Possible mechanisms for production of slow target fragments

2018 ◽  
Vol 27 (10) ◽  
pp. 1850086
Author(s):  
A. Abdelsalam ◽  
M. S. El–Nagdy ◽  
A. M. Abdalla ◽  
A. Saber
Keyword(s):  
Low Temperature ◽  
Energy Range ◽  
Target Nucleus ◽  
Mass Number ◽  
Particle Production ◽  
Target Size ◽  
Projectile Energy ◽  
Angular Distributions ◽  
Energy Formula ◽  
Emission System

In this paper, we investigate the possible mechanisms, which are responsible for the production of slow target fragments with energy [Formula: see text][Formula: see text]MeV that are emitted from interactions of [Formula: see text]Si nucleus with emulsion nuclei at energy 14.6[Formula: see text]GeV per nucleon. Angular distributions of slow fragments are compared with the corresponding results from collisions of 1H, 3He, 4He, 7Li and [Formula: see text]C with emulsion at the energy range 2.2–3.7[Formula: see text]A[Formula: see text]GeV. We investigate the effects of both projectile energy and mass number on the angular distributions for slow secondary charged fragments called gray and black track producing particles. The average emission angles are found to be [Formula: see text] and [Formula: see text] for gray and black tracks, respectively. These values are nearly constant for all compared experiments. There are two different mechanisms of gray particle production in forward and backward directions while there is a single symmetric mechanism for black particles in both directions. The temperatures are found to be 58 and 6[Formula: see text]MeV for systems of emissions for gray and black particles, respectively. There are strong effects of target size on those mechanisms. The emission system of these particles becomes slower and shows low temperature with the increase in volume of target nucleus.

scholarly journals Particle production at RHIC and LHC energies

2015 ◽  
Vol 30 (22) ◽  
pp. 1550131 ◽  
Author(s):  
A. Tawfik ◽  
E. Gamal ◽  
A. G. Shalaby
Keyword(s):  
Particle Production ◽  
Hadron Collider ◽  
Center Of Mass ◽  
System Size ◽  
Alice Experiment ◽  
Center Of Mass Energy ◽  
Particle Ratios ◽  
Strangeness Enhancement ◽  
Homogeneous Particle ◽  
Energy Formula

The production of pion, kaon and proton was measured in Pb–Pb collisions at nucleus–nucleus center-of-mass energy [Formula: see text] by the ALICE experiment at Large Hadron Collider (LHC). The particle ratios of these species compared to the RHIC measurements are confronted to the hadron resonance gas (HRG) model and to simulations based on the event generators PYTHIA 6.4.21 and HIJING 1.36. It is found that the homogeneous particle–antiparticle ratios (same species) are fully reproducible by means of HRG and partly by PYTHIA 6.4.21 and HIJING 1.36. The mixed kaon–pion and proton–pion ratios measured at RHIC and LHC energies seem to be reproducible by the HRG model. On the other hand, the strange abundances are underestimated in both event generators. This might be originated to strangeness suppression in the event generators and/or possible strangeness enhancement in the experimental data. It is apparent that the values of kaon–pion ratios are not sensitive to the huge increase of [Formula: see text] from 200 (RHIC) to 2760 GeV (LHC). We conclude that the ratios of produced particle at LHC seem not depending on the system size.

scholarly journals Angular distributions and anisotropy of fission fragments from neutron-induced fission in intermediate energy range 1–200 MeV

2017 ◽  
Vol 146 ◽  
pp. 04011 ◽  
Author(s):  
Alexander S. Vorobyev ◽  
Alexei M. Gagarski ◽  
Oleg A. Shcherbakov ◽  
Larisa A. Vaishnene ◽  
Alexei L. Barabanov
Keyword(s):  
Energy Range ◽  
Intermediate Energy ◽  
Angular Distributions ◽  
Fission Fragments ◽  
Induced Fission

scholarly journals Experimental study of the 2n-transfer reaction 138Ba(18O,16O)140Ba in the projectile energy range 61–67 MeV

2020 ◽  
Vol 128 (6) ◽  
pp. 62001
Author(s):  
A. Khaliel ◽  
T. J. Mertzimekis ◽  
F. C. L. Crespi ◽  
G. Zagoraios ◽  
D. Papaioannou ◽  
...  
Keyword(s):  
Experimental Study ◽  
Energy Range ◽  
Transfer Reaction ◽  
Projectile Energy

Angular Distributions and Anisotropy of Fragments from the Neutron-Induced Fission of 237Np in the Energy Range of 1–200 MeV: Measurement Data and Model Calculations

