Subthreshold kaon production and the nuclear equation of state

Li, G. Q.; Ko, Che Ming

doi:10.1016/0370-2693(95)00301-z

Cited by 72 publications

(68 citation statements)

References 33 publications

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“…The prerequisite for such an enterprise is of course the fact that K + mesons originate indeed from the early phase and from supra-normal densities. Both features were predicted by transport calculations in the early 90ties [132,91,90,92,133]. At that time experimental data on subthreshold kaon production were scarce and the same was true for the elementary cross sections which serve as input for the transport calculations.…”

Section: Densities and Time Scalesmentioning

confidence: 87%

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Kaon production in heavy ion reactions at intermediate energies

Fuchs¹

2006

Progress in Particle and Nuclear Physics

302

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The article reviews the physics related to kaon and antikaon production in heavy ion reactions at intermediate energies. Chiral dynamics predicts substantial modifications of the kaon properties in a dense nuclear environment. The status of the theoretical predictions as well as experimental evidences for medium effects such as repulsive/attractive mass shifts for K + /K − are reviewed. In the vicinity of the thresholds, and even more pronounced below threshold, the production of strangeness is a highly collective process. Starting from elementary reaction channels the phenomenology of K + and K − production, i.e. freeze-out densities, time scales etc. as derived from experiment and theoretical transport calculations is presented. Below threshold kaon production shows a high sensitivity on the nuclear compression reached in heavy ion reactions. This allows to put constraints on the nuclear equation-of-state which are finally discussed.

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Section: Densities and Time Scalesmentioning

confidence: 87%

“…This allows well defined Lorentz transformations of the kaon and baryon mean fields concerning their scalar-vector structure. In correspondence with the soft/hard Skyrme forces a soft/hard version of the non-linear σω-model [133] with K=200 MeV and K=380 MeV are used to determine the reaction threshold.…”

Section: Shift Of Thresholdsmentioning

confidence: 99%

Kaon production in heavy ion reactions at intermediate energies

Fuchs¹

2006

Progress in Particle and Nuclear Physics

302

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“…Moreover, the maximum baryonic density reached in Au+Au collisions depends on the nuclear compressibility [7,14] whereas in the small C+C system this dependence is very weak [15]. The repulsive K + N potential is assumed to depend nearly (or less than) linearly on the baryonic density [13] and thus reduces the kaon yield accordingly.…”

Section: Microscopic Transport Calculations Indicate That the Yield Omentioning

confidence: 99%

Evidence for a Soft Nuclear Equation-of-State from Kaon Production in Heavy-Ion Collisions

Böttcher²,

et al. 2001

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The production of pions and kaons has been measured in 197 Au+ 197 Au collisions at beam energies from 0.6 to 1.5 A·GeV with the Kaon Spectrometer at SIS/GSI. The K + meson multiplicity per nucleon is enhanced in Au+Au collisions by factors up to 6 relative to C+C reactions whereas the corresponding π ratio is reduced. The ratio of the K + meson excitation functions for Au+Au and C+C collisions increases with decreasing beam energy. This behavior is expected for a soft nuclear equation-of-state.

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“…For instance, at energies available at SIS18/GSI Darmstadt densities up to three times that of ground-state nuclear matter and temperatures up to ∼ 100 MeV can be achieved. In the pioneering work of the KaoS collaboration at SIS18 on sub-threshold kaon production [6] and based on comparisons to transport approaches [7,8] a soft equation of state (EoS) was extracted as predicted already long before [9,10]. A strong focus was put on the study of in-medium properties of kaons and antikaons.…”

Section: Introductionmentioning

confidence: 99%

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Agakishiev¹,

Arnold²,

Bałanda³

et al. 2014

Eur. Phys. J. A

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Abstract. Results on Λ hyperon production are reported for collisions of p (3.5 GeV) + Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. The transverse mass distributions in rapidity bins are well described by Boltzmann shapes with a maximum inverse slope parameter of about 90 MeV at a rapidity of y = 1.0, i.e. slightly below the center-of-mass rapidity for nucleonnucleon collisions, ycm = 1.12. The rapidity density decreases monotonically with increasing rapidity within a rapidity window ranging from 0.3 to 1.3. The Λ phase-space distribution is compared with results of other experiments and with predictions of two transport approaches which are available publicly. None of the present versions of the employed models is able to fully reproduce the experimental distributions, i.e. in absolute yield and in shape. Presumably, this finding results from an insufficient modelling in the transport models of the elementary processes being relevant for Λ production, rescattering and absorption. The present high-statistics data allow for a genuine two-dimensional investigation as a function of phase space of the self-analyzing Λ polarization in the weak decay Λ → pπ − . Finite negative values of the polarization in the order of 5 − 20 % are observed over the entire phase space studied. The absolute value of the polarization increases almost linearly with increasing transverse momentum for pt > 300 MeV/c and increases with decreasing rapidity for y < 0.8. PACS.25.75.Dw, 25.75.Gz

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Subthreshold kaon production and the nuclear equation of state

Cited by 72 publications

References 33 publications

Kaon production in heavy ion reactions at intermediate energies

Kaon production in heavy ion reactions at intermediate energies

Evidence for a Soft Nuclear Equation-of-State from Kaon Production in Heavy-Ion Collisions

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

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