Factorial moments in high-multiplicity events in 800 GeV proton interactions with AgBr nuclei

1993 ◽  
Vol 71 (7-8) ◽  
pp. 316-321
Author(s):  
R. K. Shivpuri ◽  
V. K. Verma
Keyword(s):  
Phase Transitions ◽  
Power Law ◽  
Nuclear Emulsion ◽  
High Multiplicity ◽  
Factorial Moments ◽  
Secondary Particles ◽  
The Third ◽  
The Moment ◽  
Scaled Factorial Moments

The scaled factorial moments were investigated for secondary particles in high-multiplicity events produced by 800 GeV proton interactions with AgBr nuclei in a nuclear emulsion. The results show clear evidence for power-law behavior of scaled factorial moments. The variation of dimension as a function of order of the moment was also studied. The presence of phase transitions is not indicated from our data. From the behavior of the third-differential moment, we do not find any evidence for the clustering of particles in any pseudorapidity region.

EVIDENCE FOR INTERMITTENCY IN HADRON–NUCLEUS AND NUCLEUS–NUCLEUS COLLISIONS AT RELATIVISTIC ENERGIES

1999 ◽  
Vol 14 (22) ◽  
pp. 3451-3465 ◽  
Author(s):  
R. HASAN ◽  
M. ZAFAR ◽  
M. S. AHMAD ◽  
A. TUFAIL
Keyword(s):  
Power Law ◽  
Scaling Law ◽  
Higher Order ◽  
Factorial Moments ◽  
Secondary Particles ◽  
Multiplicity Distributions ◽  
Scaled Factorial Moments

Scaled factorial moments are calculated for multiplicity distributions in the pseudorapidity intervals of secondary particles produced in p-Em collisions at 400 GeV, π-- Em collisions at 340 GeV and 12 C-Em collisions at 3.6 A GeV. In the p-Em and 12 C-Em collisions an intermittent power law growth of the factorial moments clearly observed, but no such dependence is found in π-- Em collisions. Higher order scaled factorial moments are found to obey a scaling law.

NUCLEAR MULTIFRAGMENTATION AND INTERMITTENCY

1992 ◽  
Vol 07 (13) ◽  
pp. 1113-1121 ◽  
Author(s):  
G. SINGH ◽  
P. L. JAIN ◽  
M. S. EL-NAGDY
Keyword(s):  
Charge Distribution ◽  
Power Law ◽  
Nuclear Emulsion ◽  
Critical Phenomenon ◽  
Convincing Evidence ◽  
Nuclear Fragmentation ◽  
Factorial Moments ◽  
Intermittent Behavior ◽  
Scaled Factorial Moments ◽  
Nuclear Multifragmentation

The charge distribution of nuclear fragments for events of 131 Xe at 1.22A GeV in nuclear emulsion is fitted with a power law. Method of scaled factorial moments is used to study fluctuations in the nuclear fragmentations. An intermittent behavior is found in the data but no convincing evidence of critical phenomenon is observed in nuclear fragmentation.

scholarly journals Correlations and Event-by-Event Fluctuations in High Multiplicity Events Produced in 208Pb-208Pb Collisions

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Shakeel Ahmad ◽  
Shaista Khan ◽  
Ashwini Kumar ◽  
Arpit Singh ◽  
A. Ahmad ◽  
...  
Keyword(s):  
Azimuthal Angle ◽  
Correlation Study ◽  
High Multiplicity ◽  
Dimensional Structure ◽  
Two Dimensional ◽  
Factorial Moments ◽  
High Magnitude ◽  
Large Fluctuations ◽  
Dynamical Fluctuations ◽  
Scaled Factorial Moments

Analysis of high multiplicity events produced in 158A GeV/c 208Pb-208Pb collisions is carried out to study the event-by-event fluctuations. The findings reveal that the method of scaled factorial moments can be used to identify the events having densely populated narrow phase space bins. A few events sorted out by adopting this approach are individually analyzed. It is observed that these events do exhibit large fluctuations in their pseudorapidity, η, and azimuthal angle, ϕ, distributions arising due to some dynamical reasons. Two-particle Δη-Δϕ correlation study applied to these events too indicates that some complex two-dimensional structure of significantly high magnitude is present in these events which might have some dynamical origin. The findings reveal that the method of scaled factorial moments may be used as an effective triggering for events with large dynamical fluctuations.

