First observation of 
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-soft and triaxial bands in Zr isotopes

Urban, W.; Rza̧ca‐Urban, T.; Wiśniewski, Jarosław A.; Smith, A. G.; Simpson, G. S.; Ahmad, I.

doi:10.1103/physrevc.100.014319

Cited by 17 publications

(12 citation statements)

References 41 publications

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“…Finally at 102 Zr, a triaxial global minimum is found at γ ≈ 15 • . Those γ-soft and triaxial shapes obtained for 100,102 Zr are compatible with the recent experimental results [8].…”

Section: Scmf Energy Surfaces For the Even-even Zr Isotopessupporting

confidence: 92%

“…In recent years a number of experimental and theoretical studies of the spectroscopy of even-even Zr isotopes have been reported. Most recent experimental results have suggested shape coexistence in 96 Zr [3] and 98 Zr [4,5], a quantum phase transition around the neutron number N ≈ 60 [6,7], and γ-soft and triaxial shapes at 100,102 Zr [8]. Theoretical studies have generally confirmed the interpretation of these experimental findings [3,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 85%

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Shape phase transitions in odd-A Zr isotopes

Nomura,

Nikšić,

Vretenar

2020

Preprint

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Spectroscopic properties that characterize shape phase transitions in neutron-rich odd-A Zr isotopes are investigated using the framework of nuclear density functional theory and particle-core coupling. The interacting-boson Hamiltonian of the even-even core nuclei, and the single-particle energies and occupation probabilities of the unpaired neutron are completely determined by deformation constrained self-consistent mean-field calculations based on the relativistic Hartree-Bogoliubov model with a choice of a universal energy density functional and pairing interaction. The triaxial (β, γ) deformation energy surfaces for even-even 94−102 Zr indicates transition from triaxial or γ-soft ( 94,96 Zr) to prolate ( 98 Zr), and triaxial ( 100,102 Zr) shapes. The corresponding low-energy excitation spectra of the odd-A Zr isotopes are in very good agreement with recent experimental results. Consistent with the structural evolution of the neighboring even-even Zr nuclei, the statedependent effective deformations and their fluctuations in the odd-A isotopes indicate a pronounced discontinuity around the transitional nucleus 99 Zr.

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“…Finally at 102 Zr, a triaxial global minimum is found at γ ≈ 15 • . Those γ-soft and triaxial shapes obtained for 100,102 Zr are compatible with the recent experimental results [8].…”

Section: Scmf Energy Surfaces For the Even-even Zr Isotopessupporting

confidence: 92%

Section: Introductionmentioning

confidence: 85%

Shape phase transitions in odd-A Zr isotopes

Nomura,

Nikšić,

Vretenar

2020

Preprint

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“…Recent experimental studies [50,51] have indicated the possibility of gamma soft and/or even triaxial deformation showing up in the case of 100 Zr by inspecting the decay of its first excited 0 + state. If confirmed, this could be a sign of a transition from a spherical structure into strongly deformed prolate energy spectra beyond mass number A = 100.…”

Section: Discussionmentioning

confidence: 99%

Quest of shape coexistence in Zr isotopes

García‐Ramos

Heyde

2019

Phys. Rev. C

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Background: The mass region with A ≈ 100 and Z ≈ 40 is known to experience a sudden onset of deformation. The presence of the subshell closure Z = 40 makes feasible to create particle-hole excitations at a moderate excitation energy and, therefore, likely intruder states could be present in the low-lying spectrum. In other words, shape coexistence is expected to be a key ingredient to understand this mass region.Purpose: The aim of this work is to describe excitation energies, transition rates, radii, and twoneutron separation energies for the even-even 94−110 Zr nuclei and, moreover, to obtain information about wave functions and deformation.Method: The interacting boson model with configuration mixing will be the framework to study the even-even Zr nuclei, considering only two types of configurations: 0particle-0hole and 2particle-2hole excitations. On one hand, the parameters appearing in the Hamiltonian and in the E2 transition operator are fixed trough a least-squares fit to the whole available experimental information. On the other hand, once the parameters have been fixed, the calculations allow to obtain a complete set of observables for the whole even-even Zr chain of isotopes.Results: Spectra, transition rates, radii, ρ 2 (E0), and two-neutron separation energies have been calculated and a good agreement with the experimental information has been obtained. Moreover, a detailed study of the wave function has been conducted and mean-field energy surfaces and deformation have been computed too.Conclusions: The importance of shape coexistence has been shown to correctly describe the A ≈ 100 mass area for even-even Zr nuclei. This work confirmed the rather spherical nature of the ground state of 94−98 Zr and its deformed nature for 100−110 Zr isotopes. The sudden onset of deformation in 100 Zr is owing to the rapid lowering of a deformed (intruder) configuration which is high-lying in lighter isotopes. 21.60.Fw

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“…As there is no candidate for a low-lying γ band in 98 Sr, the role of triaxiality in this nucleus remains an open question. (A candidate γ band has been suggested [276] in the isotone 100 Zr with a bandhead at 1292 keV.) The spectroscopic quadrupole moment of the 2 + 2 state, 2 +13 −12 efm 2 , is compatible with zero, and the B(E2;…”

Section: Even-even Nuclei With Z ≤40mentioning

confidence: 99%