scholarly journals Temperature and Density Conditions for Alpha Clustering in Excited Self-Conjugate Nuclei

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1562
Author(s):  
Bernard Borderie ◽  
Adriana Raduta ◽  
Enrico De Filippo ◽  
Elena Geraci ◽  
Nicolas Le Neindre ◽  
...  
Keyword(s):  
Stellar Evolution ◽  
Experimental Studies ◽  
Mean Field ◽  
Saturation Density ◽  
Self Consistent ◽  
Density Values ◽  
Alpha Clustering

Starting from experimental studies on alpha-clustering in excited self-conjugate nuclei (from 16O to 28Si), temperature and density conditions for such a clustering are determined. Measured temperatures have been found in the range of 5.5–6.0 MeV, whereas density values of 0.3–0.4 times the saturation density are deduced, i.e., 0.046 to 0.062 fm−3. Such a density domain is also predicted by constrained self-consistent mean field calculations. These results constitute a benchmark for alpha clustering from self-conjugate nuclei in relation to descriptions of stellar evolution and supernovae.

scholarly journals Diffusion in CP Stars: The Quest for Accuracy

1998 ◽  
Vol 11 (2) ◽  
pp. 671-673
Author(s):  
G. Alecian
Keyword(s):  
Computational Methods ◽  
Stellar Evolution ◽  
Diffusion Processes ◽  
Stellar Atmospheres ◽  
Time Dependent ◽  
Data Bases ◽  
Self Consistent ◽  
Stellar Envelopes ◽  
Better Than

We present a brief review about recent progresses concerning the study of diffusion processes in CP stars. The most spectacular of them concerns the calculation of radiative accelerations in stellar envelopes for which an accuracy better than 30% can now be reached for a large number of ions. This improvement is mainly due to huge and accurate atomic and opacity data bases available since the beginning of the 90’s. Developments of efficient computational methods have been carried out to take advantage of these new data. These progresses have, in turn, led to a better understanding of how the element stratification is building up with time. A computation of self-consistent stellar evolution models, including time-dependent diffusion, can now be within the scope of the next few years. However, the progresses previously mentioned do not apply for stellar atmospheres and upper layers of envelopes.

scholarly journals Understanding Depletion Induced Like-Charge Attraction from Self-Consistent Field Model

2017 ◽  
Vol 22 (1) ◽  
pp. 95-111 ◽  
Author(s):  
Pei Liu ◽  
Manman Ma ◽  
Zhenli Xu
Keyword(s):  
Mean Field ◽  
Interaction Force ◽  
Systematic Investigation ◽  
Self Consistent ◽  
Self Consistent Field ◽  
Anomalous Feature ◽  
Long Time ◽  
Ionic Size ◽  
Poisson Boltzmann ◽  
Force Calculation

AbstractThe interaction force between likely charged particles/surfaces is usually repulsive due to the Coulomb interaction. However, the counterintuitive like-charge attraction in electrolytes has been frequently observed in experiments, which has been theoretically debated for a long time. It is widely known that the mean field Poisson-Boltzmann theory cannot explain and predict this anomalous feature since it ignores many-body properties. In this paper, we develop efficient algorithm and perform the force calculation between two interfaces using a set of self-consistent equations which properly takes into account the electrostatic correlation and the dielectric-boundary effects. By solving the equations and calculating the pressure with the Debye-charging process, we show that the self-consistent equations could be used to study the attraction between like-charge surfaces from weak-coupling to mediate-coupling regimes, and that the attraction is due to the electrostatics-driven entropic force which is significantly enhanced by the dielectric depletion of mobile ions. A systematic investigation shows that the interaction forces can be tuned by material permittivity, ionic size and valence, and salt concentration, and that the like-charge attraction exists only for specific regime of these parameters.

CURRENTS, SPIN DENSITIES AND MEAN-FIELD FORM FACTORS IN ROTATING NUCLEI: A SEMI-CLASSICAL APPROACH

2004 ◽  
Vol 13 (01) ◽  
pp. 225-233 ◽  
Author(s):  
J. BARTEL ◽  
K. BENCHEIKH ◽  
P. QUENTIN
Keyword(s):  
Mean Field ◽  
Form Factors ◽  
Spin Vector ◽  
Self Consistent ◽  
Field Form ◽  
Local Densities ◽  
The Mean ◽  
Self Consistency ◽  
Spin Densities ◽  
Rotating Nuclei

We present self-consistent semi-classical local densities characterising the structure of rotating nuclei. A particular emphasis is put on those densities which are generated by the breaking of time-reversal symmetry through the cranking piece of the Routhian, namely the current density and the spin vector density. Our approach which is based on the Extended-Thomas-Fermi method goes beyond the Inglis cranking approach and contains naturally the Thouless-Valatin self-consistency terms expressing the response of the mean field to the time-odd part of the density matrix.

Self-Consistent Mean-Field Models and Their Application to Superheavy Nuclei

2004 ◽  
pp. 407-414
Author(s):  
T. J. Bürvenich ◽  
P.-G. Reinhard ◽  
J. A. Maruhn ◽  
W. Greiner
Keyword(s):  
Mean Field ◽  
Superheavy Nuclei ◽  
Mean Field Models ◽  
Self Consistent
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