The observation of collective effects in central C–Ne and C–Cu collisions at a momentum of 4.5 GeV/c per nucleon[Phys. Lett. B 411 (1997) 26]

Collective flow of protons and negative pions in nucleus–nucleus collisions at momentum of

“…In mimicking, in particular, the deterioration of experimental efficiency for registering vertical tracks, protons characterized by deep angles greater than 60 • have been excluded from an analysis. In the past, it has been found that the applied filters selected peaked distributions of impact parameters for the collision events, characterized by the average b-values of: b = 2.80 fm and b = 2.65 fm for semicentral He-C and C-C events [27], respectively, b = 2.20 fm and b = 2.75 fm for central C-Ne and C-Cu [24,25], respectively, and b = 6.54 fm for C-Ta semicentral. For the present study, all events have been generated at fixed b-values equal to the above averages, with event numbers given in Table 1.…”

“…At JINR in Dubna, emulsion techniques have been employed to investigate the directed flow of projectile spectator fragments in the interactions of O, Ne, Si, S, Kr, Au and Pb with Ag(Br) targets at beam momenta of 0.95, 4.5, 11.6 and 14.5 A GeV/c [23]. Moreover, the flow of protons and π − mesons has been studied at JINR in the central C-Ne and C-Cu collisions at beam momentum of 4.5 A GeV/c [24,25], using the streamer chamber of the SKM-200-GIBS collaboration, and in the semicentral C-C [26,27] and C-Ta [28] collisions at beam momentum of 4.2 A GeV/c, using the 2 m Propane Bubble Chamber. In those sets of flow investigations, on one hand the method of Danielewicz and Odyniec has been employed [24,25,27] and, on the other, the method of Fourier expansion of azimuthal distributions [26,28].…”

Study of azimuthal correlations in the target fragmentation region in p, d, He, C+C, Ta and C+Ne, Cu collisions at momenta of 4.2, 4.5 and 10 A GeV/c

“…During last years we have analyzed our experimental data following the method [15,16] ables and their dependencies on the transverse momentum of all secondary charged particles in the azimuthal plane, were studied to reveal a nontrivial effects in nucleusnucleus collisions [17]- [21]. We have investigated multiparticle azimuthal correlations of protons and pions in central and minimal bias inelastic collisions (4.2, 4.5 and 10 GeV/c/nucleon) within two experimental setups -2 m streamer chamber placed in a magnetic field (SKM-200-GIBS) and 2 m Propane Bubble Chamber (PBC-500) of JINR.…”

“…We have investigated multiparticle azimuthal correlations of protons and pions in central and minimal bias inelastic collisions (4.2, 4.5 and 10 GeV/c/nucleon) within two experimental setups -2 m streamer chamber placed in a magnetic field (SKM-200-GIBS) and 2 m Propane Bubble Chamber (PBC-500) of JINR. In order to investigate the mechanism of nucleusnucleus interactions we have studied the correlations of these particles (protons, pions, Λ-hyperons) with respect to the reaction plane (directed and elliptic flows) [17]- [19], as well as with respect to the opening angle between particles emitted in the forward and backward hemispheres [20,21].…”

Anisotropic Collective Flow of Lambda Hyperons Produced in C + C Collisions at 4.2 AGeV/c

“…We also examine spectral temperatures of protons and π − mesons produced in association with Λ hyperons. The anisotropic flows of protons and of π − mesons have been studied before, on their own, in the C-induced collisions at 4.2-4.5 AGeV/c in Dubna, specifically by the PBS-500 and the SKM-200-GIBS Collaborations in the semicentral C + C collisions [9] and in the central C + Ne and C + Cu collisions [10,11].…”