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| Hauptseite > Institutssammlungen > IKP > IKP-4 > Annual report / Institut für Kernphysik / COSY 2006 |
| Hauptseite > Institutssammlungen > IKP > IKP-4 > Annual report / Institut für Kernphysik / COSY 2006 |
| Report | PreJuSER-135892 |
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2007
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/2636
Report No.: Juel-4234
Abstract: The past year 2006 has been a very successful one for the institute: first off, a major milestone has been achieved with the in-time installation of the WASA detector at an internal target station of COSY and its subsequent commissioning. WASA-at-COSY is ready to take data and the collaboration is looking forward to its first data production run, approved by the COSY-PAC and scheduled for spring 2007. Furthermore, after very productive scientific programs, the internal experiment COSY-11 and the external beam experiments at BIG KARL have finished their data taking phases, and are now completing the analysis of the existing data. The following highlights top the list of the important scientific results: • Pentaquark studies: the TOF-collaboration has very carefully analysed their dedicated high-statistics data sample, and did not find a signal for the $\circleddash^{+}$(1540). This finding has been supported by the ANKE-collaboration in a different final state. • Bound $\eta$-nucleus states: data with unprecedented precision for the $^{3}He\eta$ system have been obtained both at ANKE and at COSY-11 in the d p-reaction, exploiting the unique possibilities at the internal COSY beam during the ramp-up of the energy. The very rapid rise of the total cross section close to threshold implies a very large $^{3}He\eta$ scattering length and hence the presence of a quasi-bound state extremely close to threshold. • Hyperon-nucleon interactions: chiral effective field theory has successfully been applied to the interactions between nucleons and hyperons. This paves the way to a model-independent approach of strange quark effects in nuclei. • Accelerator studies: the COSY accelerator has been used for spin manipulations of a polarized deuteron beam, and clear indications for a deuteron spin resonance have been obtained. All results mentioned have recently been submitted for publication. More details and further results can be found in the main text. In addition to WASA, the two other major installations continue to be developed further: [...]
Keyword(s): nuclear physics
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