SLOW PARTICLE PRODUCTION IN THE INTERACTIONS OF 200 A GeV SULPHUR PROJECTILE WITH NUCLEAR EMULSION

2001 ◽  
Vol 16 (28) ◽  
pp. 1801-1809 ◽  
Author(s):  
S. DHAMIJA ◽  
M. M. AGGARWAL ◽  
V. S. BHATIA
Keyword(s):  
Angular Distribution ◽  
Pion Production ◽  
Nuclear Emulsion ◽  
Particle Production ◽  
Similar Data ◽  
Good Resolution ◽  
Collision Process ◽  
Slow Particle ◽  
Experimental Values ◽  
Grey Particle

We report our experimental results on various constituents of grey particles (0.23< β < 0.7), namely pions, kaons, and baryons, emitted in Sulphur-Emulsion interactions at 200 A GeV energy. These particles have been identified with good resolution and their emission angles have also been measured. Comparison has been made with similar data from proton-Em interactions and with predictions from the Modified FRITIOF Code (MFC). We find that the pion production is higher in the case of S-Em interactions as compared to that in p-Em interactions. MFC gives pions in agreement with our experimental value but underpredicts the kaon yield. The angular distribution is related to the amount of rescattering taking place in the target spectator region. The value of rescattering parameter, κ, as deduced from our data, has been found to be significantly smaller in case of pions as compared to that of kaons and baryons. This indicates that pion production involves a greater degree of rescattering of participants, during the collision process, as compared to kaons and baryons. The values of κ for all the three grey particle constituents, as calculated from the Modified FRITIOF Code, are higher than the experimental values. This suggests that there is a need to incorporate a greater degree of rescattering in the model.

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.

Pion production near threshold on 40Ca: Energy dependence and angular distribution

1976 ◽  
Vol 61 (1) ◽  
pp. 47-49 ◽  
Author(s):  
Y. Le Bornec ◽  
B. Tatischeff ◽  
L. Bimbot ◽  
I. Brissaud ◽  
H.D. Holmgren ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Energy Dependence ◽  
Pion Production ◽  
Near Threshold

Leading particle and nuclear-mass effects on multiparticle production in 50 GeV/c π− interactions in nuclear emulsion

1981 ◽  
Vol 59 (6) ◽  
pp. 812-819 ◽  
Author(s):  
S. C. Varma ◽  
V. Kumar ◽  
A. P. Sharma
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Nuclear Emulsion ◽  
Hadronic Matter ◽  
Multiparticle Production ◽  
Particle Multiplicity ◽  
Nuclear Mass ◽  
Space Time Structure ◽  
Leading Particle ◽  
Grey Particle

An experimental study is carried out on the effects of nuclear mass on leading particle multiplicity and multiparticle production with the help of an emulsion stack exposed to 50 GeV/c π− beam under a strong pulsed magnetic field. The study of the effect of nuclear mass on the forward–backward asymmetry in a π−–A collision is also carried out using the grey particle multiplicity data. The results support the concept of "formation length" of radiation. An attempt is made to explain the space–time structure of hadronic matter in terms of the additive quark model of multiparticle production.

scholarly journals The scattering of electrons in ionizing collisions with gas atoms

1934 ◽  
Vol 144 (853) ◽  
pp. 596-608 ◽  
Keyword(s):  
Angular Distribution ◽  
Energy Distribution ◽  
Cross Sections ◽  
Discrete Level ◽  
Collision Process ◽  
Collision Cross Sections ◽  
Do So

When electrons lose energy by colliding with gas atoms, they may do so either in definite amounts by exciting the atom to a discrete level, or by ionizing the atom, in which case the electrons may lose any amount of their energy over and above the minimum required for ionization. The first process has now been studied in several aspects by a number of investigators ; in particular, the authors have dealt with the angular distribution of the scattered electrons. The study of ionizing collisions, however, has so far been confined largely to the measurements of collision cross-sections, while only slight attention has been paid to the angular distribution and the energy distribution of the scattered electrons. The most valuable information concerning the collision process is to be derived from a detailed study of the angular distribution of the scattered electrons, and such an investigation is described in the present paper.