INTERMITTENCY ANALYSIS OF FRAGMENTING NUCLEI WITH EXACT CONSERVATION LAWS

1993 ◽  
Vol 08 (07) ◽  
pp. 1283-1294
Author(s):  
K. HAGLIN ◽  
C. GALE ◽  
S. DAS GUPTA
Keyword(s):  
Monte Carlo ◽  
Conservation Laws ◽  
Thermodynamic Model ◽  
Nuclear Emulsion ◽  
Size Dependence ◽  
Conserved Quantities ◽  
Factorial Moments ◽  
Evaporation Model ◽  
Scaled Factorial Moments ◽  
Intermittency Analysis

We show that the speculative charge bin size dependence of the scaled factorial moments for fragmenting nuclei in recent nuclear emulsion data may be attributed in part to simple conservation laws. Monte Carlo results from both the Thermodynamic Model and an Evaporation Model suggest that in such studies most or all of the effect is due to the fact that there exist constraints owing to conserved quantities.

INTERMITTENCY IN 4.5A AND 14.5A GeV/c28Si-NUCLEUS INTERACTIONS

2002 ◽  
Vol 11 (02) ◽  
pp. 131-141 ◽  
Author(s):  
W. BARI ◽  
N. AHMAD ◽  
M. M. KHAN ◽  
SHAKEEL AHMAD ◽  
M. ZAFAR ◽  
...  
Keyword(s):  
Factorial Moment ◽  
Fractal Dimensions ◽  
Fractal Nature ◽  
Factorial Moments ◽  
Linear Behavior ◽  
Rapidity Interval ◽  
Thermal Phase Transition ◽  
Thermal Phase ◽  
The Moment ◽  
Scaled Factorial Moments

The occurrence of intermittent patterns in 14.5 A GeV/c 28 Si -nucleus interactions is examined in terms of Scaled Factorial Moments (SFMs), introduced by Bialas and Peschanski. Further, to examine the dependence of various interesting characteristics of SFMs on incident energy, the data on 4.5 A GeV/c 28 Si -nucleus collisions available in our laboratory are analyzed. Interestingly, log-log plots between rapidity interval δη and the qth order factorial moment Fq for both the energies exhibit linear behavior indicating thereby the presence of intermittency in the interactions investigated. Moreover, to look at the fractal nature of the particle emitting sources, variation of the fractal dimensions, dq with the order of the moment is investigated. Finally, study of the variation of λq [=(ϕq+1)/q)] with the order of the moment, q indicates a possibility of non-thermal phase transition in certain types of events

INVESTIGATION OF INTERMITTENCY IN 28Si-NUCLEUS COLLISIONS AT 14.5A GeV

1992 ◽  
Vol 07 (02) ◽  
pp. 93-101 ◽  
Author(s):  
P.L. JAIN ◽  
G. SINGH
Keyword(s):  
Power Law ◽  
Higher Dimensions ◽  
Heavy Ion ◽  
The Other ◽  
Two Dimensional ◽  
Factorial Moments ◽  
Central Collisions ◽  
28Si Nucleus ◽  
Multiplicity Distributions ◽  
Scaled Factorial Moments

Scaled factorial moments are computed for the multiplicity distributions of the 28 Si -emulsion interactions at 14.5A GeV in one- and two-dimensional phase spaces. An intermittency power-law is observed for the central collisions. The observations are found to be different in higher dimensions and they are compared with the other heavy-ion projectiles.

scholarly journals New baryonic and mesonic observables from NA61/SHINE

2018 ◽  
Vol 182 ◽  
pp. 02082 ◽  
Author(s):  
Antoni Marcinek
Keyword(s):  
Power Law ◽  
Meson Production ◽  
System Size ◽  
Density Fluctuations ◽  
Proton Density ◽  
Factorial Moments ◽  
Strongly Interacting ◽  
Charged Meson ◽  
The Spectator ◽  
Scaled Factorial Moments

One of the main objectives of the NA61/SHINE experiment at the CERN SPS is to study properties of strongly interacting matter. This paper presents new results on observables relevant for this part of the NA61/SHINE programme. These include the first ever measurements of ϕ meson production in p+p collisions at 40 and 80 GeV, and most detailed ever experimental data at 158 GeV. This contribution demonstrates the superior accuracy of the present dataset with respect to existing measurements. The comparison of p+p to Pb+Pb collisions shows a non-trivial system size dependence of the longitudinal evolution of hidden strangeness production, contrasting with that of other mesons. Furthermore, proton density fluctuations are investigated as a possible order parameter of the second order phase transition in the neighbourhood of the critical point (CP) of strongly interacting matter. An intermittency analysis is performed of the proton second scaled factorial moments in transverse momentum space. A previous analysis of this sort revealed significant power-law fluctuations for the “Si”+Si system at 158A GeV measured by the NA49 experiment. The fitted power-law exponent was consistent within errors with the theoretically expected critical value, a result suggesting a baryochemical potential in the vicinity of the CP of about 250MeV [24]. The analysis will now be extended to NA61/SHINE systems of similar size, Be+Be and Ar+Sc, at 150A GeV. Finally, spectator-induced electromagnetic (EM) effects on charged meson production are being studied and bring information on the space-time position of the pion formation zone, which appears to be much closer to the spectator system for faster pions than for slower ones. On that basis, we demonstrate that the longitudinal evolution of the system at CERN SPS energies may be interpreted as a pure consequence of local energymomentum conservation.

