CALCULATION OF GIANT RESONANCE WIDTHS FROM DAMPED SINGLE PARTICLE MOTION

1992 ◽  
Vol 01 (04) ◽  
pp. 833-844 ◽  
Author(s):  
YING-CAI WANG ◽  
F. E. SERR ◽  
E. J. MONIZ ◽  
N. TERUYA ◽  
H. DIAS ◽  
...  
Keyword(s):  
Single Particle ◽  
Particle Motion ◽  
Qualitative Agreement ◽  
Optical Potential ◽  
Giant Resonance ◽  
Low Energy ◽  
Hole State ◽  
Giant Resonances ◽  
Vertex Corrections ◽  
Quadrupole Resonance

The spreading and escape widths of giant resonances are evaluated by considering damped particle and hole propagation in the nucleus. The magnitude and averaged A-dependence of the isoscalar quadrupole resonance widths are reproduced qualitatively when the nucleon optical potential, fit globally to low-energy scattering, is used to damp nucleon motion. Contributions from hole state widths and from vertex corrections increase and decrease the giant resonance widths, respectively. Qualitative agreement with experimental widths is shown for 16 O , 40 Ca and 208 Pb . Comparison with recent calculations within continuum RPA is made.

scholarly journals Single-particle motion under the influence of the perpendicular ponderomotive force

1987 ◽  
Vol 37 (3) ◽  
pp. 497-506
Author(s):  
M. C. Festeau-Barrioz ◽  
M. L. Sawley ◽  
J. Václavík
Keyword(s):  
Electromagnetic Field ◽  
Single Particle ◽  
Particle Motion ◽  
Ponderomotive Force ◽  
Equation Of Motion ◽  
Exact Equation ◽  
Particle Theory ◽  
Magnetostatic Field ◽  
Single Particle Motion

The motion of a single particle under the influence of the ponderomotive force directed perpendicular to the external magnetostatic field is analysed. By solving the exact equation of motion for a specific applied electromagnetic field, the resultant ponderomotive drift is compared with the prediction of a single-particle theory using the oscillation-centre approximation. The regime of validity of this theory is discussed. It is shown that, for certain values of the amplitude and frequency of the electromagnetic field, the particle motion is unstable and therefore the concept of a single-particle ponderomotive force is meaningless.

Comment on "Kinetic theory of single-particle motion in a fluid"

1979 ◽  
Vol 19 (1) ◽  
pp. 416-418 ◽  
Author(s):  
H. van Beijeren ◽  
J. R. Dorfman
Keyword(s):  
Kinetic Theory ◽  
Single Particle ◽  
Particle Motion ◽  
Single Particle Motion

scholarly journals Importance of Giant-Resonance Excitation for the Surface Properties of the Heavy-Ion Optical Potential

1989 ◽  
Vol 9 (2) ◽  
pp. 125-131 ◽  
Author(s):  
Ph Chomaz ◽  
Y Blumenfeld ◽  
M. V Andrés ◽  
F Catara ◽  
E. G Lanza
Keyword(s):  
Surface Properties ◽  
Optical Potential ◽  
Giant Resonance ◽  
Heavy Ion ◽  
Resonance Excitation

Diabatic aspects of single-particle motion within the time-dependent Hartree-Fock theory

1983 ◽  
Vol 314 (3) ◽  
pp. 309-316 ◽  
Author(s):  
W. Cassing ◽  
A. K. Dhar ◽  
A. Lukasiak ◽  
W. N�renberg
Keyword(s):  
Single Particle ◽  
Particle Motion ◽  
Time Dependent ◽  
Hartree Fock ◽  
Single Particle Motion

Single-Particle Motion in One Dimension

2020 ◽  
pp. 29-60
Author(s):  
Christopher W. Kulp ◽  
Vasilis Pagonis
Keyword(s):  
Single Particle ◽  
Particle Motion ◽  
One Dimension ◽  
Single Particle Motion

scholarly journals Numerical Analysis of Single-Particle Motion Using CFD-DEM in Varying-Curvature Elbows

2022 ◽  
Vol 10 (1) ◽  
pp. 62
Author(s):  
Chao Ning ◽  
Yalin Li ◽  
Ping Huang ◽  
Hongbo Shi ◽  
Haichao Sun
Keyword(s):  
Single Particle ◽  
Particle Motion ◽  
Numerical Study ◽  
Area Ratio ◽  
Centrifugal Pumps ◽  
Distribution Law ◽  
Two Phase ◽  
Curvature Ratio ◽  
Critical Components ◽  
Solid Liquid

Centrifugal pumps are the critical components in deep-sea mining. In order to investigate the particle motion in the curved channel of the impeller, three different types of curvature conform to blade profile to simplify the impeller design of pumps. A numerical study is conducted to investigate the flow field in a varying-curvature channel for solid-liquid two-phase flow. The flow of particles within the varying curvature channel is studied by combining the discrete element method (DEM) with computational fluid dynamics (CFD) and a comparison with Particle Image Velocimetry (PIV) test results. The results show that a polyhedral mesh with a small mesh number yields very accurate results, which makes it very suitable for CFD-DEM. Based on this method, the movement of a single particle is compared and analyzed, and the particle-motion law is obtained. The effects of the curvature ratio Cr and area ratio Ar on the motion law for a single particle are studied, and the simulation results are analyzed statistically. The results show that the effect of Cr on both the particle slip velocity and the turbulent kinetic energy only changes its strength, while the distribution law does not change significantly. Compared with the curvature ratio Cr, the area ratio Ar has a greater impact on the particles, and its distribution law becomes clearly different. As the area ratio Ar increases, the arc radius and length of the corresponding particle trajectory decrease.

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