Mainz 2012 – wissenschaftliches Programm
HK 30.5: Vortrag
Mittwoch, 21. März 2012, 17:45–18:00, RW 1(contribution withdrawn)
Search for the 4He−η bound state with WASA-at-COSY — •Wojciech Krzemien1, Pawel Moskal1,2, Jerzy Smyrski1, and Magdalena Skurzok1 — 1Jagiellonian University, Krakow, Poland — 2Institut für Kernphysik, and Jülich Center for Hadron Physics, Forschungszentrum
We conduct a search for the 4He−η bound state with WASA-at-COSY facility, via a measurement of the excitation functions for the dd → 3He p π reaction, where the outgoing p−π pairs originate from the conversion of the η meson on a nucleon inside the He nucleus.
In June, 2008 first measurements of the excitation functions for the dd → 3Hepπ reaction were performed. In the experiment we used a slowly ramped COSY deutron beam, scanning the range of momenta corresponding to the variation of the excess energy for the 4He−η system from - 51 MeV to 22 MeV.The results from the analysis will be presented.
This work has been supported by FFE funds of Forschungszetrum Juelich, grant No 41831803 (COSY-107), by the European Commission under the 7th Framework Programme through the ’Research Infrastructures’ action of the ’Capacities’ Programme. Call: FP7-INFRASTRUCTURES-2008-1, Grant Agreement N. 227431 and by the Polish Ministry of Science and Higher Education under grants No. 2367/B/H03/2009/37 and 0320/B/H03/2011/40.