Low-spin non-yrast states in light tungsten isotopes and the evolution of shape coexistence

Kibédi, T.; Dracoulis, George; Byrne, Aidan; Davidson, Paul

doi:10.1016/s0375-9474(00)00600-x

Cited by 37 publications

(8 citation statements)

References 97 publications

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“…Figure 10 compares band 1 in 168 Os with the systematic trends established for the heavier isotopes. These trends resemble those established for the W isotopes by Kibédi et al, who found that the states in the first excited positive-parity bands have a parabolic energy dependence on neutron number [35].…”

Section: B Rdds Lifetime Measurementssupporting

confidence: 87%

Excited states and reduced transition probabilities in Os168

Grahn¹,

Stolze²,

Joss³

et al. 2016

Phys. Rev. C

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The level scheme of the neutron-deficient nuclide 168 Os has been extended and mean lifetimes of excited states have been measured by the recoil distance Doppler-shift method using the JUROGAM γ -ray spectrometer in conjunction with the IKP Köln plunger device. The 168 Os γ rays were measured in delayed coincidence with recoiling fusion-evaporation residues detected at the focal plane of the RITU gas-filled separator. The ratio of reduced transition probabilities B(E2; 4is measured to be 0.34(18), which is very unusual for collective band structures and cannot be reproduced by interacting boson model (IBM-2) calculations based on the SkM* energy-density functional.

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Section: B Rdds Lifetime Measurementssupporting

confidence: 87%

Excited states and reduced transition probabilities in Os168

Grahn¹,

Stolze²,

Joss³

et al. 2016

Phys. Rev. C

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“…The only remaining candidate for the feature in 168 Os is mixing between states in the ground state band and low-lying states in a non-yrast positive-parity band [3]. However, no analogous band has been observed in 166 W, which is consistent with the systematic trends established for the W isotopes [42].…”

mentioning

confidence: 54%

Reduced transition probabilities along the yrast line in W166

Sayğı¹,

Joss²,

Page³

et al. 2017

Phys. Rev. C

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Lifetimes of excited states in the yrast band of the neutron-deficient nuclide 166 W have been measured utilizing the dpuns plunger device at the target position of the jurogam ii γ-ray spectrometer in conjunction with the ritu gas-filled separator and the great focal-plane spectrometer. Excited states in 166 W were populated in the 92 Mo(78 Kr,4p) reaction at a bombarding energy of 380 MeV. The measurements reveal a low value for the ratio of reduced transitions probabilities for the lowest-lying transitions B(E2; 4 + → 2 +)/B(E2; 2 + → 0 +)=0.33(5), compared with the expected ratio for an axially deformed rotor (B 4/2 = 1.43).

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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%

“…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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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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Low-spin non-yrast states in light tungsten isotopes and the evolution of shape coexistence

Cited by 37 publications

References 97 publications

Excited states and reduced transition probabilities in Os168

Excited states and reduced transition probabilities in Os168

Reduced transition probabilities along the yrast line in W166

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

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