Super deformation to maximum triaxiality in ; superdeformation, chiral bands and wobbling motion

Hamilton, J. H.; Zhu, S. J.; Luo, Y. X.; Ramayya, A. V.; Frauendorf, S.; Rasmussen, J. O.; Hwang, J. K.; Liu, S.H.; Ter-Akopian, G. M.; Daniel, A. V.; Oganessian, Yu. Ts.

doi:10.1016/j.nuclphysa.2010.01.010

Cited by 25 publications

(11 citation statements)

References 9 publications

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“…At ω ≈ 0.5 MeV, the routhians become very soft in θ, indicating a largeamplitude collective motion in this direction. This instability is not present for a (π = −, r = 1) configuration π(9, 9, 12, 12) ⊗ ν (18,17,15,14) (π4 4 ν5 5 ), which shows a pronounced minimum at θ = 90 • associated with γ > 0. This result is consistent with the deformationdriving effect of aligned h 11/2 neutrons orbitals discussed in Ref.…”

Section: High Spin Behaviormentioning

confidence: 94%

“…For instance, in the case [14][15][16] ν (17,17,15,15) in 106 Mo (shown by circles in Fig. 6(a)) can be denoted as π4 4 ν5 4 , and the same label applies to the π(9, 9, 12, 12) ⊗ ν (18,18,15,15) in 108 Mo (shown by up-triangles in Fig. 6(b)).…”

Section: High Spin Behaviormentioning

confidence: 99%

“…[12] by reporting a steady decrease of the γ-band bandhead energy. More evidence of collective triaxial behavior of Ru isotopes came from the spectroscopy of fission fragments [13][14][15][16][17][18]. The decrease of transition quadrupole moments at high spin showed that the triaxial deformation in neutron-rich Mo isotopes could be spin-dependent [19].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

et al. 2015

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Background: Whether atomic nuclei can possess triaxial shapes at their ground states is still a subject of ongoing debate. According to theory, good prospects for low-spin triaxiality are in the neutron-rich Mo-Ru region. Recently, transition quadrupole moments in rotational bands of even-mass neutron-rich isotopes of molybdenum and ruthenium nuclei have been measured. The new data have provided a challenge for theoretical descriptions invoking stable triaxial deformations.Purpose: To understand experimental data on rotational bands in the neutron-rich Mo-Ru region, we carried out theoretical analysis of moments of inertia, shapes, and transition quadrupole moments of neutron-rich even-even nuclei around 110 Ru using self-consistent mean-field and shell model techniques.Methods: To describe yrast structures in Mo and Ru isotopes, we use nuclear Density Functional Theory (DFT) with the optimized energy density functional UNEDF0. We also apply Triaxial Projected Shell Model (TPSM) to describe yrast and positive-parity, near-yrast band structures.Results: Our self-consistent DFT calculations predict triaxial ground-state deformations in 106,108 Mo and 108.110,112 Ru and reproduce the observed low-frequency behavior of moments of inertia. As the rotational frequency increases, a negative-γ structure, associated with the aligned ν(h 11/2 ) 2 pair, becomes energetically favored. The computed transition quadrupole moments vary with angular momentum, which reflects deformation changes with rotation; those variations are consistent with experiment. The TPSM calculations explain the observed band structures assuming stable triaxial shapes. Conclusions:The structure of neutron-rich even-even nuclei around 110 Ru is consistent with triaxial shape deformations. Our DFT and TPSM frameworks provide a consistent and complementary description of experimental data.

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Section: High Spin Behaviormentioning

confidence: 94%

Section: High Spin Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

et al. 2015

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“…Only a few indications for even-even wobbler have been reported. For instance, in 112 Ru [17], the ground band, and the odd and even spin members of the "γ-band" are proposed as the zero-, one-, and two-phonon wobbling bands, respectively. However, this wobbling interpretation is not very solid because no electromagnetic transition data were reported.…”

Section: Introductionmentioning

confidence: 99%

Two quasiparticle wobbling in the even-even nucleus 130Ba

2020

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Two newly observed bands built on a two-quasiparticle configuration in 130 Ba have been investigated for the first time with the microscopic projected shell model. The experimental energy spectra and the available electromagnetic transition probabilities are well reproduced. The wobbling character of the higher band is revealed by the angular momentum projected wavefunctions via the K plot and the azimuthal plot. This provides the first strong microscopic evidence for wobbling motion based on a two-quasiparticle configuration in even-even nuclei.

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“…For higher Z (≥42), the evolution of structure and shape coexistence becomes less clear, however it is well known that axial asymmetry begins to play an important role in the low-energy structure [16,24,34,[39][40][41][42][43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

New insights into triaxiality and shape coexistence from odd-mass Rh109

et al. 2018

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Rapid shape evolutions near A=100 are now the focus of much attention in nuclear science. Much of the recent work has been centered on isotopes with Z≤40, where the shapes are observed to transition between near-spherical to highly-deformed with only a single pair of neutrons added. At higher Z, the shape transitions become more gradual as triaxiality sets in, yet the coexistence of varying shapes continues to play an important role in the low-energy nuclear structure, particularly in the odd-Z isotopes. This work aims to characterize competing shapes in the triaxial region between Zr and Sn isotopes using ultra-fast timing techniques to measure lifetimes of excited states in the neutron-rich nucleus, 109 Rh. The measurements confirm the persistence at higher-Z of similarlylarge deformations observed near Z=40. Moreover, we show that new self-consistent mean-field calculations, with proper treatment of the odd nucleon, are able to reproduce the coexisting triaxial and highly-deformed configurations revealing, for the first time, the important contribution of the unpaired nucleon to these different shapes based on the blocking of specific single-particle orbitals.

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Super deformation to maximum triaxiality in ; superdeformation, chiral bands and wobbling motion

Cited by 25 publications

References 9 publications

Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

Two quasiparticle wobbling in the even-even nucleus 130Ba

New insights into triaxiality and shape coexistence from odd-mass Rh109

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