Modified Langevin Equation and Energy Dissipation in Heavy Ion Collisions.

1989 ◽  
Vol 2 (1) ◽  
pp. 39-43
Author(s):  
Premtosh Majumdar ◽  
Probhas Raychaudhuri
Keyword(s):  
Energy Dissipation ◽  
Langevin Equation ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions

FRAGMENTATION CROSS SECTIONS IN HEAVY ION COLLISIONS

2008 ◽  
Vol 17 (09) ◽  
pp. 1927-1936
Author(s):  
BAO-AN BIAN ◽  
FENG-SHOU ZHANG ◽  
HONG-YU ZHOU
Keyword(s):  
Cross Sections ◽  
Langevin Equation ◽  
Heavy Ion Collisions ◽  
Production Cross ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Target Mass

The fragment cross sections are calculated for reactions of Ne collisions with C , Al , Cu , Sn , Ta , and Pb targets at 600 Mev/nucleon using the the isospin-dependent Boltzmann-Langevin equation. We found that the production cross sections for fragments Z = 2 to 9 are qualitatively reproduced by the present calculations except for C target. In order to understand the effects of heavy ion interaction with biomolecules well, we calculate the fragmentation cross sections for reactions of 12 C + 2 H , 12 C , 14 N , 16 O at beam energies from 50 to 100 MeV/nucleon. It is found that fragment species increase approximately with increasing target mass. The obvious increment of the fragment cross sections for heavier targets at the beam energies from 50 to 80 MeV/nucleon are shown.

scholarly journals Effect of shell structure on energy dissipation in heavy-ion collisions

2000 ◽  
Vol 8 (1) ◽  
pp. 115-124 ◽  
Author(s):  
R. V. Jolos ◽  
A. K. Nasirov ◽  
G. G. Adamian ◽  
A. I. Muminov
Keyword(s):  
Energy Dissipation ◽  
Shell Structure ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions

scholarly journals Nonequilibrium Dynamics of the Chiral Quark Condensate under a Strong Magnetic Field

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 551
Author(s):  
Gastão Krein ◽  
Carlisson Miller
Keyword(s):  
Magnetic Field ◽  
Time Evolution ◽  
Strong Magnetic Field ◽  
Early Universe ◽  
Langevin Equation ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Quark Condensate ◽  
Damping Coefficient ◽  
Ion Collisions

Strong magnetic fields impact quantum-chromodynamics (QCD) properties in several situations; examples include the early universe, magnetars, and heavy-ion collisions. These examples share a common trait—time evolution. A prominent QCD property impacted by a strong magnetic field is the quark condensate, an approximate order parameter of the QCD transition between a high-temperature quark-gluon phase and a low-temperature hadronic phase. We use the linear sigma model with quarks to address the quark condensate time evolution under a strong magnetic field. We use the closed time path formalism of nonequilibrium quantum field theory to integrate out the quarks and obtain a mean-field Langevin equation for the condensate. The Langevin equation features dissipation and noise kernels controlled by a damping coefficient. We compute the damping coefficient for magnetic field and temperature values achieved in peripheral relativistic heavy-ion collisions and solve the Langevin equation for a temperature quench scenario. The magnetic field changes the dissipation and noise pattern by increasing the damping coefficient compared to the zero-field case. An increased damping coefficient increases fluctuations and time scales controlling condensate’s short-time evolution, a feature that can impact hadron formation at the QCD transition. The formalism developed here can be extended to include other order parameters, hydrodynamic modes, and system’s expansion to address magnetic field effects in complex settings as heavy-ion collisions, the early universe, and magnetars.

scholarly journals Energy Dissipation and the Stochastic Process in Heavy-Ion Collisions

1980 ◽  
Vol 63 (6) ◽  
pp. 2119-2122 ◽  
Author(s):  
H. Matsuzaki ◽  
C. Ishii ◽  
T. Honda ◽  
T. Tsukamoto
Keyword(s):  
Stochastic Process ◽  
Energy Dissipation ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions

Energy dissipation in heavy-ion collisions

1980 ◽  
Vol 28 (17) ◽  
pp. 588-592
Author(s):  
K. Taki ◽  
T. Suzuki
Keyword(s):  
Energy Dissipation ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions
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