Measurements have been made of inclusive 525 GeV π− interactions in emulsion. The results are compared to proton-emulsion and lower energy pion-emulsion data. Average multiplicities of relativistic shower particles increase with increasing energy, although with a somewhat steeper slope above 60 GeV than at lower energies. The ratio 〈ns〉p/〈ns〉π∼1.1 over the energy range 60–525 GeV. The ratio of the dispersion in the multiplicity distribution to the average multiplicity is the same for proton and pion collisions in emulsion, and is independent of projectile energy. The shape of the shower particle multiplicity distribution does not vary significantly with energy, and KNO scaling appears to hold over the energy range 60–525 GeV. The shower particle pseudorapidity distributions are independent of the beam energy in the target and projectile fragmentation regions, and both the pseudorapidity and multiplicity distributions agree reasonably well with the fritiof model predictions for 525 GeV pions. The dependence of the shower particle multiplicity 〈ns〉 on the number of heavy tracks Nh appraoches saturation as the total shower particle energy becomes a significant fraction of √s , and the pseudorapidity distributions shift toward smaller 〈η〉 with increasing numbers of grey and black tracks at 525 GeV. Neither the average number 〈Nh〉 nor the multiplicity distributions of the heavily ionizing tracks vary significantly with energy, and the normalized angular distributions of grey and black tracks are independent of the type of projectile or projectile energy.
NUCLEUS means average nuclei of BR-2 emulsion.
NUCLEUS means average nuclei of BR-2 emulsion.
NUCLEUS means average nuclei of BR-2 emulsion.
Experimental results on some characteristics of high multiplicity (≧45) proton-AgBr interactions at 800 GeV are presented. The results are compared with those in lower multiplicity regions as well as for CNO target. The various parameters investigated here are pseudorapidity distribution, mean normalised multiplicity, mean number of intranuclear collisions and normalised pseudorapidity.
NUCLEUS IS AgBr (NUMBER(HTRACK) >= 9).
NUCLEUS IS CNO (2 <= NUMBER(HTRACK) <= 5).
The mean free path for inelastic interactions of 6Li in emulsion is measured and found not to be in systematic agreement with the different known theoretical parameterizations. This may be attributed to the loosely bound structure of 6Li nuclei. Possible internal structures of 6Li nuclei are investigated via the analysis of the shower particles multiplicity distributions for inclusive and central 6Li-Em interactions. In this analysis the experimental P-Em, d-Em and α-Em data are used as inputs for folding the corresponding distributions for 6Li-Em interactions. The results from central collisions favour the (α + d) cluster structure for the incident 6Li nuclei.
INTERACTION WITH EMULSION NUCLEUS WAS MEASURED.
INTERACTION WITH average AgBr NUCLEUS WAS MEASURED.
INTERACTION WITH average AgBr NUCLEUS WAS MEASURED.
Inclusive double differential multiplicities d2N/dy dpt and related quantities have been measured for protons and deuterons produced in 14.6A GeV/c Si+Al and Si+Pb collisions using the E814 forward spectrometer at the AGS at BNL. Collision ‘‘centrality’’ is determined by measuring Nc, the total charged particle multiplicity in the pseudorapidity range 0.85<η<3.8. For both systems Si + Al and Si + Pb, an increase in the proton rapidity distribution dN/dy at midrapidity and a corresponding decrease at higher rapidities are observed with increasing Nc. For Si+Pb, Boltzmann slope parameters TB increase significantly in the most central collisions. The measured distributions exhibit a centrality dependence even when σ/σgeo≲10%, where full overlap between the Si and Pb nuclei occurs in a simple geometric picture. The proton rapidity distribution dN/dy is presented for the symmetric system Si+Al over the entire rapididty interval. The total number of protons, which is the integral of this quantity over rapidity, varies with Nc. Results are compared with various model calculations, mostly using the hadronic cascade codes ARC and RQMD. No significant nuclear transparency is observed, indicating that large baryon and energy densities are produced in these collisions.
No description provided.
The power-law relation between higher order and second order scaled factorial moments has been investigated for secondary particles produced in interactions of 800 GeV protons with emulsion nuclei in one-dimensional (pseudorapidity and azimuthal angle) and two-dimensional (pseudorapidity and azimuthal angle) spaces for three multiplicity intervals. The moment power law is found to be independent of multiplicity cuts and phase space dimension. A universal scaling exponent is determined which indicates that there is no second-order phase transition in the interactions. The ratios of higher-order anomalous fractal dimensions with respect to the second-order anomalous fractal dimension are well represented by the Lévy-stable distribution and give clear evidence of a self-similar cascading mechanism in the interactions.
No description provided.
We compute the multifractal moments Gq in terms of a new scaled variable X suggested by Bialas and Gazdzicki to study the dynamical fluctuations of particles produced in the interactions of Au197 at 10.6A GeV with nuclear emulsion. An asymptotic power-law dependence of the moments on the bin size δX has been observed in pseudorapidity (η), azimuthal (φ), and η-φ phase spaces. The dynamical values of the generalized dimensions are determined in all the phase spaces. The dynamical properties of the produced particles are mapped onto smooth multifractal spectra f(Δαq) by excluding the statistical contribution. The Au197 results are compared with a Si28 ion at 14.5A GeV and a S32 beam at 200A GeV.
No description provided.
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NET BARYON DENSITY D(N)/D(Y) HAS BEEN DETERMINED AT THE RAPIDITY OF NN C.M.S., FOR NET BARYON THE FORMULAR: 2*(P-PBAR)+1.6*(LAMBDA- LAMBDABAR) HAS BEEN USED.
No description provided.
In this paper the main experimental results on some significant physical quantities obtained in He−Li collisions at 4.5A GeV/c are presented. The experiments have been performed at the Syncrophasotron from JINR Dubna, in the frame of the SKM 200 Collaboration.
No description provided.
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The production of neutral pions has been studied in the reactions 40 Ar + nat Ca , 86 Kr + nat Zr and 197 Au + 197 Au at 1 A GeV. For high energy pions emitted from the heavier systems a steeper than linear rise of the pion multiplicity with the centrality of the reaction is observed, indicating a pion production process other than binary nucleon-nucleon collisions. At low transverse momenta an enhancement of the π 0 -multiplicity increasing with the mass of the collision system is found. Systematic discrepancies between the experimental results and recent BUU, QMD and Cascade calculations are discussed.
No description provided.
RESULTS OF AN EXTRAPOLATION TO THE FULL SOLID ANGLE TAKING THE EXPERIMENTALTEMPERATURES INTO ACCOUNT.
No description provided.
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