dorsal/arxiv
View SchemaLow Freeze-out Temperature and High Collective Velocities in Relativistic Heavy-Ion Collisions
| Authors | J. Rayford Nix |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9801029 |
| URL | https://arxiv.org/abs/nucl-th/9801029 |
| DOI | 10.1103/PhysRevC.58.2303 |
| Journal | Phys.Rev.C58:2303-2310,1998 |
Abstract
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.
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"abstract": "On the basis of a nine-parameter expanding source model that includes special\nrelativity, quantum statistics, resonance decays, and freeze-out on a realistic\nhypersurface in spacetime, we analyze in detail invariant pi+, pi-, K+, and K-\none-particle multiplicity distributions and pi+ and K+ two-particle\ncorrelations in nearly central collisions of Si + Au at a laboratory bombarding\nenergy per nucleon of 14.6 GeV/c. By considering separately the one-particle\ndata and the correlation data, we find that the central baryon density, nuclear\ntemperature, transverse collective velocity, longitudinal collective velocity,\nand source velocity are determined primarily by one-particle multiplicity\ndistributions and that the transverse radius, longitudinal proper time, width\nin proper time, and pion incoherence fraction are determined primarily by\ntwo-particle correlations. By considering separately the pion data and the kaon\ndata, we find that although the pion freeze-out occurs somewhat later than the\nkaon freeze-out, the 99% confidence-level error bars associated with the two\nfreeze-outs overlap. These and other detailed studies confirm our earlier\nconclusion based on the simultaneous consideration of the pion and kaon\none-particle and correlation data that the freeze-out temperature is less than\n100 MeV and that both the longitudinal and transverse collective\nvelocities--which are anti-correlated with the temperature--are substantial. We\nalso discuss the flaws in several previous analyses that yielded a much higher\nfreeze-out temperature of approximately 140 MeV for both this reaction and\nother reactions involving heavier projectiles and/or higher bombarding\nenergies.",
"arxiv_id": "nucl-th/9801029",
"authors": [
"J. Rayford Nix"
],
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"doi": "10.1103/PhysRevC.58.2303",
"journal_ref": "Phys.Rev.C58:2303-2310,1998",
"title": "Low Freeze-out Temperature and High Collective Velocities in Relativistic Heavy-Ion Collisions",
"url": "https://arxiv.org/abs/nucl-th/9801029"
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