Excitation Energies of Superdeformed States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Pb</mml:mi><mml:mprescripts/><mml:none/><mml:mn>196</mml:mn></mml:mmultiscripts></mml:math>: Towards a Systematic Study of the Second Well in Pb Isotopes

Wilson, A. N.; Singh, A. K.; Hübel, H.; Davidson, Paul; Görgen, A.; Rossbach, D.; Korichi, A.; Astier, A.; Azaiez, F.; Bazzacco, D.; Bourgeois, C.; Buforn, N.; Byrne, Aidan; Dracoulis, George; Hannachi, F.; Hauschild, K.; Körten, W.; Kröll, T.; Lane, G. J.; Лопез-Мартенс, А.; Redon, N.; Reiter, P.; Rossi‐Alvarez, C.; Schönwaßer, G.; Stézowski, O.; Thirolf, P. G.

doi:10.1103/physrevlett.95.182501

Cited by 20 publications

(20 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The detailed calculated results can be found in Tables I-IV. Figure 2 also displays the experimental values for yrast SD bands in lead isotopes in which single-step transitions from SD bands to ND bands were observed [30][31][32][33]. For the yrast SD band of 192 Pb, the agreement between measurements and our calculations is very good.…”

Section: Calculations and Discussionsupporting

confidence: 54%

Superdeformed multi-quasiparticle high-Kstates and possible isomers in Pb and Po isotopes

et al. 2012

Self Cite

View full text Add to dashboard Cite

Configuration-constrained potential-energy-surface calculations have been performed to investigate multiquasiparticle high-K states built on superdeformed minima in 192,194,196 Pb and 198 Po. The calculations predict that 196 Pb and 198 Po would be favorable candidates for the observation of low-lying superdeformed two-and fourquasiparticle high-K states. The possible decay paths and lifetimes that could lead to isomers are evaluated in detail for 196 Pb. Comparisons between the predictions and previous observations of octupole-vibrational excitations indicate also that bands built on superdeformed high-K intrinsic states may compete with the octupole-vibrational mode in this mass region. The quadrupole moments of both the collective and intrinsic excitations are analyzed.

show abstract

Section: Calculations and Discussionsupporting

confidence: 54%

Superdeformed multi-quasiparticle high-Kstates and possible isomers in Pb and Po isotopes

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…The SD bands found for nuclei in the neutron-deficient A ≃ 190 region are of special interest for our analysis, because for some of them the decay-out to ND yrast states occurs at low spins of about 10 , and with only a few intermediate steps that can be resolved in experiment. From the known excitation energies of states in the SD band, the excitation energy of the (unobserved) SD 0 + band-head can be estimated with a good accuracy [70][71][72][73][74][75]. One of these nuclides is 194 Hg.…”

Section: Superdeformed Minimamentioning

confidence: 99%

Impact of the surface energy coefficient on the deformation properties of atomic nuclei as predicted by Skyrme energy density functionals

et al. 2019

View full text Add to dashboard Cite

Background: In the framework of nuclear energy density functional (EDF) methods, many nuclear phenomena are related to the deformation of intrinsic states. Their accurate modeling relies on the correct description of the change of nuclear binding energy with deformation. The two most important contributions to the deformation energy have their origin in shell effects that are correlated to the spectrum of single-particle states, and the deformability of nuclear matter, that can be characterized by a model-dependent surface energy coefficient a surf .Purpose: With the goal of improving the global performance of nuclear EDFs through the fine-tuning of their deformation properties, the purpose of this study is threefold. First, to analyze the impact of systematic variations of a surf on properties of nuclei; second, to identify observables that can be safely used to narrow down the range of appropriate values of a surf to be targeted in future parameter fits; third, to analyze the interdependence of a surf with other properties of a nuclear EDF.Methods: Results for a large variety of relevant observables of deformed nuclei obtained from self-consistent mean-field calculations with a set of purpose-built SLy5sX parametrizations of the Skyrme EDF are correlated with the value of a surf .Results: The performance of the SLy5sX parametrizations for characteristic energies of the fission barriers of 180 Hg, 226 Ra, and 240 Pu, excitation energies, electromagnetic moments and moments of inertia of superdeformed states in the A ≈ 190 region, properties of shape coexisting states at normal deformation in the Pb, Kr, and Zr region, properties of octupole-deformed 144 Ba, even-even Th isotopes, and 110 Zr, separation energies along isotopic and isotonic chains are compared with available experimental data. Conclusions:The three main conclusions are that there is an evident preference for a comparatively low value of a surf , as expected from the performance of existing parametrizations; that the isospin dependence of the surface energy also needs further fine-tuning in order to describe trends across the chart of nuclei; and that a satisfying simultaneous description of fission barriers and superdeformed states requires a better description of the singleparticle spectra.

show abstract

“…Until now, over 85 SD bands have been identified in 25 isotopes with 79 < Z < 84 in the A ∼ 190 region. Some of the experimentally identified SD bands in this region are in 190,192,194 Hg [61,62,68,69] and 190,192,194,195,196 Pb [63][64][65][70][71][72] isotopes. The existence of superdeformed states and their fundamental properties has been predicted within the different theoretical approaches.…”

Section: Introductionmentioning

confidence: 92%

Triple-shape Coexistence and Superdeformation in Pb Isotopes

Naz¹,

Ahmad²,

Abusara³

2018

Acta Phys. Pol. B

View full text Add to dashboard Cite

Triple-shape coexistence and superdeformation in Pb isotopes with neutron numbers N = 96-138 is studied. The constrained calculations are performed within the Relativistic Hartree-Bogoliubov (RHB) model using DD-ME2, DD-PC1, and NL3* force parameters, and pairing interaction separable in momentum space. Triple-shape coexistence (spherical, prolate and oblate) manifests themselves in a clear manner in 184−190 Pb nuclei with axial RHB calculations. Triaxial RHB calculations further confirm the findings. Superdeformed minimum is observed for 188−220 Pb isotopes, and the corresponding excitation energy, deformation and depth of well are comparable within different force parameters used. The behaviour with neutron number of the superdeformed excitation energy, two-neutron separation energy in the ground state and superdeformed minimum, and its differential are fairly reproducing the trend of the available experimental data. The present numerical results are compared with Macro-microscopic Finite Range Droplet Model (FRDM) and Hartree-Fock-Bogoliubov (HFB) model based on the interaction Gogny-D1S force. Overall, a fairly satisfactory agreement is found within the different force parameters and the calculated and experimental results.

show abstract

Excitation Energies of Superdeformed States inPb196: Towards a Systematic Study of the Second Well in Pb Isotopes

Cited by 20 publications

References 22 publications

Superdeformed multi-quasiparticle high-Kstates and possible isomers in Pb and Po isotopes

Superdeformed multi-quasiparticle high-Kstates and possible isomers in Pb and Po isotopes

Impact of the surface energy coefficient on the deformation properties of atomic nuclei as predicted by Skyrme energy density functionals

Triple-shape Coexistence and Superdeformation in Pb Isotopes

Contact Info

Product

Resources

About