Schwellennahe Hyperonproduktion in den Reaktionskanälen pp $\rightarrow$ pK$^{+}\Lambda$ und pp ${\rightarrow} pK^{+}\Sigma^{0}$ am Experiment COSY-11
Schwellennahe Hyperonproduktion in den Reaktionskanälen pp $\rightarrow$ pK$^{+}\Lambda$ und pp ${\rightarrow} pK^{+}\Sigma^{0}$ am Experiment COSY-11
At the infernal experiment COSY-11 the near threshold production of the two neutral hyperons $\Lambda$ and $\Sigma^{0}$ has been investigated in proton-proton collisions. In the measured energy region of up to 13 MeV excess energy it was found that the cross section of the $\Lambda$-production excel...
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Personal Name(s): | Sewerin, S. H. (Corresponding author) |
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Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
2000
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Physical Description: |
II, 83 p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte des Forschungszentrums Jülich
3733 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
At the infernal experiment COSY-11 the near threshold production of the two neutral hyperons $\Lambda$ and $\Sigma^{0}$ has been investigated in proton-proton collisions. In the measured energy region of up to 13 MeV excess energy it was found that the cross section of the $\Lambda$-production excels that of the $\Sigma^{0}$-production by a factor of 28. This ratio of the cross sections is in contrast to measurements at higher excess energies, where a ratio of 2-3 has been determined. As one explanation of this result a N$\Sigma \rightarrow$ N$\Lambda$-conversion is discussed, which is known in the literature as the so called cusp-effect. At near threshold measurements of the $\Sigma^{0}$-production simultanously the lighter $\Lambda$-particle is produced. These reactions at about 80 MeV excess energies were also analysed and compared to other measurements at simlilar excess energy. |