Studies of Asymmetric particle Production in Different Multiplicity Zone in Azimuthal Space in High Energy Nucleus-Nucleus Interactions

2020 ◽  
Author(s):  
Swarnapratim Bhattacharyya
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Particle Production ◽  
High Energy ◽  
Experimental Results ◽  
Dynamical Fluctuations ◽  
Experimental Findings

Studies of asymmetric particle production and investigation of dynamical fluctuations in different multiplicity zone in azimuthal space are performed for <sup>16</sup>O-AgBr, <sup>22</sup>Ne-AgBr, <sup>28</sup>Si-AgBr and <sup>32</sup>S-AgBr interactions at (4.1-4.5) AGeV/c. Evidence of strong dynamical fluctuations is observed for the experimental data. Comparisons of the experimental results with the results of Monte Carlo simulated events (MC-RAND) and the results obtained from the analysis of AMPT model also strengthen the experimental findings.

Systematic study of rapidity dispersion parameter in high energy nucleus–nucleus interactions

2014 ◽  
Vol 23 (03) ◽  
pp. 1450012 ◽  
Author(s):  
Swarnapratim Bhattacharyya ◽  
Maria Haiduc ◽  
Alina Tania Neagu ◽  
Elena Firu
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Systematic Study ◽  
Nuclear Emulsion ◽  
Quantitative Measure ◽  
High Energy ◽  
Average Multiplicity ◽  
Experimental Results ◽  
Dispersion Parameter ◽  
Parameter Values

A systematic study of rapidity dispersion parameter as a quantitative measure of clustering of particles has been carried out in the interactions of 16 O , 28 Si and 32 S projectiles at 4.5 A GeV/c with heavy ( AgBr ) and light (CNO) groups of targets present in the nuclear emulsion. For all the interactions, the total ensemble of events has been divided into four overlapping multiplicity classes depending on the number of shower particles. For all the interactions and for each multiplicity class, the rapidity dispersion parameter values indicate the occurrence of clusterization during the multiparticle production at Dubna energy. The measured rapidity dispersion parameter values are found to decrease with the increase of average multiplicity for all the interactions. The dependence of rapidity dispersion parameter on the average multiplicity can be successfully described by a relation D(η) = a + b〈ns〉 + c〈ns〉2. The experimental results have been compared with the results obtained from the analysis of Monte Carlo simulated (MC-RAND) events. MC-RAND events show weaker clusterization among the pions in comparison to the experimental data.

ANGULAR DISTRIBUTIONS OF TARGET BLACK FRAGMENTS IN NUCLEUS–NUCLEUS COLLISIONS AT HIGH ENERGY

2003 ◽  
Vol 12 (05) ◽  
pp. 713-723 ◽  
Author(s):  
FU-HU LIU ◽  
NABIL N. ABD ALLAH ◽  
DONG-HAI ZHANG ◽  
MAI-YING DUAN
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
High Energy ◽  
Ideal Gas ◽  
Experimental Results ◽  
Angular Distributions ◽  
Ideal Gas Model

The experimental results of space, azimuthal, and projected angular distributions of target black fragments produced in silicon-emulsion collisions at 4.5A GeV/c (the Dubna energy) are reported. A multi-source ideal gas model is suggested to describe the experimental angular distributions. The Monte Carlo calculated results are in agreement with the experimental data.

scholarly journals High energy cosmic ray interactions and UHECR composition problem

2019 ◽  
Vol 210 ◽  
pp. 02001
Author(s):  
Sergey Ostapchenko
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Hadronic Interactions ◽  
High Energy Cosmic Rays ◽  
Cosmic Ray Interactions ◽  
Composition Problem

The differences between contemporary Monte Carlo generators of high energy hadronic interactions are discussed and their impact on the interpretation of experimental data on ultra-high energy cosmic rays (UHECRs) is studied. Key directions for further model improvements are outlined. The prospect for a coherent interpretation of the data in terms of the UHECR composition is investigated.

