Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 55: Hadron Structure and Spectroscopy IX
HK 55.3: Vortrag
Freitag, 2. März 2018, 14:45–15:00, HZO 50
The 3Heη final state in dp fusion 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 observation of 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 on high precision data of 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 with significantly improved accuracy 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".