scholarly journals Particle ratios within EPOS, UrQMD and thermal models at AGS, SPS and RHIC energies

2021 ◽  
Vol 30 (08) ◽  
Author(s):  
Mahmoud Hanafy ◽  
Abdel Nasser Tawfik ◽  
Muhammad Maher ◽  
Werner Scheinast
Keyword(s):  
Molecular Dynamics ◽  
Phase Transitions ◽  
Hybrid Model ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics ◽  
Thermal Models ◽  
Particle Ratios ◽  
Statistical Ensembles ◽  
The Ideal

The particle ratios [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] measured at AGS, SPS and RHIC energies are compared with large statistical ensembles of 100,000 events deduced from the CRMC EPOS [Formula: see text] and the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) hybrid model. In the UrQMD hybrid model two types of phase transitions are taken into account. All these data are then confronted with the ideal Hadron Resonance Gas Model. The two types of phase transitions are apparently indistinguishable. Apart from [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], the UrQMD hybrid model agrees well with the CRMC EPOS [Formula: see text]. We also conclude that the CRMC EPOS [Formula: see text] seems to largely underestimate [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text].

Relativistic quantum molecular dynamics and the collision 40Ca−40Ca at Elab/A = 1.05 GeV

1991 ◽  
Vol 268 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Tomoyuki Maruyama ◽  
Guoqiang Li ◽  
Amand Faessler
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics

scholarly journals Relativistic hadron-hadron collisions in the ultra-relativistic quantum molecular dynamics model

1999 ◽  
Vol 25 (9) ◽  
pp. 1859-1896 ◽  
Author(s):  
M Bleicher ◽  
E Zabrodin ◽  
C Spieles ◽  
S A Bass ◽  
C Ernst ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics ◽  
Dynamics Model

Structure and Dynamics of Aluminum Clusters

1990 ◽  
Vol 206 ◽  
Author(s):  
J. Bernholc ◽  
Jae-Yel Yi ◽  
Dirk J. Oh ◽  
D. J. Sullivan
Keyword(s):  
Molecular Dynamics ◽  
Quantum Molecular Dynamics ◽  
Aluminum Clusters ◽  
Atom Clusters ◽  
Structure Factors ◽  
Icosahedral Clusters ◽  
Long Time ◽  
Dynamics Simulations ◽  
Large Clusters ◽  
The Ideal

ABSTRACTThe energetics and structures of metallic clusters containing up to 55 atoms are studied by the Car-Parrinello (quantum-molecular dynamics) method with Al chosen as a paradigm. It is found that the structural energy differences between small cluster (icosahedral) and bulk (fee) structures are surprisingly small, indicating that the icosahedron-fee structural transition can occur very early in Al clusters. Simulated annealing studies for 13- and 55-atom clusters, where both perfectly symmetric icosahedral and cuboctahedral (fee) structures exist, show that the distortions from the ideal structures are substantial. For the 55-atom cluster several inequivalent but energetically nearly degenerate structures are found, which is likely to lead to floppiness at finite temperatures as well as a low melting point. Although the structure factors for the annealed structures are nearly identical, they are very different from those of either of the ideal structures. The computed IPs and EAs differ by less than 0.1 eV for weakly annealed cuboctahedral and icosahedral clusters, making the structural identification on the basis of IP and EA measurements very difficult. The quantum-mechanical results are also used to develop a classical potential for long-time molecular dynamics simulations of large clusters.

Bose-Einstein correlations of pion pairs and kaon pairs from relativistic quantum molecular dynamics

1993 ◽  
Vol 70 (20) ◽  
pp. 3000-3003 ◽  
Author(s):  
J. P. Sullivan ◽  
M. Berenguer ◽  
B. V. Jacak ◽  
S. Pratt ◽  
M Sarabura ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics ◽  
Bose Einstein

Relativistic quantum molecular dynamics and eta production in nucleus-nucleus collisions

1992 ◽  
Vol 537 (3-4) ◽  
pp. 631-644 ◽  
Author(s):  
Guo-qiang Li ◽  
Tomoyuri Maruyama ◽  
Y. Lotfy ◽  
S.W. Huang ◽  
Dao Tien Khoa ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics

Azimuthal structure of charged particle emission in 28Si–Ag/Br interaction at 14.5A GeV and 32S–Ag/Br interaction at 200A GeV

2014 ◽  
Vol 23 (05) ◽  
pp. 1450027 ◽  
Author(s):  
Provash Mali ◽  
Amitabha Mukhopadhyay ◽  
Soumya Sarkar ◽  
Gurmukh Singh
Keyword(s):  
Molecular Dynamics ◽  
Relativistic Quantum ◽  
Particle Emission ◽  
Photographic Emulsion ◽  
Quantum Molecular Dynamics ◽  
Emission Data ◽  
Shock Wave Formation ◽  
A Charge ◽  
Bose Einstein ◽  
Charged Particle Emission

Presence of unusual azimuthal structures in the particle emission data obtained from the 28 Si – Ag / Br interaction at 14.5A GeV and from the 32 S – Ag / Br interaction at 200A GeV, are investigated in the framework of the Cherenkov gluon emission and/or Mach shock wave formation in nuclear/partonic medium. Nuclear photographic emulsion technique is used to collect the experimental data. The experiment is compared with the predictions of two simulations, namely (i) the Relativistic Quantum Molecular Dynamics (RQMD) and (ii) the Ultra-relativistic Quantum Molecular Dynamics (UrQMD). A charge reassignment algorithm is implemented over the outputs of the simulations to mimic the Bose–Einstein correlation (BEC) effect. Our analysis confirms presence of jet-like structures in both experiments beyond statistical noise. Such structures are more pronounced in the 32 S data than in the 28 Si data.

scholarly journals Thermal analysis of hadron multiplicities from relativistic quantum molecular dynamics

1999 ◽  
Vol 59 (3) ◽  
pp. 1637-1645 ◽  
Author(s):  
J. Sollfrank ◽  
U. Heinz ◽  
H. Sorge ◽  
N. Xu
Keyword(s):  
Molecular Dynamics ◽  
Thermal Analysis ◽  
Relativistic Quantum ◽  
Quantum Molecular Dynamics
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