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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 41: Heavy Ions IV

HK 41.4: Group Report

Thursday, March 11, 2004, 15:00–15:30, E

The Density Dependence of the Isovector EOS in Heavy Ion Collisions* — •H.H. Wolter1, Th. Gaitanos1,2, V. Baran2,3, M. Colonna2, M. Di Toro2, and Chr. Fuchs41Sektion Physik, Univ. of Munich — 2Lab. Naz. del Sud, INFN, Catania — 3NIPNE and Bucharest Univ. — 4Inst. Theor. Phys., Univ. Tübingen

The density dependence of the isovector equation-of-state of nuclear matter is important for nuclear structure of rare isotopes, for heavy ion collisions of asymmetric nuclei, and for astrophysical processes like neutron star cooling of supernova nucleosynthesis. On the other hand it is not well contrained from nuclear matter theories. Heavy ion collisions offer the possiblility to explore the isovector eos for low densities in fragmentation reactions and for high densities in flow phenomena and particle production. Our invstigations of the high density eos are performed in the framework of relativistic transport calculations, where in the isovector sector the ρ and δ mesons enter, where the effect of the latter is enhanced in heavy ion collisions. Different observables have been investigated and will be discussed in comparison with the rather sparse experimental data. These include flow observables v1, v2, pion production, and ratios of p/n or 3He/t emmissions, e.g. in the Ru/Zr system. We see an observable sensitivity on the isovector eos, which suggests the investigation of even more asymmetric heavy ion collision of radiactive nuclei in the future.
* supported by BMBF, contract 06 LM 981.

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