Isospin dependence of relative yields of K{sup +} and K{sup 0} mesons at 1.528A GeV

Journal Article · Mon Jan 15 04:00:00 EST 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.011901· OSTI ID:20990926

Lopez, X; Kim, Y J; Andronic, A; Hartmann, O N; Hildenbrand, K D; Koczon, P; Leifels, Y; Reisdorf, W; Schuettauf, A ^[1]; Herrmann, N; Benabderrahmane, M L; Cordier, E; Merschmeyer, M; Pelte, D ^[2]; Barret, V; Bastid, N; Crochet, P; Dupieux, P ^[3]; Basrak, Z; Caplar, R ^[4]

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1. Gesellschaft fuer Schwerionenforschung, Darmstadt (Germany)
2. Physikalisches Institut der Universitaet Heidelberg, Heidelberg (Germany)
3. Laboratoire de Physique Corpusculaire, IN2P3/CNRS, and Universite Blaise Pascal, Clermont-Ferrand (France)
4. Ruder Boskovic Institute, Zagreb (Croatia)

Results on K{sup +} and K{sup 0} meson production in {sub 44}{sup 96}Ru + {sub 44}{sup 96}Ru and {sub 40}{sup 96}Zr + {sub 40}{sup 96}Zr collisions at a beam kinetic energy of 1.528A GeV, measured with the FOPI detector at GSI-Darmstadt, are investigated as a possible probe of isospin effects in high-density nuclear matter. The measured double ratio (K{sup +}/K{sup 0}){sub Ru}/(K{sup +}/K{sup 0}){sub Zr} is compared to the predictions of a thermal model and a relativistic mean field transport model using two different collision scenarios and under different assumptions on the stiffness of the symmetry energy. We find good agreement with the thermal model prediction and the assumption of a soft symmetry energy for infinite nuclear matter, while more realistic transport simulations of the collisions show a similar agreement with the data but also exhibit a reduced sensitivity to the symmetry term.

• OSTI ID: 20990926
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COLLISIONS
DENSITY
GEV RANGE
HEAVY ION REACTIONS
ISOSPIN
KAONS NEUTRAL
KINETIC ENERGY
MASS NUMBER
MEAN-FIELD THEORY
NUCLEAR MATTER
NUCLEAR MODELS
PARTICLE PRODUCTION
POTASSIUM IONS
RELATIVISTIC RANGE
SYMMETRY
TRANSPORT THEORY