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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Hadron Structure and Spectroscopy VI

HK 46.5: Vortrag

Donnerstag, 30. März 2017, 18:15–18:30, F 5

High precision studies on angular asymmetries of the differential cross sections in the d+p → ³He+η reaction — •Christopher Fritzsch, Alfons Khoukaz, and Daniel Schröer for the ANKE-Collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Deutschland

Investigations on the 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. Furthermore, analyses of the asymmetry factor α of the differential cross sections show a distinct effect of s- and p-wave interference, which can be explained by a rapid variation of the relative phase. These effects are an indication for an unexpected strong final state interaction (FSI) between η mesons and ³He nuclei which could lead to a quasi bound state of the ³Heη-system. Current investigations on high precision data at the internal fixed target experiment ANKE of the storage ring COSY enable the extraction of additional total and differential cross sections for the η production up to an excess energy of Q = 15 MeV. These cross sections will significantly improve the accuracy, which will allow to study the behavior of the asymmetry factor α with high resolution. Recent results will be presented and discussed.

*This work has been supported by the COSY-FFE program of the Forschungszentrum Jülich and the Deutsche Forschungsgemeinschaft (DFG) through the Research Training Group "GRK 2149: Strong and Weak Interactions - from Hadrons to Dark Matter".