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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Hadron Structure and Spectroscopy IV
HK 25.7: Vortrag
Dienstag, 19. März 2019, 18:15–18:30, HS 13
Studies on deuteron-proton collisions at the magnetic spectrometer ANKE — •Christopher Fritzsch and Alfons Khoukaz for the ANKE Collaboration — Westfälische Wilhelms-Universität, Münster, Germany
Total and differential cross sections of the reaction d+p → 3He+η are of special interest since they differ strongly from a pure phase space behavior near threshold. The asymmetry factor α of the differential cross sections show a distinct effect of an s- and p-wave interference, caused by a rapid variation of the relative phase. These observations are an indication for an unexpected strong final state interaction between the 3He nuclei and the η mesons which could lead to a quasi bound state of the 3Heη system. Current investigations using high precision data of the internal fixed target experiment ANKE of the storage ring COSY allow the extraction of total and differential cross sections for the η production up to an excess energy of Q = 15 MeV. Additionally, new differential cross sections of the reaction d+p → 3He+π0 were determined for the forward hemisphere, covering a range where no differential cross sections are available so far. Both the η meson and π0 production were normalized absolutely by using the dp elastic scattering. Here, also new differential cross sections of high precision were determined to enrich the existing data base. Recent results will be presented and discussed.
*This work has been supported by the COSY-FFE program of the FZJ and the DFG through the Research Training Group "GRK 2149: Strong and Weak Interactions - from Hadrons to Dark Matter".