Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Hadronenstruktur und -spektroskopie
HK 18.2: Vortrag
Dienstag, 18. März 2014, 14:30–14:45, HZ 3
Testing for spin dependence in the final state interaction of the reaction d→p → 3 He η — •Michael Papenbrock1, Alfons Khoukaz1, Christopher Fritzsch1, Paul Goslawski1, Malte Mielke1, Daniel Schröer1, Alexander Täschner1, and Colin Wilkin2 for the ANKE collaboration — 1Institut für Kernphysik, Westfälische Wilhelms-Universität, 48149 Münster, Germany — 2Physics and Astronomy Department, UCL, London WC1E 6BT, UK
The dp → 3He η reaction is known for the unexpected energy dependence of its total cross section, which rises rapidly to its plateau value within the first 1 MeV of excess energy Q. This behaviour has been ascribed to a strong final state interaction and may indicate a quasi-bound η 3He state. In order to investigate the possibility of spin-dependent contributions to the total cross section, the deuteron tensor analysing power t20 has been measured in an excess energy range from Q = 0 MeV up to above Q = 10 MeV at the COSY-ANKE spectrometer. This allows one to compare the magnitudes of the contributions from the two spin configurations in the entrance channel with the strong variation seen in the average production amplitude. Furthermore, a weak angular dependence of t20 was also extracted and this provides insight into the structure of the production amplitude close to threshold.
Final results will be presented and discussed.
Supported by the COSY FFE programme.