrupole deformation parameter α₂₀ and octupole deformation parameters α₃₀, α₃₁, α₃₂ and α₃₃ for ³¹⁰Fl, and α₃₂ for others. ^{296,298,300,302,304,306,308,310,312,314,316}Sg, ^{304,306,308,310,312,314,316,318,320,322,324}Fl, ³¹⁰Fl, ^{314,316,318,320,322,324,326,328,330,332,334}124, ³¹²Lv, ³¹⁴Og, ³¹⁶120, ³¹⁸122, ³²⁰124, ³²²126, ³²⁴128, ³²⁶130, ³²⁸132, ³³⁰134, ³³²136; calculated nuclear shell energies as functions of octupole deformation parameters α₃₀, α₃₁, α₃₂ and α₃₃, comparisons of nuclear shell-energies as functions of quadrupole deformation α₂₀, and octupole deformation parameters α₃₀ (pear-shaped), α₃₁, α₃₂, and α₃₃ for Z-114, N=190-210, and for N=196, Z=114-136 nuclei. ^{296,298,300,302,304,306,308,310,312,314,316}Sg, ^{314,316,318,320,322,324,326,328,330,332,334}124; calculated energies at the equilibrium before and after allowing the α₃₂ minimization. ^{280,282,284,286,288,290,292,294,296,298,300,302,304,306,308,310,312,314,316,318,320}Fl, ^{282,284,286,288,290,292,294,296,298,300,302,304,306,308,310,312,314,316,318,320,322}Lv, ^{284,286,288,290,292,294,296,298,300,302,304,306,308,310,312,314,316,318,320,322,324}Og, ^{286,288,290,292,294,296,298,300,302,304,306,308,310,312,314,316,318,320,322,324,326}120, ^{288,290,292,294,296,298,300,302,304,306,308,310,312,314,316,318,320,322,324,326,328}122, ^{290,292,294,296,298,300,302,304,306,308,310,312,314,316,318,320,322,324,326,328,330}124, ^{292,294,296,298,300,302,304,306,308,310,312,314,316,318,320,322,324,326,328,330,332}126, ^{294,296,298,300,302,304,306,308,310,312,314,316,318,320,322,324,326,328,330,332,334}128, ^{296,298,300,302,304,306,308,310,312,314,316,318,320,322,324,326,328,330,332,334,336}130; predicted quadrupole deformation α₂, components of octupole deformation α₃₀, α₃₁, α₃₂ and α₃₃ for the ground states, energy differences between the nearest quadrupole-shape minima and octupole-deformed configurations; deduced spherical or octupole deformed, with dominance of octupole-tetrahedral geometry for a majority of superheavy nuclei, which lowers the ground-state energy by up to 8 MeV. Realistic phenomenological mean-field approach with the deformed Woods-Saxon potential and macroscopic-microscopic method to examine impact of exotic shapes of nuclei associated with the four-fold octupole degrees of freedom on the stabilization of superheavy nuclei in the mass range of Z=114-130, and N=166-206.