scholarly journals Two-proton capture on the 68Se nucleus with a new self-consistent cluster model

2018 ◽  
Vol 782 ◽  
pp. 42-46 ◽  
Author(s):  
D. Hove ◽  
E. Garrido ◽  
A.S. Jensen ◽  
P. Sarriguren ◽  
H.O.U. Fynbo ◽  
...  
Keyword(s):  
Cluster Model ◽  
Proton Capture ◽  
Self Consistent

scholarly journals Astrophysical S-factor of the radiative proton capture on 14C at low energies

2014 ◽  
Vol 29 (24) ◽  
pp. 1450125 ◽  
Author(s):  
Sergey Dubovichenko ◽  
Nasurlla Burtebaev ◽  
Albert Dzhazairov-Kakhramanov ◽  
Dilshod Alimov
Keyword(s):  
Ground State ◽  
Cluster Model ◽  
Phase Shift Analysis ◽  
Potential Cluster Model ◽  
Proton Capture ◽  
Position Location ◽  
Capture Reaction ◽  
Shift Analysis ◽  
S Factor ◽  
Low Energies

The phase shift analysis for position location of the [Formula: see text] resonance at 1.5 MeV was carried out on the basis of the known experimental measurements of the excitation functions of the p14 C elastic scattering at four angles from 90° to 165° and more than 100 energy values in the range from 600–800 keV to 2200–2400 keV. Also, the possibility to describe the available experimental data on the astrophysical S-factor for the proton capture reaction on 14 C to the ground state (GS) of 15 N at astrophysical energies was considered in the frame of modified potential cluster model (MPCM).

A self-consistent multi-regge cluster model

1975 ◽  
Vol 99 (3) ◽  
pp. 499-513 ◽  
Author(s):  
E.J. Squires ◽  
D.M. Webber
Keyword(s):  
Cluster Model ◽  
Self Consistent

Molecular-orbital-self-consistent-field cluster model ofH2O adsorption on copper

1985 ◽  
Vol 32 (2) ◽  
pp. 1430-1433 ◽  
Author(s):  
M. W. Ribarsky ◽  
W. D. Luedtke ◽  
Uzi Landman
Keyword(s):  
Molecular Orbital ◽  
Cluster Model ◽  
Consistent Field ◽  
Self Consistent ◽  
Self Consistent Field

Electronic Structure of Pd doped InP

1992 ◽  
Vol 272 ◽  
Author(s):  
P. K. Khowash
Keyword(s):  
Electronic Structure ◽  
Density Of States ◽  
Cluster Model ◽  
Local Density ◽  
Energy Spectra ◽  
Valence Band Edge ◽  
Metal Impurities ◽  
Structure Of Metal ◽  
Self Consistent ◽  
Small Magnetic Moment

ABSTRACTThe electronic structure of metal impurities in III-V semiconductors are interesting because of their ability to create deep centers. We use a spin unrestricted self-consistent local density theory in a cluster model to calculate the charge distributions, one electron energy spectra and the density of states for pure InP and Pd doped InP, substituted at the In site. The pure semiconductor gap is calculated to be 1.44 eV in excellent agreement with the experimental value of 1.41 eV. A small magnetic moment of 0.561μB appears on the Pd site. The impurity introduces a levels of t2 character at 0.01 and 0.04 eV above the valence band edge.

The Mechanism of Slow Component Suppression in Lanthanum Doped Barium Fluoride Crystal

1994 ◽  
Vol 348 ◽  
Author(s):  
Gu Mu ◽  
Chen Lingyan ◽  
Li Qing ◽  
Wang Liming ◽  
Xiang Kaihua
Keyword(s):  
Electronic Structures ◽  
Cluster Model ◽  
Local Density ◽  
Slow Component ◽  
Barium Fluoride ◽  
Molecular Cluster ◽  
Entire System ◽  
Scintillation Light ◽  
Hartree Fock ◽  
Self Consistent

ABSTRACTThe electronic structures of pure BaF2 crystal and lanthanum doped BaF2 crystal have been calculated in a self-consistent molecular-cluster model. The cluster is embedded in the crystal lattice and the entire system treatediteratively in the Hartree-Fock-Slater local-density theory. As lanthanum doped BaF2 is concerned, the obtained results revealed that the F1–i which is introduced by the lanthanum may contribute to the suppression ofthe slow component in the scintillation light of BaF2 crystal.

