Search results for "Nuclear density functional theory"

showing 5 items of 15 documents

Nuclear Energy Density Optimization: UNEDF2

2014

The parameters of the UNEDF2 nuclear energy density functional (EDF) model were obtained in an optimization to experimental data consisting of nuclear binding energies, proton radii, odd-even mass staggering data, fission-isomer excitation energies, and single particle energies. In addition to parameter optimization, sensitivity analysis was done to obtain parameter uncertainties and correlations. The resulting UNEDF2 is an all-around EDF. However, the sensitivity analysis also demonstrated that the limits of current Skyrme-like EDFs have been reached and that novel approaches are called for.

Physics[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]skyrme energy densityNuclear Theory[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]ta114nuclear density functional theoryNuclear TheoryFOS: Physical sciencesLibrary scienceOak Ridge National Laboratory7. Clean energyNuclear Theory (nucl-th)Nuclear physicsEnergy densityNational laboratoryComputer Science::Operating SystemsNuclear theory
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β and γ bands in N = 88, 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory…

2019

A comprehensive systematic study is made for the collective β and γ bands in even-even isotopes with neutron numbers N=88 to 92 and proton numbers Z=62(Sm) to 70 (Yb). Data, including excitation energies, B(E0) and B(E2) values, and branching ratios from previously published experiments are collated with new data presented for the first time in this study. The experimental data are compared to calculations using a five-dimensional collective Hamiltonian (5DCH) based on the covariant density functional theory (CDFT). A realistic potential in the quadrupole shape parameters V(β,γ) is determined from potential energy surfaces (PES) calculated using the CDFT. The parameters of the 5DCH are fixe…

electromagnetic transitionsnuclear density functional theorynuclear spin and paritynucleon induced nuclear reactionscollective levelscollective modelslow and intermediate energy heavy-ion reactionsydinfysiikka
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Prompt and delayed spectroscopy of 203At : Observation of a shears band and a 29/2+ isomeric state

2018

Using fusion-evaporation reactions, a gas-filled recoil separator, recoil-gating technique and recoil-isomer decay tagging technique we have extended the level scheme of 203 At ( N = 118 ) significantly. We have observed an isomeric [ τ = 14.1 ( 3 ) μ s ] state with a spin and parity of 29 / 2 + . The isomeric state is suggested to originate from the π ( h 9 / 2 ) ⊗ ∣ ∣ 202 Po ; 11 − ⟩ coupling, and it is depopulated through 286 keV E 2 and 366 keV E 3 transitions. In addition, we have observed a cascade of magnetic-dipole transitions which is suggested to be generated by the shears mechanism. peerReviewed

level densitiesnuclear spinelectromagnetic transitionsnuclear density functional theorytiheysfunktionaaliteoriaspektroskopialifetimeswidthsenergy levelsNuclear Experimentisomer decaysydinfysiikkanuclear parity
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Correlating Schiff Moments in the Light Actinides with Octupole Moments

2018

nuclear many-body theoryta114nuclear density functional theoryydinfysiikkanuclear structure and decaysnuclear tests of fundamental interactionsPhysical Review Letters
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Uncertainty analysis and symmetry restoration in nuclear self-consistent methods

2015

This thesis contains two articles, in the following denoted by I and II, and an introduction to them. In Chapter 1, I present the theoretical models of nuclear structure. In Chapter 2, I introduce the basic ideas about the density functional theory (DFT) and self-consistent mean-field (SCMF) calculations. In Chapter 3, I give the formulae for the uncertainty propagation, which is the error analysis method used in article I. As a proper tool to survey the predictive power of theoretical models, the error analysis now has become more and more widely used. By analyzing the propagation of uncertainties, one tries to find out the e ectiveness of the calculation with a given parameter set obtaine…

symmetriaydinrakenneenergiatiheysfunktionaalitnuclear density functional theorytiheysfunktionaaliteorianuclear structurepropagation of uncertaintyenergy-density-functionalssymmetry restorationmatemaattiset mallitydinfysiikkavirheanalyysi
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