scholarly journals USE OF THE MONTE CARLO SERPENT CODE FOR MODELING THE SECOND SERIES OF EXPERIMENTAL DATA OF KUCA SUBCRITICAL INSTALLATION

2019 ◽  
pp. 88-93
Author(s):  
O.R. Trofymenko ◽  
А.V. Nosovsky ◽  
V.I. Gulik
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Physical Characteristics ◽  
Experimental Results ◽  
Calculation Results ◽  
Effective Multiplication

Modeling of the neutron-physical characteristics of the Kyoto University KUCA subcritical facility was conducted using the Monte Carlo Serpent code. The effective multiplication factors for the critical experiments of the series II on the KUCA research subcritical facility were calculated. The presented calculation results were compared with the experimental results and the results of the calculations made using the Monte Carlo codes MCNP6 and KENO-VI.

scholarly journals Laboratory radiative accretion shocks on GEKKO XII laser facility for POLAR project

2018 ◽  
Vol 6 ◽  
Author(s):  
L. Van Box Som ◽  
É. Falize ◽  
M. Koenig ◽  
Y. Sakawa ◽  
B. Albertazzi ◽  
...  
Keyword(s):  
Experimental Data ◽  
Laser Energy ◽  
High Energy ◽  
Experimental Results ◽  
Material Structure ◽  
Reverse Shock ◽  
Before And After ◽  
Laser Facility ◽  
Post Shock ◽  
Accretion Shocks

A new target design is presented to model high-energy radiative accretion shocks in polars. In this paper, we present the experimental results obtained on the GEKKO XII laser facility for the POLAR project. The experimental results are compared with 2D FCI2 simulations to characterize the dynamics and the structure of plasma flow before and after the collision. The good agreement between simulations and experimental data confirms the formation of a reverse shock where cooling losses start modifying the post-shock region. With the multi-material structure of the target, a hydrodynamic collimation is exhibited and a radiative structure coupled with the reverse shock is highlighted in both experimental data and simulations. The flexibility of the laser energy produced on GEKKO XII allowed us to produce high-velocity flows and study new and interesting radiation hydrodynamic regimes between those obtained on the LULI2000 and Orion laser facilities.

Target productions in forward and backward hemispheres in the interactions of 28Si-EM at 14.6A GeV

2015 ◽  
Vol 24 (11) ◽  
pp. 1550084 ◽  
Author(s):  
A. Abdelsalam ◽  
M. S. El-Nagdy ◽  
A. M. Abdalla ◽  
A. Saber
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Energy Dependence ◽  
Mass Number ◽  
Particle Production ◽  
Charged Particles ◽  
Experimental Results ◽  
Anisotropy Ratio ◽  
Nuclear Emulsions ◽  
Slow Particle

This paper search for the results and properties of slow particle productions, appear as a gray and black tracks in nuclear emulsions, producing secondary charged particles which are emitted from [Formula: see text]Si interactions with emulsion nuclei at 14.6[Formula: see text] GeV. The forward particles emission of interactions, ([Formula: see text]) as well as the backward ones ([Formula: see text]), have been investigated. It includes the effect of both projectile mass number and energy on the production and multiplicities of these particles. The results compared with other experiments for the same target but with different projectiles and energies. The experimental data show that there are two different mechanisms responsible for the production of gray particles for the chosen channels of emission angles and each are energy dependence. This dependence is weakly on the projectile mass number. The same investigations are applied for black tracks producing particles. The experimental results show the production of these particles is purely target fragments independent on both projectile mass number and its energy. The anisotropy ratio of angular distribution (F/B) is applied for both kinds of particles which are found the value for gray particle production depends on the direction of emissions while it is unchanged for black particles.

scholarly journals Comparative analysis of strange meson production in heavy ion collisions

2021 ◽  
Vol 2103 (1) ◽  
pp. 012134
Author(s):  
V S Borisov ◽  
A Ya Berdnikov ◽  
Ya A Berdnikov ◽  
D O Kotov ◽  
Iu M Mitrankov
Keyword(s):  
Experimental Data ◽  
Heavy Ion Collisions ◽  
Particle Production ◽  
High Energy Physics ◽  
Heavy Ion ◽  
High Energy ◽  
Jet Quenching ◽  
Model Calculations ◽  
Quenching Effect ◽  
Ion Collisions