Surface-Charge Dependent Orientation of Water at the Interface of a Gold Electrode: A Cluster Study

2018 ◽  
Vol 232 (9-11) ◽  
pp. 1583-1592 ◽  
Author(s):  
Gianluca Fazio ◽  
Gotthard Seifert ◽  
Mathias Rapacioli ◽  
Nathalie Tarrat ◽  
Jan-Ole Joswig
Keyword(s):  
Cluster Model ◽  
Gold Electrode ◽  
Density Functional ◽  
Gold Cluster ◽  
Tight Binding ◽  
Periodic Boundary Conditions ◽  
Solvation Shell ◽  
Screening Behavior ◽  
Self Consistent ◽  
Dynamics Simulations

Abstract A gold/water interface has been investigated with the DFT-based self-consistent-charge density-functional tight-binding (SCC-DFTB) method using a cluster model. Born–Oppenheimer molecular-dynamics simulations for mono-, bi-, and trilayers of water on the surface of a Au55 cluster have been computed. We have demonstrated the applicability of this method to the study of the structural and dynamical properties of the gold/water-multilayer interface. The results of the simulations clearly show the charge-dependent orientation and the corresponding polarization of the water sphere around the gold cluster. However, it was also shown that this polarization is restricted almost only to the first solvation shell. This illustrates the rather short-range screening behavior of water. The present study builds the basis for further investigations of metal/electrolyte interfaces on a reliable atomistic level, avoiding the problems of spurious artifacts in models using periodic boundary conditions.

scholarly journals Aluminium abundances in five discrete stellar populations of the globular cluster NGC 2808

2018 ◽  
Vol 615 ◽  
pp. A17 ◽  
Author(s):  
Eugenio Carretta ◽  
Angela Bragaglia ◽  
Sara Lucatello ◽  
Raffaele G. Gratton ◽  
Valentina D’Orazi ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Cluster Formation ◽  
Light Elements ◽  
Atmospheric Parameters ◽  
Proton Capture ◽  
Full Dataset ◽  
Self Consistent ◽  
Red Giant ◽  
Set Up ◽  
First Time

We observed a sample of 90 red giant branch (RGB) stars in NGC 2808 using FLAMES/GIRAFFE and the high resolution grating with the set-up HR21. These stars have previous accurate atmospheric parameters and abundances of light elements. We derived aluminium abundances for them from the strong doublet Al i 8772–8773 Å as in previous works of our group. In addition, we were able to estimate the relative CN abundances for 89 of the stars from the strength of a large number of CN features. When adding self-consistent abundances from previous UVES spectra analysed by our team, we gathered [Al/Fe] ratios for a total of 108 RGB stars in NGC 2808. The full dataset of proton-capture elements is used to explore in detail the five spectroscopically detected discrete components in this globular cluster. We found that various classes of polluters are required to reproduce (anti)-correlations among all proton-capture elements in the populations P2, I1, and I2 with intermediate composition. This is in agreement with the detection of lithium in lower RGB second generation stars, requiring at least two kind of polluters. For chemically homogeneous populations, the best subdivision of our sample is into six components as derived from statistical cluster analysis. By comparing different diagrams [element/Fe] versus [element/Fe], we show for the first time that a simple dilution model is not able to reproduce all the subpopulations in this cluster. Polluters of different masses are required. NGC 2808 is confirmed to be a tough challenge to any scenario for globular cluster formation.

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