scholarly journals Rapidity distribution as a probe for elliptical flow at intermediate energies

Open Physics ◽  
2011 ◽  
Vol 9 (4) ◽  
Author(s):  
Sanjeev Kumar ◽  
Varinderjit Kaur ◽  
Suneel Kumar
Keyword(s):  
Heavy Ion ◽  
Rapidity Distribution ◽  
Quantum Molecular Dynamics ◽  
Intermediate Energies ◽  
Ion Collisions ◽  
Expansion Time ◽  
Elliptical Flow ◽  
Rapidity Distributions ◽  
The Spectator ◽  
Iqmd Model

AbstractThe interplay between spectator and participant matter in heavy-ion collisions is investigated within the isospin-dependent quantum molecular dynamics (IQMD) model in terms of the rapidity distribution of light charged particles. The effect of different types and sizes of rapidity distributions is studied in elliptical flow. The elliptical-flow patterns show the important role of nearby spectator matter on the participant zone. This role is further explained on the basis of the passing time of the spectator and the expansion time of the participant zone. The transition from in-plane to out-of-plane emission is observed only when the mid-rapidity region is included into the rapidity bin. Otherwise no transition occurs. The transition energy is found to be highly sensitive to the size of the rapidity bin, while it is only weakly dependent on the type of the rapidity distribution. These theoretical findings are found to be in agreement with experimental results.

On the rapidity distribution of nucleons participating in elliptical flow at intermediate energies

2016 ◽  
Vol 32 (01) ◽  
pp. 1750001 ◽  
Author(s):  
Kamaldeep Kaur ◽  
Suneel Kumar
Keyword(s):  
Cross Section ◽  
Transition Energy ◽  
Nucleon Nucleon ◽  
Intermediate Energy ◽  
Rapidity Distribution ◽  
Quantum Molecular Dynamics ◽  
Intermediate Energies ◽  
Wide Range ◽  
Elliptical Flow ◽  
Iqmd Model

The distribution of nucleons participating in elliptical flow is studied for the reactions of [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] using isospin-dependent quantum molecular dynamics (IQMD) model for various centrality ranges and over the wide range of intermediate energy. Our findings reveal that the sigma (width) of rapidity distribution obtained varies with mass of colliding system at a given energy. The peak of rapidity distribution decreases with decrease in the mass of colliding nuclei. Transition energy as well as width of rapidity distribution depends on the mass of fragment for a given centrality. Influence of isospin dependent symmetry energy and nucleon–nucleon cross-section can be studied using rapidity distribution. Second transition energy depends on the mass of the fragment. Rotational phenomenon of nucleons can be observed for nucleons participating in elliptical flow.

TRANSVERSE MASS SPECTRA AND RAPIDITY DISTRIBUTIONS OF K+ IN NI–NI COLLISIONS AT 1.93 A GeV

2013 ◽  
Vol 28 (16) ◽  
pp. 1350070 ◽  
Author(s):  
PORNRAD SRISAWAD ◽  
ANANYA SUKSRI ◽  
SIRICHAI PHOLWIANG ◽  
ANTONY HARFIELD ◽  
YU-MING ZHENG ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Heavy Ion ◽  
Hadronic Matter ◽  
Transverse Mass ◽  
Quantum Molecular Dynamics ◽  
Medium Effects ◽  
Nuclear Equation Of State ◽  
Intermediate Energies ◽  
Ion Collisions ◽  
Rapidity Distributions

In heavy-ion collisions, the production of kaon at intermediate energies provides a sensitive probe to study the in-medium properties of hadrons. Properties of kaons in dense hadronic matter are important for a better understanding of both the possible restoration of chiral symmetry in dense hadronic matter and the properties of nuclear matter at high densities. In this paper, the in-medium effects and nuclear equation of state (EOS) are studied by analyzing the transverse mass spectra and rapidity distributions of the produced K+ mesons in [Formula: see text] collisions at 1.93 A GeV using the quantum molecular dynamics (QMD) model. The work reveals that the KaoS data favor a repulsive in-medium K+N potential (its value at saturation density ρ0 is (Uk(ρ0) ≈30 MeV ). It is also found that the transverse mass spectra and rapidity distributions of K+ mesons are sensitive to the nuclear EOS.

scholarly journals Quantifying the Effect of Initial Fluctuations on Isospin-Sensitive Observables from Heavy-Ion Collisions at Intermediate Energies

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2172
Author(s):  
Yongjia Wang ◽  
Zepeng Gao ◽  
Qingfeng Li
Keyword(s):  
Symmetry Energy ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Yield Ratio ◽  
Quantum Molecular Dynamics ◽  
Intermediate Energies ◽  
Ion Collisions ◽  
Protons And Neutrons ◽  
Charged Pions ◽  
Sensitive Observables

