Nonaxial-octupole<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Y</mml:mi><mml:mn>32</mml:mn></mml:msub></mml:math>correlations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>150</mml:mn></mml:mrow></mml:math>isotones from multidimensional constrained covariant density functional theories

Zhao, Jie; Lü, Bin; Zhao, En-Guang; Zhou, Shan‐Gui

doi:10.1103/physrevc.86.057304

Cited by 67 publications

(69 citation statements)

References 55 publications

(66 reference statements)

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“…With these configuration assignments for the two pairs of nearly degenerate bands, calculations based on a combination of the microscopic multidimensionally-constrained covariant density functional theory (MDC-CDFT) [48][49][50] and the triaxial particle rotor model (TPRM) [51][52][53][54] have been performed. The MDC-CDFT calculations with the PC-PK1 parameterization [55] show that the deformation parameters are ðβ 2 ; γÞ ¼ ð0.32; 15.1°Þ and (0.23, 26.3°) for the πg 9=2 ⊗ νg 9=2 and πf 5=2 ⊗ νg 9=2 configurations, respectively.…”

mentioning

confidence: 99%

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Liu¹,

Wang²,

Bark³

et al. 2016

Phys. Rev. Lett.

104

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Two pairs of positive-and negative-parity doublet bands together with eight strong electric dipole transitions linking their yrast positive-and negative-parity bands have been identified in 78 Br. They are interpreted as multiple chiral doublet bands with octupole correlations, which is supported by the microscopic multidimensionally-constrained covariant density functional theory and triaxial particle rotor model calculations. This observation reports the first example of chiral geometry in octupole soft nuclei. DOI: 10.1103/PhysRevLett.116.112501 Spontaneous symmetry breaking is a fundamental concept in nature. As a many-body quantum system, the atomic nucleus carries a wealth of information on fundamental symmetries and symmetry breaking. As one example, chiral symmetry breaking in atomic nuclei has attracted considerable attention and intensive discussion since it was first predicted by Frauendorf and Meng [1]. They pointed out that, in the intrinsic frame of the rotating triaxial nucleus, the total angular momentum vector may lie outside the three principal planes, referred to as chiral geometry. The spontaneous chiral symmetry breaking in the laboratory frame may give rise to pairs of nearly degenerate ΔI ¼ 1 bands with the same parity, i.e., chiral doublet bands. Such chiral doublet bands were first observed in N ¼ 75 isotones [2]. So far, more than 30 experimental candidates have been reported in the A ∼ 80, 100, 130, and 190 mass regions [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].Based on constrained triaxial covariant density functional theory (CDFT) calculations, it has been suggested that multiple chiral doublet (MχD) bands can exist in a single nucleus [21][22][23][24][25][26]. The theoretical prediction of MχD bands stimulated lots of experimental efforts [27][28][29][30][31]. The first experimental evidence for MχD bands was reported in 133 Ce [27], which confirmed the manifestation of triaxial shape coexistence in this nucleus. Later, Kuti et al. reported a novel type of MχD bands with the same configuration in 103 Rh [29], which showed that chiral geometry can be robust against the increase of the intrinsic excitation energy.Compared to the A ∼ 130 and 100 mass regions, the A ∼ 80 mass region is a relatively new and less studied territory for the investigation of chiral symmetry breaking in rotating nuclei, with only one report of chiral doublet bands based on the πg 9=2 ⊗ νg 9=2 configuration in odd-odd 80 Br [18]. In 78 Br, the πg 9=2 ⊗ νg 9=2 band was suggested to have an obvious triaxial shape [32], which is suitable for the construction of chiral doublet bands.

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mentioning

confidence: 99%

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Liu¹,

Wang²,

Bark³

et al. 2016

Phys. Rev. Lett.

104

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“…We can also expect, the appearance of additional low-lying 0 − and 2 − bands, as a negative parity doublets to the β and γ-vibrational bands. Note that the alternative explanation of the appearance of the low-lying 2 − bands in actinides is based on the concept of tetrahedral deformation [17,18].…”

Section: Excitation Spectra Of Actinidesmentioning

confidence: 99%

Manifestation of cluster effects in the structure of actinides

Shneidman

Adamian²,

Antonenko

et al. 2016

EPJ Web of Conferences

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Abstract. We developed a cluster model which allows to take into account both shape deformation parameters and cluster degrees of freedom. The model is based on the assumption that the wave function of nucleus can be treated as a superposition of a mononucleus and two-cluster configurations. The model is applied to describe the multiple negative-parity bands in deformed actinides. Special emphasis is made on the investigation of the recently measured positive parity 0 + 2 rotational band of reflection-asymmetric nature in 240 Pu. The results suggest that this band might be understood as the one built on the lowest excited state in mass asymmetry degree of freedom.

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“…A self-consistent and microscopic study of Y 32 effects in these N = 150 isotones was carried out in Ref. [81] and it was found that, for ground states of 248 Cf and 250 Fm, β 32 > 0.03 and the energy gain due to the β 32 distortion is more than 300 keV.…”

Section: Introductionmentioning

confidence: 99%

Tetrahedral shapes of neutron-rich Zr isotopes from a multidimensionally constrained relativistic Hartree-Bogoliubov model

et al. 2017

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We develop a multidimensionally constrained relativistic Hartree-Bogoliubov (MDC-RHB) model in which the pairing correlations are taken into account by making the Bogoliubov transformation. In this model, the nuclear shape is assumed to be invariant under the reversion of x and y axes; i.e., the intrinsic symmetry group is V4 and all shape degrees of freedom β λµ with even µ are included self-consistently. The RHB equation is solved in an axially deformed harmonic oscillator basis. A separable pairing force of finite range is adopted in the MDC-RHB model. The potential energy curves of neutron-rich even-even Zr isotopes are calculated with relativistic functionals DD-PC1 and PC-PK1 and possible tetrahedral shapes in the ground and isomeric states are investigated. The ground state shape of 110 Zr is predicted to be tetrahedral with both functionals and so is that of 112 Zr with the functional DD-PC1. The tetrahedral ground states are caused by large energy gaps around Z = 40 and N = 70 when β32 deformation is included. Although the inclusion of the β30 deformation can also reduce the energy around β20 = 0 and lead to minima with pear-like shapes for nuclei around 110 Zr, these minima are unstable due to their shallowness.

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Nonaxial-octupoleY32correlations inN=150isotones from multidimensional constrained covariant density functional theories

Cited by 67 publications

References 55 publications

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Manifestation of cluster effects in the structure of actinides

Tetrahedral shapes of neutron-rich Zr isotopes from a multidimensionally constrained relativistic Hartree-Bogoliubov model

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