JETP Letters ◽  
2019 ◽  
Vol 110 (4) ◽  
pp. 242-249 ◽  
Author(s):  
A. S. Vorobyev ◽  
A. M. Gagarski ◽  
O. A. Shcherbakov ◽  
L. A. Vaishnene ◽  
A. L. Barabanov
Keyword(s):  
Energy Range ◽  
Measurement Data ◽  
Angular Distributions ◽  
Model Calculations ◽  
Induced Fission

scholarly journals On the origin of the TeV gamma-ray emission from Cygnus X-3

2019 ◽  
Vol 208 ◽  
pp. 14008
Author(s):  
V.G. Sinitsyna ◽  
V.Y. Sinitsyna
Keyword(s):  
Energy Range ◽  
Particle Production ◽  
Cosmic Ray ◽  
High Energy ◽  
Wide Energy Range ◽  
Electromagnetic Spectrum ◽  
Essential Information ◽  
Wide Range ◽  
Γ Ray ◽  
Very High

Cygnus X-3 binary system is a famous object studied over the wide range of electromagnetic spectrum. Early detections of ultra-high energy gamma-rays from Cygnus X-3 by Kiel, Havera Park and then by Akeno triggered the construction of several large air shower detectors. Also, Cygnus X-3 has been proposed to be one of the most powerful sources of charged cosmic ray particles in the Galaxy. The results of twenty-year observations of the Cyg X-3 binary at energies 800 GeV - 85 TeV are presented with images, spectra during periods of flaring activity and at low flux periods. The correlation of TeV flux increases with flaring activity at the lower energy range of X-ray and radio emission from the relativistic jets of Cygnus X-3 is found as well as 4.8-hour orbital modulation of TeV γ-ray intensity. Detected modulation of TeV γ-ray emission with orbit and important characteristics of Cyg X-3 such as the high luminosity of the companion star and the close orbit leads to an efficient generation of γ-ray emission through inverse Compton scattering in this object. The different type variability of very high-energy γ-emission and correlation of radiation activity in the wide energy range can provide essential information on the mechanism of particle production up to very high energies.

scholarly journals Angular distributions of the alpha particle production in the7Li+144Sm system at near-barrier energies

2015 ◽  
Vol 630 ◽  
pp. 012023
Author(s):  
P F F Carnelli ◽  
A Arazi ◽  
O A Capurro ◽  
J O Fernández Niello ◽  
D Martinez Heimann ◽  
...  
Keyword(s):  
Alpha Particle ◽  
Particle Production ◽  
Angular Distributions

PARTICLE PRODUCTION IN π−-NUCLEUS COLLISIONS AT 340 GeV/c

1991 ◽  
Vol 06 (06) ◽  
pp. 929-934
Author(s):  
A. TUFAIL ◽  
S. AHMAD ◽  
A.R. KHAN ◽  
M. ZAFAR ◽  
M. SHAFI
Keyword(s):  
Particle Production ◽  
Rapidity Distribution ◽  
Angular Distributions ◽  
Width Distribution

A study of the angular distributions of charged shower particles produced in 340 GeV π−-nucleus interactions is presented. The variations of mean pseudorapidity and dispersion of the rapidity distribution with various multiplicities have been studied in detail. Rapidity-width distribution has also been investigated.

Pionization at AGS and SPS energies ― degree of coherence and its target excitation dependence

2009 ◽  
Vol 87 (4) ◽  
pp. 311-319 ◽  
Author(s):  
Dipak Ghosh ◽  
Argha Deb ◽  
Srimonti Dutta
Keyword(s):  
Particle Production ◽  
Source Model ◽  
Higher Order ◽  
Point Of View ◽  
Projectile Energy ◽  
Data Set ◽  
Energy Scaling ◽  
Degree Of Coherence

The target excitation dependence of the higher order cumulant correlation of pions is studied in the present work in the framework of void probability scaling. The data set of pions produced for 16O–AgBr interactions at 2.1 AGeV and 32S–AgBr interactions at 200 AGeV was divided into three sets depending upon the number of grey tracks ng. The different sets of ng correspond to different degrees of target excitation. Analysis was carried out for each set in different pseudorapidity intervals. For the lower projectile energy the void probability scaling is observed only for low target excitation for all pseudorapidity intervals. For the comparatively higher projectile energy, scaling is observed for all pseudorapidity intervals and all target excitation. In other words, for higher projectile energy, scaling is almost independent of the target excitation. The results are interpreted from the point of view of the two source model of particle production.

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