Angular Distributions of Target Black Fragments in Nucleus–nucleus Collisions at High Energy

Abstract

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.

Pseudorapidity distributions of charged particles inp−p̄orp−pcollisions at high energies and predictions at ultrahigh energies

“…In fact, the NSD and INEL collisions have a constant normalization of the cross section [9,12]. Following our recent investigation [13] and analysis of the experimental data with the multisource ideal gas model [14][15][16][17], we find the deviation between the two normalizations being less than 6%.…”

“…The participant-spectator picture is a base of nucleonnucleon and nucleus-nucleus collision theories and many other theoretical models, such as the LEXUS model [21], the nuclear fireball model [22,23], the QMD model [24][25][26][27], the Glauber model [28], the two-component model [29,30], the threshold model [31,32], the HSD model [33][34][35], the nuclear overlap model [36], the multisource ideal gas model [14][15][16][17], and so on. In the frameworks of multisource ideal gas model and nuclear geometry theory, each nucleus goes straight in collisions.…”

“…According to our recent investigation [13] finished in the framework of the multisource ideal gas model [14][15][16][17], the experimental data of particle pseudorapidity distributions in p-p or p-p collisions measured by the above five collaborations [8][9][10][11][12] are analyzed in this paper. We can give the variation law of different parameters from the investigation and predict the pseudorapidity distributions in p-p or p-p collisions at the higher LHC energies.…”

Unified description of multiplicity distributions of final-state particles produced in collisions at high energies

“…The physics picture of the following discussions bases on our multisource ideal gas model [13][14][15], which is mainly used in the descriptions of particle (fragment) emission angles, azimuthal angles, and transverse flows in AA collisions. In the model, many emission sources of particles and fragments are assumed to form in high energy collisions.…”

Target black fragment flows in magnesium-emulsion collisions at 4.5AGeV/c

“…To study nuclear reaction, e.g., magnesium induced nuclear reaction at the Dubna energy, is of great importance. In our recent work (Liu et al, 2004), the experimental angular distributions of target fragments produced in magnesium-emulsion collisions at 4.5A GeV/c (the Dubna synchrophasotron momentum) were reported primarily. To give a systematic investigation on the nuclear fragment emission in magnesium-emulsion collisions at the Dubna energy, the present work performs mainly an investigation of flow characteristics of target black fragments produced in magnesium-emulsion collisions at 4.5A GeV/c.…”