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

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

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Abstract

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 of 1.06, 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.

Original languageEnglish
Pages (from-to)307-324
Number of pages18
JournalNuclear Physics A
Volume625
Issue number1-2
DOIs
Publication statusPublished - 1997 Oct 27

Keywords

  • Kaon
  • Radial flow
  • Thermal model

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    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., ... Yushmanov, I. (1997). K+ production in the reaction 58Ni+58Ni at incident energies from 1 to 2 a GeV. Nuclear Physics A, 625(1-2), 307-324. https://doi.org/10.1016/S0375-9474(97)00409-0