Subthreshold Production of Kaons and Antikaons in Nucleus-Nucleus Collisions at Equivalent Beam Energies

Barth, Rolf F.; Senger, P.; Ahner, W.; Beckerle, P.; Bormann, C.; Brill, Dieter R.; Cieślak, M.; Dębowski, M.; Grosse, E.; Koczoń, P.; Kohlmeyer, B.; Miśkowiec, D.; Müntz, C.; Oeschler, H.; Pühlhofer, F.; Schwab, E.; Schicker, R.; Shin, Y.; Speer, John G.; Ströbele, H.; Sturm, C.; Völkel, K.; Wagner, A.; Waluś, W.

doi:10.1103/physrevlett.78.4007

Cited by 188 publications

(175 citation statements)

References 23 publications

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“…Studies with a variety of models [3,4] indicate that the antikaon potential is attractive while the kaons feel a repulsive potential in nuclear matter. However, the analysis of available data on K + production from heavy ion collisions at SIS energies [5,6] contradicts the predictions that the kaon potential is repulsive. The comparison between the heavy ion calculations and the data [6,7,8] indicates that the K + -meson spectra are best described by neglecting any in-medium modification of the kaon properties.…”

Section: Introductionmentioning

confidence: 76%

“…Since in heavy ion collisions at SIS energies [5,9] the K + -mesons are predominantly produced by secondary pions, we investigate the kaon production reactions, π + N → Λ, Σ + K, in nuclear matter. We calculate the in-medium reaction amplitudes, taking into account the scalar and vector potentials for incident, final and intermediate mesons and baryons.…”

Section: Introductionmentioning

confidence: 99%

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Kaon properties and cross sections in the nuclear medium

Tsushima¹,

Sibirtsev²,

Thomas³

2001

J. Phys. G: Nucl. Part. Phys.

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Abstract. Results for the π + N → Λ, Σ + K reactions in nuclear matter of Ref.[1] are presented. To evaluate the in-medium modification of the reaction amplitude as a function of the baryonic density we introduce relativistic, meanfield potentials for the initial, final and intermediate mesonic and baryonic states in the resonance model. These vector and scalar potentials were calculated using the quark meson coupling model. Contrary to earlier work which has not allowed for the change of the cross section in medium, we find that the data for kaon production at SIS energies are consistent with a repulsive K + -nucleus potential.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Kaon properties and cross sections in the nuclear medium

Tsushima¹,

Sibirtsev²,

Thomas³

2001

J. Phys. G: Nucl. Part. Phys.

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“…K + production from Ni-Ni collisions. The approximate total experimental cross sections are from Reference [20]. To obtain the flux for Ni, the flux of Fe was used but multiplied by 0.05, which is the average ratio of the abundance of Ni to Fe over all energy intervals [11].…”

Section: An Example Transport Calculationmentioning

confidence: 99%

Threshold meson production and cosmic ray transport

Norbury¹,

Townsend²,

Norman³

2006

J. Phys. G: Nucl. Part. Phys.

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Abstract. An interesting accident of nature is that the peak of the cosmic ray spectrum, for both protons and heavier nuclei, occurs near the pion production threshold. The Boltzmann transport equation contains a term which is the cosmic ray flux multiplied by the cross section. Therefore when considering pion and kaon production from proton-proton reactions, small cross sections at low energy can be as important as larger cross sections at higher energy. This is also true for subthreshold kaon production in nuclear collisions, but not for subthreshold pion production.PACS numbers: 96.50. 96.50.sb, 96.50.sd, 96.50.Vg, 13.85.Qk, 13.60.Le

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“…The momentum dependence of kaon optical potentials in a nuclear medium has also been discussed, which may serve as unified understanding of these phenomena [31][32][33]. Although there is still a debate concerning the strength of the kaon optical potential, recent experimental results on the subthreshold K + K − production in relativistic heavy-ion collisions and proton-nucleus collisions suggest a substantial decrease in the antikaon effective mass [34][35][36]. Based on the strongly attractive kaonic potential, a possibility of kaonic nuclei has been proposed [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Kaonic modes in hyperonic matter and p-wave kaon condensation

Muto

2002

Nuclear Physics A

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Kaon excitations (kaonic modes) are investigated in hyperonic matter, where hyperons (Λ, Σ − , Ξ − ) are mixed in the ground state of neutron-star matter. P -wave kaon-baryon interactions as well as the s-wave interactions are taken into account within chiral effective Lagrangian, and the nonrelativistic effective baryon-baryon interactions are incorporated. When the hyperon Λ is more abundant than the proton at high baryon density, a proton-particle-Λ-hole mode, which has the K + quantum number, appears in addition to other particle-hole modes with the K − quantum number. It is shown that the system becomes unstable with respect to a spontaneous creation of a pair of the particle-hole modes with K + and K − quantum numbers, stemming from the p-wave kaon-baryon interaction. The onset density of this p-wave kaon condensation may be lower than that of the s-wave K − condensation.

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Subthreshold Production of Kaons and Antikaons in Nucleus-Nucleus Collisions at Equivalent Beam Energies

Cited by 188 publications

References 23 publications

Kaon properties and cross sections in the nuclear medium

Kaon properties and cross sections in the nuclear medium

Threshold meson production and cosmic ray transport

Kaonic modes in hyperonic matter and p-wave kaon condensation

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