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 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.

scholarly journals Studying Strangeness Production with HADES

2018 ◽  
Vol 171 ◽  
pp. 01001
Author(s):  
Heidi Schuldes
Keyword(s):  
Mass Spectra ◽  
Threshold Energy ◽  
Heavy Ion ◽  
Spectral Shape ◽  
Transverse Mass ◽  
Fixed Target ◽  
Fixed Target Experiments ◽  
Ion Collisions ◽  
Global Properties ◽  
The World

The High-Acceptance DiElectron Spectrometer (HADES) operates in the 1 - 2A GeV energy regime in fixed target experiments to explore baryon-rich strongly interacting matter in heavy-ion collisions at moderate temperatures with rare and penetrating probes. We present results on the production of strange hadrons below their respective NN threshold energy in Au+Au collisions at 1.23A GeV ([see formula in PDF] = 2.4 GeV). Special emphasis is put on the enhanced feed-down contribution of ϕ mesons to the inclusive yield of K- and its implication on the measured spectral shape of K-. Furthermore, we investigate global properties of the system, confronting the measured hadron yields and transverse mass spectra with a Statistical Hadronization Model (SHM) and a blastwave parameterization, respectively. These supplement the world data of the chemical and kinetic freeze-out temperatures.

scholarly journals Re-hardening of hadron transverse mass spectra in relativistic heavy-ion collisions

Pramana ◽  
2006 ◽  
Vol 66 (5) ◽  
pp. 809-816
Author(s):  
P. K. Sahu ◽  
N. Otuka ◽  
M. Isse ◽  
Y. Nara ◽  
A. Ohnishi
Keyword(s):  
Heavy Ion Collisions ◽  
Mass Spectra ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Transverse Mass ◽  
Ion Collisions

NON-EQUILIBRIUM APPROACH TO DENSE HADRONIC MATTER

1995 ◽  
Vol 04 (01) ◽  
pp. 1-45 ◽  
Author(s):  
D.N. VOSKRESENSKY ◽  
D. BLASCHKE ◽  
G. RÖPKE ◽  
H. SCHULZ
Keyword(s):  
Heavy Ion Collisions ◽  
Particle System ◽  
Heavy Ion ◽  
Hadronic Matter ◽  
Diagram Technique ◽  
Medium Effects ◽  
Ion Collisions ◽  
Equilibrium Approach ◽  
Kinetics Of ◽  
Non Equilibrium

A general approach to the kinetics of a hadronic many-particle system is formulated employing a nonequilibrium diagram technique. The investigation of medium effects is based on the analysis of the coupled set of nonequilibrium Dyson equations for the π, N, and Δ components. Some model approaches to their solution are considered. The results are applied to the study of expanding hadronic fireballs containing pions, nucleons, and deltas as produced in the course of heavy-ion collisions at energies provided by the GSI-SIS up to the CERN-SpS.

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.

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