(Anti)Proton and Pion Source Sizes and Phase Space Densities in Heavy Ion Collisions

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dc.creatorMurray, Michael
dc.date2000-08-09
dc.date2001-01-23
dc.date.accessioned2026-07-07T12:38:22Z
dc.date.available2026-07-07T12:38:22Z
dc.descriptionNA44 has measured mid-rapidity deuteron spectra from AA collisions at sqrt{s}=18GeV/A at the CERN SPS. Combining these spectra with published proton, antiproton and antideuteron data allows us to calculate, within a coalescence framework, proton and antiproton source sizes and phase space densities. These results are compared to pion source sizes and densities, pA results and to lower energy (AGS) data. The antiproton source is larger than the proton source at sqrt{s}=18GeV/A. The phase space densities of pions and protons are not constant but grow with system size. Both pi+ and proton radii decrease with transverse mass and increase with sqrt{s}. Pions and protons do not freeze-out independently. The nature of their interaction changes as sqrt{s}, and the pion/proton ratio increases.
dc.description4 pages, Latex 2.09, 3 eps figures. Changes for January 2001. The proton source size is now calculated assuming a more realistic Hulthen, rather than Gaussian, wavefunction. A new figure shows the effect of this change which is important for small radii. A second new figure shows the results of RQMD calculations of the proton source size and phase density. Because of correlations between position and momentum coalesence does not show the full proton source size. The paper has been streamlined and readability improved
dc.identifierhttps://arxiv.org/abs/nucl-ex/0008006
dc.identifierhttp://arxiv.org/abs/nucl-ex/0008006
dc.identifierPhys.Rev.C63:054901,2001
dc.identifierdoi:10.1103/PhysRevC.63.054901
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218738
dc.subjectNuclear Experiment
dc.title(Anti)Proton and Pion Source Sizes and Phase Space Densities in Heavy Ion Collisions
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