Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Hadron Structure and Spectroscopy XI
HK 64.6: Vortrag
Freitag, 18. März 2016, 15:30–15:45, S1/01 A5
Studies on the η meson production channel d+p → 3He+η — •Christopher Fritzsch, Alfons Khoukaz, Marcel Rump, 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, analysis of the asymmetry factor α of the differential cross sections show a distinct effect of s- and p-wave interference with the η momentum, 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, located at the Forschungszentrum Jülich in Germany, enable the extraction of additional total and differential cross sections for the η production up to an excess energy of Q = 15 MeV with significantly improved 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.