Pion and kaon emission from the fireball formed in Ne + NaF collisions at 1–2 GeV/nucleon

Data on hadronic particle production in symmetric nuclear collisions from SIS/BEVALAC to SPS energies are reviewed. The main emphasis is put on the production of pions, kaons, and antibaryons. Global features will be discussed in terms of rapidity and transverse momentum distributions and the total energy stored in produced particles. Pion and kaon production probabilities are studied as function of beam energy and their distribution in polar and azimuthal angle. Special emphasis is put on medium effects expected for kaons in dense nuclear matter at low energies. An enhanced strange particle yield is found at all energies, its explanation at SPS energies is still controversial. Experimental data on antibaryon and multistrange hyperon production is less complete and does not allow for similar systematic studies.

Section: Transverse Momentum Distributionsmentioning

confidence: 99%

Section: Kaon Production Probabilitiesmentioning

confidence: 99%

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Hadronic particle production in nucleus-nucleus collisions

Senger¹,

Ströbele

1999

“…Three different collision systems have been investigated (Au+Au, Ni+Ni, and C+C) at incident beam energies ranging from 0.6 AGeV to 2.0 AGeV. Results have been published in [5,6,7,8,9,10,11,12,13] and will in part be presented in this contribution.…”

Section: Introductionmentioning

confidence: 99%

Review of the results of the KaoS Collaboration

Foerster¹,

Boettcher²,

Dohrmann³

et al. 2005

112

Abstract. The production of K + and of K − mesons in heavy-ion collisions at beam energies of 1 to 2 AGeV has systematically been investigated with the Kaon Spectrometer KaoS. The ratio of the K + production excitation function for Au+Au and for C+C reactions increases with decreasing beam energy, which is expected for a soft nuclear equation-of-state. A comprehensive study of the K + and of the K − emission as a function of the size of the collision system, of the collision centrality, of the kaon energy, and of the polar emission angle has been performed. The K − /K + ratio is found to be nearly constant as a function of the collision centrality and can be explained by the dominance of strangeness exchange. On the other hand the spectral slopes and the polar emission patterns are different for K − and for K + . Furthermore the azimuthal distribution of the particle emission has been investigated. K + mesons and pions are emitted preferentially perpendicular to the reaction plane as well in Au+Au as in Ni+Ni collisions. In contrast for K − mesons in Ni+Ni reactions an in-plane flow was observed for the first time at these incident enegies.

“…Three different collision systems have been investigated (Au+Au, Ni+Ni, and C+C) at incident beam energies ranging from 0.6 AGeV to 2.0 AGeV. Results have been published in [6,7,8,9,10,11,3,12] and will in part be presented in this contribution.…”

Section: Introductionmentioning

confidence: 99%

K⁺- and K-production in heavy-ion collisions at SIS energies

Förster

Böttcher²,

Grosse

et al. 2003

Abstract. The production and the propagation of K + -and of K − -mesons in heavyion collisions at beam energies of 1 to 2 AGeV have systematically been investigated with the Kaon Spectrometer KaoS at the SIS at the GSI. The ratio of the K + -production excitation function for Au+Au and for C+C reactions increases with decreasing beam energy, which is expected for a soft nuclear equation-of-state. At 1.5 AGeV a comprehensive study of the K + -and of the K − -emission as a function of the size of the collision system, of the collision centrality, of the kaon energy, and of the polar emission angle has been performed. The K − /K + ratio is found to be nearly constant as a function of the collision centrality. The spectral slopes and the polar emission patterns are different for K − and for K + . These observations indicate that K + -mesons decouple earlier from the reaction zone than K − -mesons.