Low Freeze-out Temperature and High Collective Velocities in Relativistic Heavy-Ion Collisions
| dc.creator | Nix, J. Rayford | |
| dc.date | 1998-01-17 | |
| dc.date.accessioned | 2026-07-07T11:11:32Z | |
| dc.date.available | 2026-07-07T11:11:32Z | |
| dc.description | On the basis of a nine-parameter expanding source model that includes special relativity, quantum statistics, resonance decays, and freeze-out on a realistic hypersurface in spacetime, we analyze in detail invariant pi+, pi-, K+, and K- one-particle multiplicity distributions and pi+ and K+ two-particle correlations in nearly central collisions of Si + Au at a laboratory bombarding energy per nucleon of 14.6 GeV/c. By considering separately the one-particle data and the correlation data, we find that the central baryon density, nuclear temperature, transverse collective velocity, longitudinal collective velocity, and source velocity are determined primarily by one-particle multiplicity distributions and that the transverse radius, longitudinal proper time, width in proper time, and pion incoherence fraction are determined primarily by two-particle correlations. By considering separately the pion data and the kaon data, we find that although the pion freeze-out occurs somewhat later than the kaon freeze-out, the 99% confidence-level error bars associated with the two freeze-outs overlap. These and other detailed studies confirm our earlier conclusion based on the simultaneous consideration of the pion and kaon one-particle and correlation data that the freeze-out temperature is less than 100 MeV and that both the longitudinal and transverse collective velocities--which are anti-correlated with the temperature--are substantial. We also discuss the flaws in several previous analyses that yielded a much higher freeze-out temperature of approximately 140 MeV for both this reaction and other reactions involving heavier projectiles and/or higher bombarding energies. | |
| dc.description | 14 pages. RevTeX 3.1. Submitted to Physical Review C. PostScript version available at http://t2.lanl.gov/publications/publications.html or at ftp://t2.lanl.gov/pub/publications/lft | |
| dc.identifier | https://arxiv.org/abs/nucl-th/9801029 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/9801029 | |
| dc.identifier | Phys.Rev.C58:2303-2310,1998 | |
| dc.identifier | doi:10.1103/PhysRevC.58.2303 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/191126 | |
| dc.subject | Nuclear Theory | |
| dc.title | Low Freeze-out Temperature and High Collective Velocities in Relativistic Heavy-Ion Collisions | |
| dc.type | text |