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

Abstract

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, 190-208Po, 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.

To be published in Physical Review C. arXiv admin note: text overlap with arXiv:1312.4595

References in corpus (8)

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• Disentangling the nuclear shape coexistence in even-even Hg isotopes using the interacting boson model

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• The subtle connection between shape coexistence and quantum phase transition. The Zr case
• Shell model based deformation analysis of light Cadmium isotopes
• Islands of shape coexistence from single-particle spectra in covariant density functional theory
• Bohr Hamiltonian with an energy dependent $\gamma$-unstable Coulomb-like potential
• Signatures for shape coexistence and shape/phase transitions in even-even nuclei
• Interplay between shape-phase transitions and shape coexistence in the Zr isotopes
• Shape coexistence in Sr isotopes
• Mixed configurations and intertwined quantum phase transitions in odd-mass nuclei
• Configuration mixing and intertwined quantum phase transitions in odd-mass niobium isotopes
• Persistent vibrational structure in ${}^{110-116}$Cd
• Shape evolution in even-mass ${}^{98-104}$Zr isotopes via lifetime measurements using the $\gamma \gamma$-coincidence technique
• Probing Quadruple Deformation in Transitional Nuclei via Angular Momentum Projection