NSR Query Results
Output year order : Descending NSR database version of May 24, 2024. Search: Author = A.Gaamouci Found 5 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 ^{302}Og, ^{292}124, ^{318}130; 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
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 α_{30}, α_{31}, α_{32} and α_{33} 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, ^{220}Po, ^{222}Rn, ^{224}Ra, ^{226}Th; calculated contours of projections of the total nuclear energy surfaces on (α_{30}, α_{20}) planes for all the isotopes, (α_{31}, α_{20}), (α_{32}, α_{20}), and (α_{33}, α_{20}) planes for ^{218}Pb, (α_{32}, α_{20}) planes for ^{218,220}, ^{222,224}Ra, and (α_{31}, α_{20}) and (α_{32}, α_{20}) planes for ^{220}Po, ^{222}Rn, ^{224}Ra, ^{226}Th. 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
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. ^{314}Og; calculated Monte Carlo simulated probability distributions of single-particle level position uncertainties for protons and neutrons. ^{308}122; calculated proton and neutron single-particle energies as functions of the octupole deformations α_{30}, α_{31}, α_{32} and α_{33} in the center of Z=114-130, N=166-206 region. ^{310}Fl, ^{314}Og, ^{318}122, ^{322}126, ^{326}130; calculated potential-energy projection contours as functions of quadrupole deformation parameter α_{20} and octupole deformation parameters α_{30}, α_{31}, α_{32} and α_{33} for ^{310}Fl, and α_{32} 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, ^{310}Fl, ^{314,316,318,320,322,324,326,328,330,332,334}124, ^{312}Lv, ^{314}Og, ^{316}120, ^{318}122, ^{320}124, ^{322}126, ^{324}128, ^{326}130, ^{328}132, ^{330}134, ^{332}136; calculated nuclear shell energies as functions of octupole deformation parameters α_{30}, α_{31}, α_{32} and α_{33}, comparisons of nuclear shell-energies as functions of quadrupole deformation α_{20}, and octupole deformation parameters α_{30} (pear-shaped), α_{31}, α_{32}, and α_{33} 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 α_{32} 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 α_{2}, components of octupole deformation α_{30}, α_{31}, α_{32} and α_{33} 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.
doi: 10.1103/PhysRevC.106.054314
2021BE23 Phys.Rev.Lett. 127, 112501 (2021) S.Beck, B.Kootte, I.Dedes, T.Dickel, A.A.Kwiatkowski, E.M.Lykiardopoulou, W.R.Plass, M.P.Reiter, C.Andreoiu, J.Bergmann, T.Brunner, D.Curien, J.Dilling, J.Dudek, E.Dunling, J.Flowerdew, A.Gaamouci, L.Graham, G.Gwinner, A.Jacobs, R.Klawitter, Y.Lan, E.Leistenschneider, N.Minkov, V.Monier, I.Mukul, S.F.Paul, C.Scheidenberger, R.I.Thompson, J.L.Tracy, Jr., M.Vansteenkiste, H.-L.Wang, M.E.Wieser, C.Will, J.Yang Mass Measurements of Neutron-Deficient Yb Isotopes and Nuclear Structure at the Extreme Proton-Rich Side of the N=82 Shell ATOMIC MASSES ^{150,151,152,153,154,155,156}Yb; measured frequencies, TOF; deduced mass excess values. Comparison with systematics, AME2020 evaluation. TITAN's multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). RADIOACTIVITY ^{151}Yb(IT); measured decay products; deduced excitation energy.
doi: 10.1103/PhysRevLett.127.112501
2021GA18 Phys.Rev. C 103, 054311 (2021) A.Gaamouci, I.Dedes, J.Dudek, A.Baran, N.Benhamouda, D.Curien, H.L.Wang, J.Yang Exotic toroidal and superdeformed configurations in light atomic nuclei: Predictions using a mean-field Hamiltonian without parametric correlations NUCLEAR STRUCTURE ^{28}Si, ^{28,30,38,40}Si, ^{32,40,42}S, ^{36}Ar, ^{40}Ca, ^{44}Ti, ^{48}Cr, ^{56}Ni, ^{52,56}Fe, ^{82,84,100}Zr; A≈30-50; calculated nuclear potential energy surfaces in (α_{20}, α_{40}) and (β_{2}cos(γ+30°)), (β_{2}sin(γ+30°)) planes using mean-field calculations in multidimensional deformation spaces with phenomenological Woods-Saxon Hamiltonian, Monte-Carlo Hamiltonian parameter adjustments based on doubly-magic spherical nuclei: ^{16}O, ^{40}Ca, ^{48}Ca, ^{56}Ni, ^{90}Zr, ^{132}Sn, ^{146}Gd and ^{208}Pb, parametric-correlation removal; tested parametric uncertainties, theoretical prediction uncertainty propagation with nucleon numbers; generated nuclear shape coexistence, low-energy toroidal shape excitations, superdeformed oblate and prolate shapes, exotic shapes and isomers. Comparison with available experimental information for deformation parameters.
doi: 10.1103/PhysRevC.103.054311
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