Search results for "Funk"
showing 10 items of 623 documents
Impact of the surface energy coefficient on the deformation properties of atomic nuclei as predicted by Skyrme energy density functionals
2018
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 asurf. Purpose: With the goal of improving the global performance of nuclear EDFs through the fine-tuning of their deformation properties, the purpose …
Beta-Decay Studies in N ≈ Z Nuclei Using No-Core Configuration-Interaction Model
2015
The no-core configuration-interaction model based on the isospin- and angular-momentum projected density functional formalism is introduced. Two applications of the model are presented: (i) determination of spectra of 0+ states in 62Zn and (ii) determination of isospin-symmetry-breaking corrections to superallowed β-decay between isobaric-analogue 0+ states in 38Ca and 38K. It is shown that, without readjusting a single parameter of the underlying Skyrme interaction, in all three nuclei, the model reproduces the 0+ spectra surprisingly well. peerReviewed
Model nuclear energy density functionals derived from ab initio calculations
2020
We present the first application of a new approach, proposed in [Journal of Physics G: Nuclear and Particle Physics, 43, 04LT01 (2016)] to derive coupling constants of the Skyrme energy density functional (EDF) from ab initio Hamiltonian. By perturbing the ab initio Hamiltonian with several functional generators defining the Skyrme EDF, we create a set of metadata that is then used to constrain the coupling constants of the functional. We use statistical analysis to obtain such an ab initio-equivalent Skyrme EDF. We find that the resulting functional describes properties of atomic nuclei and infinite nuclear matter quite poorly. This may point out to the necessity of building up the ab init…
Isospin-symmetry breaking in masses of ≃ Nuclei
2018
Effects of the isospin-symmetry breaking (ISB) beyond mean-field Coulomb terms are systematically studied in nuclear masses near the N=Z line. The Coulomb exchange contributions are calculated exactly. We use extended Skyrme energy density functionals (EDFs) with proton–neutron-mixed densities, to which we add new terms breaking the isospin symmetry. Two parameters associated with the new terms are determined by fitting mirror and triplet displacement energies (MDEs and TDEs) of isospin multiplets. The new EDFs reproduce MDEs for the T=12 doublets and T=1 triplets, and TDEs for the T=1 triplets. Relative strengths of the obtained isospin-symmetry-breaking terms are not consistent with the d…
Solution of universal nonrelativistic nuclear DFT equations in the Cartesian deformed harmonic-oscillator basis. (IX) HFODD (v3.06h) : a new version …
2021
We describe the new version (v3.06h) of the code HFODD that solves the universal nonrelativistic nuclear DFT Hartree-Fock or Hartree-Fock-Bogolyubov problem by using the Cartesian deformed harmonic-oscillator basis. In the new version, we implemented the following new features: (i) zero-range three- and four-body central terms, (ii) zero-range three-body gradient terms, (iii) zero-range tensor terms, (iv) zero-range isospin-breaking terms, (v) finite-range higher-order regularized terms, (vi) finite-range separable terms, (vii) zero-range two-body pairing terms, (viii) multi-quasiparticle blocking, (ix) Pfaffian overlaps, (x) particle-number and parity symmetry restoration, (xi) axializatio…
Precision measurement of the magnetic octupole moment in 45Sc as a test for state-of-the-art atomic- and nuclear-structure theory
2020
