Search for η mesic 3He with the WASA-at-COSY facility in the pd -> 3He2γ and pd -> 3He6γ reaction
- Adlarson, Patrik
- Augustyniak, W.
- Bardan, W.
- Bashkanov, M.
- Bass, S. D.
- Berlowski, M.
- Bondar, A.
- Buescher, M.
- Calén, Hans
- Ciepal, I.
- Clement, H.
- Czerwinski, E.
- Engels, R.
- Erven, A.
- Erven, W.
- Eyrich, W.
- Fedorets, P.
- Foehl, K.
- Fransson, Kjell
- Goldenbaum, F.
- Goswami, A.
- Grigoryev, K.
- Heijkenskjöld, Lena
- Hejny, V.
- Hirenzaki, S.
- Jarczyk, L.
- Johansson, Tord
- Kamys, B.
- Kelkar, N. G.
- Kemmerling, G.
- Khreptak, A.
- Kirillov, D. A.
- Kistryn, S.
- Kleines, H.
- Klos, B.
- Krzemien, W.
- Kulessa, P.
- Kupsc, Andrzej
- Lalwani, K.
- Lersch, D.
- Lorentz, B.
- Magiera, A.
- Maier, R.
- Marciniewski, Pawel
- Marianski, B.
- Morsch, H. -P
- Moskal, P.
- Ohm, H.
- Parol, W.
- del Rio, E. Perez
- Piskunov, N. M.
- Prasuhn, D.
- Pszczel, Damian
- Pysz, K.
- Ritman, J.
- Roy, A.
- Rundel, O.
- Sawant, S.
- Schadmand, S.
- Schatti-Ozerianska, I.
- Sefzick, T.
- Serdyuk, V.
- Shwartz, B.
- Skorodko, T.
- Skurzok, M.
- Smyrski, J.
- Sopov, V.
- Stassen, R.
- Stepaniak, J.
- Stephan, E.
- Sterzenbach, G.
- Stockhorst, H.
- Stroeher, H.
- Szczurek, A.
- Trzcinski, A.
- Wolke, Magnus
- Wronska, A.
- Wuestner, P.
- Yamamoto, A.
- Zabierowski, J.
- Zielinski, M. J.
- Zlomanczuk, Jozef
- Zupranski, P.
- Zurek, M.
DOIAbstract
We report on the experimental search for the bound state of an eta meson and He-3 nucleus performed using the WASA-at-COSY detector setup. In order to search for the eta-mesic nucleus decay, the pd -> (3)He2(gamma) and pd -> (3)He6 gamma channels have been analysed. These reactions manifest the direct decay of the ti meson bound in a He-3 nucleus. This non-mesonic decay channel has been considered for the first time. When taking into account only statistical errors, the obtained excitation functions reveal a slight indication for a possible bound state signal corresponding to a He-3-eta nucleus width Gamma above 20 MeV and binding energy B-s between 0 and 15 MeV. However, the determined cross sections are consistent with zero in the r...
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