title: Systematic study of strangeness production and   dynamic behaviour with the FOPI experiment  at SIS-18
creator: Zinyuk, Victoria
subject: ddc-530
subject: 530 Physics
description: This work is dedicated to the investigation of in-medium behaviour of strange particles.       In-medium production and propagation of $K^+$  and $K^-$ mesons is studied with the FOPI apparatus    in $^{58}$Ni\,+\,$^{58}$Ni collisions at the incident beam energy of $E_{beam}$= 1.91 AGeV, i.e.     near the strangeness production threshold energies.   Weak in-plane `anti\,-\,flow'  with respect to protons and a slight `squeeze-out'   is found in the azimuthal emission pattern of $K^{+}$ mesons.   $K^{-}$ mesons exhibit an isotropic emission pattern within large statistic uncertainties.   The comparison to the predictions of two independent transport calculations, HSD and IQMD, suggests   a weakly repulsive $KN$ in-medium potential of $U_{KN} = 20 \pm 5$\,MeV and an attractive   $\bar{K}N$ in\,-\,medium potential of $U_{K^{-}N} = -40 \pm 10$\,MeV.       Production of $K^{+/-/0}$, $\phi$ mesons and the $\Lambda$ baryon at normal nuclear matter density     is studied in $\pi^-+A$ reactions with C, Cu and Pb targets at incident beam momentum of $p_{\pi^-}$= 1.7 GeV/$c$.    Differences in the final state phase space distributions measured in heavy and light targets point to     repulsion for $K^+$ and $K^0_S$ mesons in nuclear medium. The latter is solely attributed to the strong interaction.    The corresponding comparison for $K^-$ mesons suggests a strong absorption in nuclear medium.    Observed  $\phi$ meson yields  support the hypothesis of $Z^{\alpha}$\,-\,scaling of the production cross section.
date: 2016
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/20725/1/VZinyukPHDThesis.pdf
identifier: DOI:10.11588/heidok.00020725
identifier: urn:nbn:de:bsz:16-heidok-207259
identifier:   Zinyuk, Victoria  (2016) Systematic study of strangeness production and dynamic behaviour with the FOPI experiment at SIS-18.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/20725/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng