Structure of transactinide nuclei with relativistic energy density functionals

Prassa, V.; Nikšić, Tamara; Vretenar, Dario

doi:10.1103/physrevc.88.044324

Cited by 32 publications

(30 citation statements)

References 49 publications

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“…However, such a study requires tremendous computational power. This is also illustrated by the fact that within the covariant and Gogny DFTs, so far, only a limited set of superheavy nuclei has been studied in the triaxial Hartree-Bogoliubov framework [12,37,57]. The computational challenge becomes especially large in the case of the analysis of systematic theoretical uncertainties because the same nucleus has to be calculated within the TRHB framework for several CEDFs.…”

Section: Systematic Theoretical Uncertainties In the Description Omentioning

confidence: 99%

Assessing theoretical uncertainties in fission barriers of superheavy nuclei

et al. 2017

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Theoretical uncertainties in the predictions of inner fission barrier heights in superheavy elements have been investigated in a systematic way for a set of state-of-the-art covariant energy density functionals which represent major classes of the functionals used in covariant density functional theory. They differ in basic model assumptions and fitting protocols. Both systematic and statistical uncertainties have been quantified where the former turn out to be larger. Systematic uncertainties are substantial in superheavy elements and their behavior as a function of proton and neutron numbers contains a large random component. The benchmarking of the functionals to the experimental data on fission barriers in the actinides allows to reduce the systematic theoretical uncertainties for the inner fission barriers of unknown superheavy elements. However, even then they on average increase on moving away from the region where benchmarking has been performed. In addition, a comparison with the results of non-relativistic approaches is performed in order to define full systematic theoretical uncertainties over the state-of-the-art models. Even for the models benchmarked in the actinides, the difference in the inner fission barrier height of some superheavy elements reaches 5 − 6 MeV. This uncertainty in the fission barrier heights will translate into huge (many tens of the orders of magnitude) uncertainties in the spontaneous fission half-lives.

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Section: Systematic Theoretical Uncertainties In the Description Omentioning

confidence: 99%

Assessing theoretical uncertainties in fission barriers of superheavy nuclei

et al. 2017

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“…Details of the calculation and the choice of effective interactions in the particle-hole (DD-PC1 [40]) and particle-particle (a pairing force separable in momentum space [41,42]) channels, are given in Refs. [1,35]. The energy surfaces of Hs isotopes, already reported in [1], display pronounced prolate axial minima (y Rs 0°) near N = 162, and the evolution of ysoftness with increasing neutron number.…”

Section: Introductionmentioning

confidence: 85%

“…[1] we used a microscopic theoretical framework based on relativistic energy density functionals (REDFs) to analyze shape evolution, collective excitation spectra, and decay properties of transactinide nuclei. Axially symmetric and triaxial relativistic Hartree-Bogoliubov (RHB) calculations [36,39], based on the functional DD-PC1 [40] and with a separable pairing force of finite range [41,42], were carried out for the even-even isotopic chains between Fm and FI.…”

Section: Introductionmentioning

confidence: 99%

“…Theoretical studies of quasiparticle excitations in the region of transactinide nuclei have been based on the microscopicmacroscopic approach [13][14][15][16][17][18][19][20][21][22][23][24], self-consistent models with Skyrme functionals [25][26][27][28][29][30], the Gogny force [31][32][33], and relativistic energy density functionals [1,[34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

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High-Kisomers in transactinide nuclei close toN=162

et al. 2015

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We extend our recent study of shape evolution, collective excitation spectra, and decay properties of transactinide nuclei [V. Prassa, T. Niksic, and D. Vretenar, Phys. Rev. C 88, 044324 (2013)], based on the microscopic framework of relativistic energy density functionals, to two-quasiparticle (2qp) excitations in the axially deformed Rf, Sg, Hs, and Ds isotopes, with neutron number N = 160-166. The evolution of high-A" isomers is analyzed in a self-consistent axially symmetric relativistic Hartree-Bogoliubov calculation using the blocking approximation with time-reversal symmetry breaking. The occurrence of a series of low-energy high-A" isomers is predicted, in particular the 9,7 in the N = 160 and N = 166 isotopes, and the 127 in the N = 164 nuclei. The effect of the N = 162 deformed-shell closure on the excitation of 2qp states is discussed. In the N = 162 isotones we find a relatively low density of 2qp states, with no two-neutron states below 1.6 MeV excitation energy and two-proton states at ^0.5 MeV higher energy than the lowest 2qp states in neighboring isotopes. This is an interesting result that can be used to characterise the occurrence of deformed shell gaps in very heavy nuclei.

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“…This demonstrates a clear link between the internal structure of the nucleon and fundamental properties of atomic nuclei. Models of nuclei in the region above Z = 100 can be divided into two classes [10], mean field models with effective density dependent interactions in the Hartree-Fock approximation [11][12][13][14][15][16][17], and macro-microscopic models based on the liquid-drop model combined with Strutinskytype shell corrections (see e.g. [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Superheavy Nuclei in the Quark-Meson-Coupling Model

2017

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Abstract. We present a selection of the first results obtained in a comprehensive calculation of ground state properties of even-even superheavy nuclei in the region of 96 < Z < 136 and 118 < N < 320 from the QuarkMeson-Coupling model (QMC). Ground state binding energies, the neutron and proton number dependence of quadrupole deformations and Q α values are reported for even-even nuclei with 100 < Z < 136 and compared with available experimental data and predictions of macro-microscopic models. Predictions of properties of nuclei, including Q α values, relevant for planning future experiments are presented.

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Structure of transactinide nuclei with relativistic energy density functionals

Cited by 32 publications

References 49 publications

Assessing theoretical uncertainties in fission barriers of superheavy nuclei

Assessing theoretical uncertainties in fission barriers of superheavy nuclei

High-Kisomers in transactinide nuclei close toN=162

Superheavy Nuclei in the Quark-Meson-Coupling Model

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