Multi-quasiparticle excitation: Extending shape coexistence in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mo>~</mml:mo><mml:mn>190</mml:mn></mml:mrow></mml:math>neutron-deficient nuclei

Shi, Yue; Fang, Xu; Liu, H. L.; Walker, P. M.

doi:10.1103/physrevc.82.044314

Cited by 41 publications

(12 citation statements)

References 59 publications

(69 reference statements)

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“…The experimental energies of the isomers are well reproduced by our calculations [27]. It has been found that broken-pair multi-qp excitations extend nuclear shape coexistence, e.g., in A ∼ 190 neutron-deficient mass region [29]. In neutron-deficient Pb isotopes, the ground states have spherical shape, while the studied 2-qp high-K states have well-deformed oblate shapes [29].…”

Section: High-k Fission Isomers With Highly Elongated Shapes In Actinsupporting

confidence: 72%

“…It has been found that broken-pair multi-qp excitations extend nuclear shape coexistence, e.g., in A ∼ 190 neutron-deficient mass region [29]. In neutron-deficient Pb isotopes, the ground states have spherical shape, while the studied 2-qp high-K states have well-deformed oblate shapes [29]. For neutron-deficient Po isotopes, the ground states can be spherical, prolate, or oblate, while all the investigated 2-qp high-K states are oblate [29].…”

Section: High-k Fission Isomers With Highly Elongated Shapes In Actinmentioning

confidence: 99%

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New Studies on the Aspects of Nuclear Shapes

Fang¹,

Liu²,

Shi³

et al. 2013

Acta Phys. Pol. B

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Using the pairing-deformation-frequency self-consistent total-Routhiansurface and configuration-constrained potential-energy-surface calculations, we have studied nuclear deformation and its effect on the structure of nuclei. It was found that the high-order multipolarity-six (β 6 ) deformation plays a significant role in superheavy nuclei. Possible non-collective highspin isomeric states which locate in the second well of actinide nuclei have been investigated with the predictions of excitation energies and configurations. High-spin isomers can extend shape coexistence in A ∼ 190 neutrondeficient nuclei. Triaxiality with γ ∼ 30 • is found in the ground and excited rotational states of the A ∼ 70 germanium isotopes. Octupole correlations have also been discussed in different mass regions. In recent experiments, the textbook nucleus 158 Er has been reached at ultrahigh spins around 65 . We have studied 158 Er ultrahigh-spin states by means of the self-consistent tilted-axis-cranking method based on the Nilsson shell correction and the Skyrme-Hartree-Fock model. The calculation with a γ ≈ 12 • triaxialstrongly-deformed (TSD) excited configuration can well reproduce the observed large transitional quadrupole moment. It is demonstrated that the TSD minimum at negative γ deformation which appears in the principalaxis-cranking approach is a saddle point if allowing the rotational axis to change direction.

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Section: High-k Fission Isomers With Highly Elongated Shapes In Actinsupporting

confidence: 72%

Section: High-k Fission Isomers With Highly Elongated Shapes In Actinmentioning

confidence: 99%

New Studies on the Aspects of Nuclear Shapes

Fang¹,

Liu²,

Shi³

et al. 2013

Acta Phys. Pol. B

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“…More recently, a full study of even-even nuclei in the Pb region [127], showing specific results for the Po nuclei, is presented. It is interesting to point out that high-spin isomers have been studied in the Po, too, making use of a deformed Woods-Saxon potential, showing the effects of deformation on the specific excitation energy [128,129].…”

Section: Theoretical Approaches: the Evolving Situation In The Pmentioning

confidence: 99%

Nuclear shape coexistence in Po isotopes: An interacting boson model study

García-Ramos

Heyde

2015

Phys. Rev. C

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Background:The lead region, Po, Pb, Hg, and Pt, shows up the presence of coexisting structures having different deformation and corresponding to different particle-hole configurations in the shell-model language. Purpose: We intend to study the importance of configuration mixing in the understanding of the nuclear structure of even-even Po isotopes, where the shape coexistence phenomena are not clear enough. Method: We study in detail a long chain of polonium isotopes, [190][191][192][193][194][195][196][197][198][199][200][201][202][203][204][205][206][207][208] Po, using the interacting boson model with configuration mixing (IBM-CM). We fix the parameters of the Hamiltonians through a least-squares fit to the known energies and absolute B(E2) transition rates of states up to 3 MeV. Results: We obtained the IBM-CM Hamiltonians and we calculate excitation energies, B(E2)'s, electric quadrupole moments, nuclear radii and isotopic shifts, quadrupole shape invariants, wave functions, and deformations. Conclusions: We obtain a good agreement with the experimental data for all the studied observables and we conclude that shape coexistence phenomenon is hidden in Po isotopes, very much as in the case of the Pt isotopes.

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“…This assignment is unexpected, as no such isomer has been identified in neighboring isotopes. [24]. However, the only observed 10 − excited state in Po isotopes with determined configuration is the level with an excitation energy of 3.2 MeV in 210 Po.…”

Section: B Discussion For 194 Pomentioning

confidence: 84%

Short-lived isomers inPo192andPo194

et al. 2016

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Isomeric states in194 Po and 192 Po were studied at the velocity filter SHIP. Po. Several new γ -ray transitions were attributed to the isomers and γ -γ coincidences for both isomers were studied for the first time. The 459-keV transition earlier, tentatively proposed as de-exciting the isomeric level in 194 Po, was replaced by a new 248-keV transition, and the spin of this isomer was reassigned from (11 − )to(10 − ). The de-excitation of the (11 − ) isomeric level in 192 Po by the 154-keV transition was confirmed and a parallel de-excitation by a 733-keV (E3) transition to (8 + ) level of the ground-state band was suggested. Moreover, side feeding to the (4 + ) level of the ground-state band was proposed. The paper also discusses strengths of transitions de-exciting 11 − isomers in neighboring Po andPbisotopes.

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Multi-quasiparticle excitation: Extending shape coexistence inA~190neutron-deficient nuclei

Cited by 41 publications

References 59 publications

New Studies on the Aspects of Nuclear Shapes

New Studies on the Aspects of Nuclear Shapes

Nuclear shape coexistence in Po isotopes: An interacting boson model study

Short-lived isomers inPo192andPo194

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