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@TECHREPORT{Schepers:864903,
      author       = {Schepers, G.},
      title        = {{A}ssoziierte {S}trangeness-{E}rzeugung an der
                      {P}roduktionsschwelle in der {R}eaktion pp $\rightarrow$
                      p{K}$^{+}\Lambda$ am {E}xperiment {COSY}-11 mit einer
                      optimierten {S}trahloptik},
      volume       = {3586},
      number       = {Juel-3586},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich, Zentralbibliothek, Verlag},
      reportid     = {FZJ-2019-04506, Juel-3586},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {II, 94 p.},
      year         = {1998},
      abstract     = {Using the experimental setup ofthe COSY-11 facility the
                      energy dependence of the total cross section for the pp
                      $\rightarrow$ pK$^{+}\Lambda$-reaction was measured in the
                      threshold region covering the excess energy range up to 7
                      MeV. The slope of the measured cross sections is described
                      well by model calculations, but the rate is underestimated
                      by a factor of two to three. A special and precise
                      determination of the proton beam momentum of the
                      COSY-synchrotron using the measured data themselves was
                      performed. Investigations of the differential cross sections
                      Show that s-wave production is dominant in the pp
                      $\rightarrow$ pK$^{+}\Lambda$-reaction near threshold. By
                      comparing model phase-space Dalitz plot occupations with the
                      experimental ones, constraints on the spin-averaged
                      $\Lambda$p scattering lenght and effective rang have been
                      obtained. The low energy $\Lambda$p scattering parameters
                      could be determined when combining the position of the
                      virtual bound state in the $\Lambda$p system with data from
                      elastic $\Lambda$p scattering measurements, together with
                      the fact that the hyperdeuteron is not bound. A major
                      intension was given for the development and installation of
                      a special magnet optics for the COSY-synchrotron to get
                      optimal proton beam conditions for the COSY-11 experiment.
                      Varying the focussing and defocussing strength of the
                      quadrupol in both of the arcs of the cooler ring the
                      dimensions of the proton beam was reduced to the size of the
                      Cluster target beam. The change of the optics from the
                      normal COSY one to this special COSY-11 optics combines a
                      hight resolution measurment due to the srnall size of the
                      reaction zone with a high luminosity - due to the maximized
                      overlapp of proton beam and target.},
      cin          = {PRE-2000},
      cid          = {I:(DE-Juel1)PRE2000-20140101},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29},
      url          = {https://juser.fz-juelich.de/record/864903},
}