Abstract
Current investigations at the internal fixed target experiment ANKE at the storage ring COSY, located at the Forschungszentrum Julich in Germany, focus on the behaviour of the η meson production process as well as on the study of angular distributions in the reactions d + p → 3 He+ η and p +d → d + η + p sp . The recent analysis status for both reactions will be presented and discussed.
Highlights
Investigations on the total cross sections of the reaction d + p → 3He + η are of special interest since they differ strongly from a pure phase space behaviour near threshold
Figure 1) show a distinct effect of s- and p-wave interference with the η momentum pη, which can be explained by a rapid variation of the 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 η3He-system [6]
New high precision data from the ANKE spectrometer enable the extraction of additional total and differential cross sections for the η production up to an excess energy of Q = 15 MeV with improved accuracy, which will clarify the behaviour of the asymmetry factor α with less uncertainties
Summary
Investigations on the total cross sections of the reaction d + p → 3He + η are of special interest since they differ strongly from a pure phase space behaviour near threshold (cf. Figure 1 (left)) [1,2,3,4,5].EPJ Web of Conferencesanalyses of the asymmetry factor α [6] of the differential cross sections (cf. Figure 1 (right)) show a distinct effect of s- and p-wave interference with the η momentum pη, which can be explained by a rapid variation of the phase. Current investigations at the internal fixed target experiment ANKE at the storage ring COSY, located at the Forschungszentrum Jülich in Germany, focus on the behaviour of the η meson production process as well as on the study of angular distributions in the reactions d + p → 3He + η and p + d → d + η + psp.
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