Initial fluctuation is one of the ingredients that washes fingerprints of the nuclear symmetry energy on observables in heavy-ion collisions. By artificially using the same initial nuclei in all collision events, the effect of the initial fluctuation on isospin-sensitive observables, e.g., the yield ratio of free neutrons with respect to protons Nn/Np, 3H/3He yield ratio, the yield ratio between charged pions π−/π+, and the elliptic flow ratio or difference between free neutrons and protons v2n/v2p (v2n-v2p), are studied within the ultrarelativistic quantum molecular dynamics (UrQMD) model. In practice, Au + Au collisions with impact parameter b = 5 fm and beam energy Elab = 400 MeV/nucleon are calculated. It is found that the effect of the initialization on the yields of free protons and neutrons is small, while for the yield of pions, the directed and elliptic flows are found to be apparently influenced by the choice of initialization because of the strong memory effects. Regarding the isospin-sensitive observables, the effect of the initialization on Nn/Np and 3H/3He is negligible, while π−/π+ and v2n/v2p (v2n-v2p) display a distinct difference among different initializations. The fingerprints of symmetry energy on π−/π+ and v2n/v2p can be either enhanced or reduced when different initializations are utilized.

scholarly journals Particle Production in Heavy Ion Collisions at Intermediate Energies

2020 ◽  
Vol 15 ◽  
pp. 202
Author(s):  
V. Prassa ◽  
T. Gaitanos ◽  
H. H. Wolter ◽  
G. A. Lalazissis ◽  
M. Di Toro
Keyword(s):  
Cross Sections ◽  
Heavy Ion Collisions ◽  
Particle Production ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Intermediate Energies ◽  
Ion Collisions ◽  
Particle Ratios ◽  
Rapidity Distributions ◽  
Medium Modifications

We investigate the influence of the in-medium modifications of nucleon-nucleon cross sections on the particle production in heavy ion collisions at intermediate energies. In particular, it is shown that the pion and kaon yields and their rapidity distributions are strongly affected by the density dependence of the inelastic cross sections. On the other hand, the particle ratios depend less on the in-medium behavior of the inelastic cross sections.

THE HYDRODYNAMIC DESCRIPTION OF THE ENERGY AND CENTRALITY DEPENDENCES OF THE PSEUDORAPIDITY DISTRIBUTIONS OF THE PRODUCED CHARGED PARTICLES IN Au+Au COLLISIONS

2013 ◽  
Vol 22 (09) ◽  
pp. 1350069 ◽  
Author(s):  
ZHIJIN JIANG ◽  
QINGGUANG LI ◽  
GUANXIANG JIANG
Keyword(s):  
Hydrodynamic Model ◽  
Charged Particles ◽  
Heavy Ion ◽  
High Energy ◽  
Hydrodynamic Description ◽  
Gaussian Form ◽  
Ion Collisions ◽  
Phobos Collaboration ◽  
Rapidity Distributions ◽  
Pseudorapidity Distributions

By using the revised Landau hydrodynamic model and taking into account the effect of leading particles, we discuss the pseudorapidity distributions of produced charged particles in high energy heavy-ion collisions. The charged particles resulted from the freeze-out of the matter produced in collisions possess the Gaussian-like rapidity distributions. The leading particles are assumed having the rapidity distributions of the Gaussian form with the normalization constant being equal to the number of participants, which can be figured out in theory. It is found that the results from the revised Landau hydrodynamic model together with the contributions from leading particles are well consistent with the experimental data carried out by BNL-RHIC-PHOBOS Collaboration in different centrality Au + Au collisions at energies of [Formula: see text], 130 and 62.4 GeV , respectively.

Experimental Evidence of “In Medio” Effects in Heavy-Ion Collisions at Intermediate Energies

1998 ◽  
pp. 1-11
Author(s):  
A. Badalà ◽  
R. Barbera ◽  
A. Bonasera ◽  
M. Gulino ◽  
A. Palmeri ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Intermediate Energies ◽  
Ion Collisions

AVERAGE PROPERTY OF FRAGMENTATION REACTION AND MOMENTUM DISSIPATION INDUCED BY HALO-NUCLEI IN HEAVY ION COLLISIONS

2006 ◽  
Vol 15 (05) ◽  
pp. 1069-1086
Author(s):  
JIAN-YE LIU ◽  
WEN-JUN GUO ◽  
ZHONG-ZHOU REN ◽  
WEI ZUO ◽  
XI-GUO LEE ◽  
...  
Keyword(s):  
Density Distribution ◽  
Heavy Ion Collisions ◽  
Halo Nucleus ◽  
Heavy Ion ◽  
Halo Nuclei ◽  
Fragmentation Reaction ◽  
Quantum Molecular Dynamics ◽  
Nuclear Stopping ◽  
Density Distributions ◽  
Ion Collisions

We study systematically the average property of fragmentation reaction and momentum dissipation induced by halo-nuclei in intermediate energy heavy ion collisions for different colliding systems and different beam energies within the isospin dependent quantum molecular dynamics model (IQMD). This study is based on the extended halo-nucleus density distributions, which indicates the average property of loosely inner halo nucleus structure, because the interaction potential and in-medium nucleon-nucleon cross section in IQMD model depend on the density distribution. In order to study the average properties of fragmentation reaction and momentum dissipation induced by halo-nuclei we also compare the results for the halo-nuclear colliding systems with those for corresponding stable colliding systems with same mass under the same incident channel condition. We find that the effect of extended halo density distribution on the fragment multiplicity and nuclear stopping (momentum dissipation) are important for the different beam energies and different colliding systems. For example the extended halo density distributions increase the fragment multiplicity but decrease the nuclear stopping for all of incident channel conditions in this paper.

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