Non-yrast states and shape co-existence in light Pt isotopes

Davidson, Paul; Dracoulis, George; Kibédi, T.; Byrne, Aidan; Anderssen, S.S.; Baxter, A.M.; Fabricius, B.; Lane, G. J.; Stuchbery, A.E.

doi:10.1016/s0375-9474(99)00340-1

Cited by 62 publications

(26 citation statements)

References 21 publications

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“…It was shown experimentally [16][17][18][19] that, in the nonyrast states of lighter W, Os, and Pt nuclei, the band mixing could arise more or less from the coexistence of the different aforementioned intrinsic states and makes it rather difficult to identify the clear band structure by a model prediction. The band-mixing feature should be outside of the model space of bosons with low spin on which the IBM is built and may be somewhat difficult to be reproduced.…”

Section: Moments Of Inertiamentioning

confidence: 99%

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Collective structural evolution in neutron-rich Yb, Hf, W, Os, and Pt isotopes

et al. 2011

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An interacting-boson-model Hamiltonian determined from Hartree-Fock-Bogoliubov calculations with the microscopic Gogny energy density functional D1M is applied to the spectroscopic analysis of neutron-rich Yb, Hf, W, Os, and Pt isotopes with mass A ∼ 180-200. Excitation energies and transition rates for the relevant low-lying quadrupole collective states are calculated by this method. Transitions from prolate to oblate ground-state shapes are analyzed as a function of neutron number N in a given isotopic chain by calculating excitation energies, B(E2) ratios, and correlation energies in the ground state. It is shown that such transitions tend to occur more rapidly for the isotopes with lower proton number Z when departing from the proton shell closure Z = 82. The triaxial degrees of freedom turn out to play an important role in describing the considered mass region. Predicted low-lying spectra for the neutron-rich exotic Hf and Yb isotopes are presented. The approximations used in the model and the possibilities to refine its predictive power are addressed.

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Section: Moments Of Inertiamentioning

confidence: 99%

“…Experimentally, low-lying spectroscopy provides a very powerful source of information that allows one to establish signatures correlating the nuclear shape evolution with the energy spectra [14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Collective structural evolution in neutron-rich Yb, Hf, W, Os, and Pt isotopes

et al. 2011

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“…The experimental data that we have used are taken from the Nuclear Data Sheets (NDS), Adopted Values references [47,48,49,50,51,52,53,54,55,56,57,58], unless the latest issue was published more than 10 years ago. Therefore, for the mass number A = 182, 184 and 192, the experimental data were taken from [66,79,71], respectively.…”

Section: The Fitting Procedure: Energy Spectra and Absolute B(e2) Redmentioning

confidence: 99%

“…¿From left to right we give: isotope, transition, γ-ray energy, intensity of the transition, multipolarity, δ value, experimental relative B(E2) value, IBM-CM calculation and ECQF calculation. Data are taken from [51,54,55,56,57,58], C. Baglin [79], complemented with references [66,71]. * Pure E2 transition assumed.…”

Section: Acknowledgmentmentioning

confidence: 99%

The Pt isotopes: Comparing the Interacting Boson Model with configuration mixing and the extended consistent-Q formalism

García-Ramos

Heyde²

2009

Nuclear Physics A

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The role of intruder configurations in the description of energy spectra and B(E2) values in the Pt region is analyzed. In particular, we study the differences between Interacting Boson Model calculations with or without the inclusion of intruder states in the even Pt nuclei 172−194 Pt. As a result, it shows that for the description of a subset of the existing experimental data, i.e., energy spectra and absolute B(E2) values up to an excitation energy of about 1.5 MeV, both approaches seem to be equally valid. We explain these similarities between both model spaces through an appropriate mapping. We point out the need for a more extensive comparison, encompassing a data set as broad (and complete) as possible to confront with both theoretical approaches in order to test the detailed structure of the nuclear wave functions. 21.60.Fw. PACS

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“…The ground states of Hg isotopes in the mass range A = 182 − 188 are found to be weakly deformed and of predominantly oblate nature, while the excited 0 + 2 states in 182,184 Hg exhibit a larger deformation. Similarly, low-lying states in light Pt isotopes have been studied experimentally with γ-ray spectroscopy [13][14][15], showing that shape coexistence of states with different deformation is still present in neutron-deficient Pt isotopes with Z = 78. Moderate odd-even staggering was also found in very light Pt isotopes from laser spectroscopy [16].…”

Section: Introductionmentioning

confidence: 99%

Effects of deformation on theβ-decay patterns of light even-even and odd-mass Hg and Pt isotopes

Boillos

Sarriguren

2015

Phys. Rev. C

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Bulk and decay properties, including deformation energy curves, charge mean square radii, Gamow-Teller (GT) strength distributions, and β-decay half-lives, are studied in neutron-deficient even-even and odd-A Hg and Pt isotopes. The nuclear structure is described microscopically from deformed quasiparticle random-phase approximation calculations with residual interactions in both particle-hole and particle-particle channels, performed on top of a self-consistent deformed quasiparticle Skyrme Hartree-Fock basis. The observed sensitivity of the, not yet measured, GT strength distributions to deformation is proposed as an additional complementary signature of the nuclear shape. The β-decay half-lives resulting from these distributions are compared to experiment to demonstrate the ability of the method.

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Non-yrast states and shape co-existence in light Pt isotopes

Cited by 62 publications

References 21 publications

Collective structural evolution in neutron-rich Yb, Hf, W, Os, and Pt isotopes

Collective structural evolution in neutron-rich Yb, Hf, W, Os, and Pt isotopes

The Pt isotopes: Comparing the Interacting Boson Model with configuration mixing and the extended consistent-Q formalism

Effects of deformation on theβ-decay patterns of light even-even and odd-mass Hg and Pt isotopes

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