Abstract The study of deconfinement state of nuclear matter called quark-gluon plasma (QGP) and phase transition of QGP to hadronic gas is the main goal of high energy physics. Some of the important signatures of QGP formation in heavy-ion collisions include strangeness enhancement at intermediate values of the transverse momentum (ρT ) and a jet quenching effect at high ρT values. Nuclear modification factors (RAB ) for light hadrons are used to quantify these effects. The K *0 and φ mesons can serve as a good probes to investigate QGP properties, because these mesons contain (anti)strange quark and its yields can be measured in a wide ρT range. Comparison of experimental data with theoretical model calculations is important for understanding the evolution of heavy-ion collision. One of the most commonly used event generators to describe experimental results of collider experiments is Pythia8. This paper shows, that Pythia8 predicts RAB values of K *0 and φ less than RAB values in experimental data. Consequently, additional (hidden)strange particle production mechanisms are involved.

scholarly journals Shower and Slow Particle Productions in Nucleus-Nucleus Collisions at High Energy

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
S. Fakhraddin ◽  
Magda A. Rahim ◽  
Hamdy M. M. Zayd
Keyword(s):  
Experimental Data ◽  
Thermal Model ◽  
Theoretical Calculations ◽  
High Energy ◽  
Experimental Results ◽  
Angular Distributions ◽  
Target Groups ◽  
Slow Particle ◽  
Multiplicity Distributions

The multiplicity distributions of shower, grey, and black particles produced in interactions of4He,12C,16O,22Ne, and28Si with emulsion (Em) at 4.1–4.5 A GeV/c beam energies, and their dependence on target groups (H, CNO, and AgBr) is presented and has been reproduced by multisource thermal model. The multiplicity and the angular distributions of the three types of particles have been investigated. The experimental results are compared with the corresponding ones from the model. We found that the experimental data agrees with theoretical calculations using multisource thermal model.

To be or not to be in the sample? On using manipulation checks in experimental accounting research

2020 ◽  
Vol 33 (3) ◽  
pp. 469-482
Author(s):  
Peter Kotzian ◽  
Thomas Stoeber ◽  
Florian Hoos ◽  
Barbara E. Weissenberger
Keyword(s):  
Experimental Data ◽  
Statistical Analysis ◽  
Design Methodology ◽  
Experimental Results ◽  
Manipulation Check ◽  
Full Sample ◽  
Content Type ◽  
Accounting Research ◽  
Experimental Findings ◽  
Statistical Results

Purpose Manipulation checks are a recommended for experimental accounting research. Usage of information gained by manipulation checks varies. In some studies, participants who failed the manipulation check are removed from the sample. Other studies report the results of the manipulation checks but still use the full sample. Some authors recommend removing participants who failed the manipulation check as a means to increase the power of the statistical analysis. Others warn that removing these participants endangers the randomization as a crucial precondition for gaining valid insights from experimental research. Until now, there is little research on how sensitive results react to exclusion of participants. The purpose of this paper is to study the effects of removing participants failing the manipulation checks on the evaluation of a hypothesis and the development of alternative usages of the information gained from manipulation checks. Design/methodology/approach Based on an analytical model and a simulation, the authors show how removing participants who fail the manipulation check affects experimental findings. Findings Simulations show that statistical results and conclusions drawn from an experiment differ substantially, depending on whether participants who failed the manipulation check are removed from the sample. As the participants who are removed are no random sub-sample, but share a certain property, the experimental results react strongly, typically showing significant results, where there are actually none. Originality/value This paper is, to the best of the authors’ knowledge, the first to address the sensitivity of experimental results to removing participants who fail the manipulation check from the sample and the implications for the validity of conclusions drawn from experimental accounting research. This paper’s contribution is a better way of using information gained in the manipulation check in the statistical analysis of the experimental data.

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