271. EDV-Basisdokumentation in der Chirurgischen Klinik

Stock, Wolfgang G.; Nitzschke, E.; Troitzsch, M.; Heide, U. Meyer auf der; Mackrodt, H. G.

doi:10.1007/bf01287104

Cited by 2 publications

(3 citation statements)

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“…Using the freeze-out parameters relevant for SIS energies we can compare the results with the previous findings for AGS [33,34] and SPS [35][36][37][38] energies. The chemical freeze-out points in the (T − µ B ) plane for relativistic heavy ion collisions are shown in Fig.…”

Section: B Central Collisionsmentioning

confidence: 83%

Influence of impact parameter on thermal description of relativistic heavy ion collisions at(1–2)A GeV

1999

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Attention is drawn to the role played by the size of the system in the thermodynamic analysis of particle yields in relativistic heavy ion collisions at SIS energies. This manifests itself in the non-linear dependence of K + and K − yields in AA collisions at 1 -2 A·GeV on the number of participants. It is shown that this dependence can be quantitatively well described in terms of a thermal model with a canonical strangeness conservation. The measured particle multiplicity ratios (πin central Au-Au and Ni-Ni collisions at 0.8 -2.0 A·GeV are also explained in the context of a thermal model with a common freeze-out temperature and chemical potential. Including the concept of collective flow a consistent picture of particle energy distributions is derived with the flow velocity being strongly impact-parameter dependent.

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Section: B Central Collisionsmentioning

confidence: 83%

Influence of impact parameter on thermal description of relativistic heavy ion collisions at(1–2)A GeV

1999

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“…Fig. 5 shows our results within the phase diagram of hadronic matter together with other (T C , µ B ) values obtained from particle-production experiments at SIS, AGS, and SPS energies [14,15,17,42]. The data points are connected by a line to symbolize the chemical freeze-out curve of hadronic matter.…”

Section: Determination Of the Model Parameters From Experimental Datamentioning

confidence: 90%

“…Fig. 6 shows the calculated relative populations of baryon species at chemical freeze-out as a function of the energy available in the nucleon-nucleon system together with the system-size averaged relative meson multiplicities < M π 0 ,η > / < A part > as given in Tab [14,15,17,42]. The solid curve through these data points represents the curve for chemical freeze-out of hadronic matter.…”

Section: Determination Of the Model Parameters From Experimental Datamentioning

confidence: 99%

Neutral pions and η mesons as probes of the hadronic fireball in nucleus-nucleus collisions around1AGeV

et al. 2003

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Chemical and thermal freeze-out of the hadronic fireball formed in symmetric collisions of light, intermediate-mass, and heavy nuclei at beam energies between 0.8A GeV and 2.0A GeV are discussed in terms of an equilibrated, isospin-symmetric ideal hadron gas with grand-canonical baryon-number conservation. For each collision system the baryochemical potential µ B and the chemical freeze-out temperature T c are deduced from the inclusive π 0 and η yields which are augmented by interpolated data on deuteron production.With increasing beam energy µ B drops from 800 MeV to 650 MeV, while T c rises from 55 MeV to 90 MeV. For given beam energy µ B grows with system size, whereas T c remains constant. The centrality dependence of the freezeout parameters is weak as exemplified by the system Au + Au at 0.8A GeV.For the highest beam energies the fraction of nucleons excited to resonance states reaches freeze-out values of nearly 15%, suggesting resonance densities close to normal nuclear density at maximum compression. In contrast to the particle yields, which convey the status at chemical freeze-out, the shapes of the related transverse-mass spectra do reflect thermal freeze-out. The observed thermal freeze-out temperatures T th are equal to or slightly lower than 1 T c , indicative of nearly simultaneous chemical and thermal freeze-out.PACS numbers: 24.10. Pa, 25.75.Dw

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271. EDV-Basisdokumentation in der Chirurgischen Klinik

Cited by 2 publications

References 0 publications

Influence of impact parameter on thermal description of relativistic heavy ion collisions at(1–2)A GeV

Influence of impact parameter on thermal description of relativistic heavy ion collisions at(1–2)A GeV

Neutral pions and η mesons as probes of the hadronic fireball in nucleus-nucleus collisions around1AGeV

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