Sensibility of grey particle production system to energy and centrality in 60A and 200A GeV 16O–Nucleus interactions

2016 ◽  
Vol 25 (06) ◽  
pp. 1650034 ◽  
Author(s):  
A. Abdelsalam ◽  
M. S. El–Nagdy ◽  
B. M. Badawy ◽  
W. Osman ◽  
M. Fayed
Keyword(s):  
Production System ◽  
Particle Production ◽  
Target Size ◽  
Particle Multiplicity ◽  
Distribution Shape ◽  
Wide Range ◽  
Black Particle ◽  
Limiting Fragmentation ◽  
Light Target ◽  
Grey Particle

The grey particle production following 60 A and 200[Formula: see text]A GeV [Formula: see text]O interactions with emulsion nuclei is investigated at different centralities. The evaporated target fragment multiplicity is voted as a centrality parameter. The target size effect is examined over a wide range, where the C, N and O nuclei present the light target group while the Br and Ag nuclei are the heavy group. In the framework of the nuclear limiting fragmentation hypothesis, the grey particle multiplicity characteristics depend only on the target size and centrality while the projectile size and energy are not effective. The grey particle is suggested to be a multisource production system. The emission direction in the 4[Formula: see text] space depends upon the production source. Either the exponential decay or the Poisson’s peaking curves are the usual characteristic shapes of the grey particle multiplicity distributions. The decay shape is suggested to be a characteristic feature of the source singularity while the peaking shape is a multisource super-position. The sensibility to the centrality varies from a source to other. The distribution shape is identified at each centrality region according to the associated source contribution. In general, the multiplicity characteristics seem to be limited w.r.t. the collision system centrality using light target nuclei. The selection of the black particle multiplicity as a centrality parameter is successful through the collision with the heavy target nuclei. In the collision with the light target nuclei it may be qualitatively better to vote another centrality parameter.

scholarly journals Study of Angular Distribution and KNO Scaling in the Collisions of 28Si with Emulsion Nuclei at 14.6A GeV

2021 ◽  
Vol 57 (12) ◽  
pp. 1205
Author(s):  
M. Ayaz Ahmad ◽  
Shafiq Ahmad
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Nuclear Emulsion ◽  
Multiplicity Distribution ◽  
Heavy Ion ◽  
High Energy ◽  
Universal Function ◽  
Heavy Ion Collision ◽  
Present Experimental Data ◽  
Ion Collision

An attempt has been made to study the angular characteristics of heavy ion collision at high energy in the interactions of 28Si nuclei using with nuclear emulsion. The KNO scaling behavior in terms of the multiplicity distribution has been studied. A simplest universal function has been used to represent the present experimental data.

Characteristics of particle production in the interaction of 22.8 GeV/c protons with light nuclei in emulsion

1968 ◽  
Vol 46 (22) ◽  
pp. 2527-2532 ◽  
Author(s):  
B. Bhowmik ◽  
R. K. Shivpuri
Keyword(s):  
Angular Distribution ◽  
Transverse Momentum ◽  
Particle Production ◽  
Center Of Mass ◽  
Light Nuclei ◽  
High Multiplicity ◽  
Secondary Particles ◽  
Nucleon Interactions

The present work is aimed at the study of the characteristics of particle production in interactions between proton and light nuclei. The features studied are angular distribution, inelasticity, transverse momentum, and center-of-mass momentum of the secondary particles. In order to determine the contribution of multinucleon collisions, the results have been compared with those of proton–nucleon interactions. It has been found that, whereas the features of low-multiplicity events closely resemble the similar events from p–N collisions, those of high-multiplicity events are somewhat modified by the occurrence of intranuclear interactions.

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