INTERMITTENCY PATTERNS IN PROTON-NUCLEUS INTERACTIONS AT HIGH ENERGY

1993 ◽  
Vol 08 (40) ◽  
pp. 3853-3859 ◽  
Author(s):  
D. K. MAITY ◽  
P. K. BANERJEE ◽  
B. B. DAS ◽  
D. RAVINDRAN ◽  
D. K. BHATTACHARJEE
Keyword(s):  
Power Law ◽  
Quark Gluon Plasma ◽  
Center Of Mass ◽  
Gluon Plasma ◽  
High Energy ◽  
Mass Energy ◽  
Factorial Moments ◽  
Center Of Mass Energy

A study of intermittency in hadron-nucleus and the comparison with nucleus-nucleus interactions is presented. The power law behavior of the factorial moments and the variation of intermittency index with the center-of-mass energy are shown. Results favor the formation of quark-gluon plasma in preference to a cascade mechanism.

SYSTEMATIC COMPARISON OF THE EXPERIMENTAL DATA WITH THE FRITIOF MODEL IN NUCLEUS–NUCLEUS INTERACTIONS WITH LIGHT AND HEAVY TARGET NUCLEI IN NUCLEAR EMULSION AT 4.5A Gev/c

2002 ◽  
Vol 11 (02) ◽  
pp. 161-175 ◽  
Author(s):  
M. MOHERY ◽  
N. N. ABD-ALLAH
Keyword(s):  
Experimental Data ◽  
Nuclear Emulsion ◽  
Multiplicity Distribution ◽  
Angular Distributions ◽  
Target Groups ◽  
Systematic Comparison ◽  
Secondary Particles ◽  
Heavy Target ◽  
Light Target ◽  
Fritiof Model

The characteristics of the interactions of 4.5 A GeV/c 28 Si nuclei with emulsion have been investigated. The method of separating interactions into those with hydrogen, light and heavy target nuclei has been discussed. The multiplicity distribution, average multiplicities, multiplicity correlation and the angular distributions of the secondary particles emitted in 28 Si -emulsion are calculated according to the Modified Fritiof Model and compared with the experimental data and with other available data for p, 12 C , 24 Mg at the same energy. It has been found that the modified Fritiof model can describe the multiplicity characteristics of the different emitted particles in the above-mentioned interaction with different target groups. The comparison of the experimental data with the modified Fritiof model shows no clear preference for the case of the light target while it seems to be nearer to the experimental data in the case of the heavy target and the emulsion

scholarly journals The Steady Profile of an Axisymmetric Ice Sheet

1981 ◽  
Vol 27 (95) ◽  
pp. 25-37 ◽  
Author(s):  
I. R. Johnson
Keyword(s):  
Aspect Ratio ◽  
Power Law ◽  
Viscous Incompressible Fluid ◽  
Ice Sheet ◽  
Plane Flow ◽  
The Third ◽  
Basal Sliding ◽  
Steady Plane ◽  
Third Dimension ◽  
Special Case

AbstractSteady plane flow under gravity of an axisymmetric ice sheet resting on a horizontal rigid bed, subject to surface accumulation and ablation, basal drainage, and basal sliding is treated according to a power law between shear traction and velocity. The surface accumulation is taken to depend on height, and the drainage and sliding coefficient also depend on the height of overlying ice. The ice is described as a general non-linearly viscous incompressible fluid, and temperature variation through the ice sheet is neglected. Illustrations are presented for Glen’s power law (including the special case of a Newtonian fluid), and the polynomial law of Colbeck and Evans. The analysis follows that of Morland and Johnson (1980) where the analogous problem for an ice sheet deforming under plane flow was considered. Comparisons are made between the two models and it is found that the effect of the third dimension is to reduce (or leave unchanged) the aspect ratio for the cases considered, although no general formula can be obtained. This reduction is seen to depend on both the surface accumulation and the sliding law.

Sign in / Sign up

Export Citation Format

Share Document