We report on measurements of the hyperfine $A, B$ and $C$-constants of the $3d4s^2 ~^2D_{5/2}$ and $3d4s^2 ~^2D_{3/2}$ atomic states in $^{45}$Sc. High-precision atomic calculations of the hyperfine fields of these states and second-order corrections are performed, and are used to extract $C_{5/2}=-0.06(6)$ kHz and $C_{3/2}=+0.04(3)$ kHz from the data. These results are one order of magnitude more precise than the available literature. From the combined analysis of both atomic states, we infer the nuclear magnetic octupole moment $\Omega = -0.07(53) \mu_N b$, including experimental and atomic structure-related uncertainties. With a single valence proton outside of a magic calcium core, scan…
Oksidatīvās fosforilēšanas sistēmas funkcionalitātes novērtēšana, izmantojot citoplazmātisko hibrīdu šūnu modeļus
2020
Mitohondriju iekšējā membrānā ir izvietoti pieci enzīmu kompleksi, kas veido oksidatīvās fosforilēšanas (OXPHOS) sistēmu. OXPHOS sistēma saražo līdz pat 90% adenozīntrifosfāta šūnās. Mitohondriālās DNS (mtDNS) mutāciju izraisīti traucējumi OXPHOS sistēmā var izraisīt smagas mitohondriālās slimības. Mitohondriālo slimību diagnosikā nav vienas konkrētas metodes. Patogēno mtDNS mutāciju ietekmi var pētīt izmantojot citoplazmatisko hibrīdu šūnu modeļus. Darba mērķis ir novērtēt OXPHOS funkcionalitāti citoplazmatisko hibrīdu šūnu līniju kontroles grupā un pacienta šūnu līnijā ar iespējami patogēnu mtDNS mutāciju. Tika izveidota šūnu līniju kontroles grupa un noteiktas OXPHOS enzīmu aktivitātes, …
Ultrastrong Coupling of a Single Molecule to a Plasmonic Nanocavity: A First-Principles Study
2022
| openaire: EC/H2020/838996/EU//RealNanoPlasmon Funding Information: We acknowledge financial support from the Swedish Research Council (VR Miljö, Grant No: 2016-06059), the Knut and Alice Wallenberg Foundation (Grant No: 2019.0140), the Polish National Science Center (projects 2019/34/E/ST3/00359 and 2019/35/B/ST5/02477). T.P.R. acknowledges support from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 838996 and support from the Academy of Finland under the Grant No. 332429. T.J.A. acknowledges support from the Project HPC-EUROPA3 (INFRAIA-2016-1-730897), with the support of the EC Research Innovation Action under the H…
Indikatori piekrastes lagūnu biotopu struktūras un funkciju novērtēšanai
2015
Indikatori piekrastes lagūnu biotopu struktūras un funkciju novērtēšanai Laura Ločmele. 2015. Piejūras mitrāju biotopu kompleksi Latvijā ir reti sastopami.Šī iemesla dēļ veikts pētījums ar mērķi novērtēt piejūras lagūnu stāvokli un noskaidrot to kvalitāti raksturojošos indikatorus. Lauka apstākļos tika ievākti dati par ūdens ķīmiskajiem parametriem, lagūnu floru un veģetāciju. Ar attālās izpētes palīdzību, iegūti dati par veģetācijas struktūru un lagūnu ģeogrāfiskajiem parametriem. Galvenās darbā izmanotās datu apstrādes metodes bija PCA, TWINSPAN un korelācijas analīze. Tika veikta lagūnu kvalitātes novērtēšana, balstoties uz to struktūras un funkciju indikatoriem. Pētījumā tika secināts, …
Funkcijas jēdziens pamatskolā skolēniem ar mācīšanās traucējumiem vispārizglītojošās klasēs
2019
Funkcijas jēdziens pamatskolā skolēniem ar mācīšanās traucējumiem vispārizglītojošajās klasēs. Dita Augule, darba vadītājs asoc. prof. Jānis Mencis. Darbā aplūkots mācību saturs pamatskolā tematā “Funkcijas”un mācīšanās traucējumu jēdziens. Apkopota Latvijas pedagogu pieredze darbā ar skolēniem ar mācīšanās traucējumiem vispārizglītojošās klasēs un izveidoti ieteikumi mācību procesa pielāgošanai skolēniem ar mācīšanās traucējumiem vispārizglītojošajās klasēs. Darba mērķis: apzināt metodes, kā pielāgot mācību procesu pamatskolā skolēniem ar mācīšanās traucējumiem vispārizglītojošās klasēs. Darba uzdevumi: 1.apkopot teorētisko informāciju par mācīšanās traucējumiem; 2.apzināt Latvijā strādājo…