K+ production in the reaction 58Ni+58Ni at incident energies from 1 to 2 A GeV

Best, D.; Herrmann, N.; Hong, B.; Kirejczyk, M.; Ritman, J.; Wisniewski, K.; Zhilin, A.; Gobbi, A.; Hildenbrand, K. D.; Leifels, Y.; Pinkenburg, C.; Reisdorf, W.; Schüll, D.; Sodan, U.; Wang, G. S.; Wienold, T.; Alard, J. P.; Amouroux, V.; Bastid, N.; Belyaev, I.; Berek, G.; Biegansky, J.; Cherbatchev, R.; Coffin, J. P.; Crochet, P.; Dupieux, P.; Fodor, Z.; Genoux-Lubain, A.; Goebels, G.; Guillaume, G.; Häfele, E.; Jundt, F.; Kecskemeti, J.; Korchagin, Y.; Kotte, R.; Kuhn, C.; Lebedev, A.; Lebedev, A.; Legrand, I.; Maazouzi, C.; Manko, V.; Mösner, J.; Mohren, S.; Moisa, D.; Neubert, W.; Pelte, D.; Petrovici, M.; Pras, P.; Rami, F.; Roy, C.; Seres, Z.; Sikora, B.; Simion, V.; Siwek-Wilczyska, K.; Smolyankin, V.; Somov, A.; Tizniti, L.; Trzaska, M.; Vasiliev, M. A.; Wagner, P.; Wohlfarth, D.

K+ production in the reaction 58Ni+58Ni at incident energies from 1 to 2 A GeV

Best, D.; Herrmann, N.; Hong, B.; Kirejczyk, M.; Ritman, J.; Wisniewski, K.; Zhilin, A.; Gobbi, A.; Hildenbrand, K. D.; Leifels, Y.; Pinkenburg, C.; Reisdorf, W.; Schüll, D.; Sodan, U.; Wang, G. S.; Wienold, T.; Alard, J. P.; Amouroux, V.; Bastid, N.; Belyaev, I.; Berek, G.; Biegansky, J.; Cherbatchev, R.; Coffin, J. P.; Crochet, P.; Dupieux, P.; Fodor, Z.; Genoux-Lubain, A.; Goebels, G.; Guillaume, G.; Häfele, E.; Jundt, F.; Kecskemeti, J.; Korchagin, Y.; Kotte, R.; Kuhn, C.; Lebedev, A.; Lebedev, A.; Legrand, I.; Maazouzi, C.; Manko, V.; Mösner, J.; Mohren, S.; Moisa, D.; Neubert, W.; Pelte, D.; Petrovici, M.; Pras, P.; Rami, F.; Roy, C.; Seres, Z.; Sikora, B.; Simion, V.; Siwek-Wilczyska, K.; Smolyankin, V.; Somov, A.; Tizniti, L.; Trzaska, M.; Vasiliev, M. A.; Wagner, P.; Wohlfarth, D.

Semi-inclusive triple differential multiplicity distributions of positively charged kaons have been measured over a wide range in rapidity and transverse mass for central collisions of 58Ni with 58Ni nuclei. The transverse mass (mt) spectra have been studied as a function of rapidity at a beam energy 1.93 A GeV. The mt distributions of K+ mesons are well described by a single Boltzmann-type function. The spectral slopes are similar to that of the protons indicating that rescattering plays a significant role in the propagation of the kaon. Multiplicity densities have been obtained as a function of rapidity by extrapolating the Boltzmann-type fits to the measured distributions over the remaining phase space. The total K+ meson yield has been determined at beam energies of1.06, 1.45, and 1.93 A GeV, and is presented in comparison to existing data. The low total yield indicates that the K+ meson can not be explained within a hadro-chemical equilibrium scenario, therefore indicating that the yield does remain sensitive to effects related to its production processes such as the equation of state of nuclear matter and/or modifications to the K+ dispersion relation.

Keywords: Kaon; Thermal model; Radial flow

Nuclear Physics A 625(1-2) (1997) 307-324

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