학술논문
Search for the eta-mesic 4He with WASA-at-COSY detector
Document Type
Working Paper
Author
Adlarson, P.; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bednarski, T.; Bergmann, F. S.; Berlowski, M.; Bhatt, H.; Buescher, M.; Calen, H.; Clement, H.; Coderre, D.; Czerwinski, E.; Demmich, K.; Doroshkevich, E.; Engels, R.; Erven, W.; Eyrich, W.; Fedorets, P.; Foehl, K.; Fransson, K.; Goldenbaum, F.; Goslawski, P.; Goswami, A.; Grigoryev, K.; Gullstroem, C. -O.; Hauenstein, F.; Heijkenskjoeld, L.; Hejny, V.; Hinterberger, F.; Hodana, M.; Hoeistad, B.; Jany, A.; Jany, B. R.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khan, F. A.; Khoukaz, A.; Kistryn, S.; Klaja, J.; Kleines, H.; Klos, B.; Krapp, M.; Krzemien, W.; Kulessa, P.; Kupsc, A.; Lalwani, K.; Lersch, D.; Li, L.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, P.; Marianski, B.; Mikirtychiants, M.; Morsch, H. -P.; Moskal, P.; Nandi, B. K.; Niedzwiecki, S.; Ohm, H.; Ozerianska, I.; del Rio, E. Perez; Plucinski, P.; Podkopal, P.; Prasuhn, D.; Pricking, A.; Pszczel, D.; Pysz, K.; Pyszniak, A.; Redmer, C. F.; Ritman, J.; Roy, A.; Rudy, Z.; Sawant, S.; Schadmand, S.; Schmidt, A.; Sefzick, T.; Serdyuk, V.; Shah, N.; Siemaszko, M.; Siudak, R.; Skorodko, T.; Skurzok, M.; Smyrski, J.; Sopov, V.; Stassen, R.; Stepaniak, J.; Stephan, E.; Sterzenbach, G.; Stockhorst, H.; Stroeher, H.; Szczurek, A.; Tolba, T.; Trzcinski, A.; Varma, R.; Vlasov, P.; Wagner, G. J.; Weglorz, W.; Wolke, M.; Wronska, A.; Wuestner, P.; Wurm, P.; Yamamoto, A.; Yuan, X.; Yurev, L.; Zabierowski, J.; Zheng, C.; Zielinski, M. J.; Zipper, W.; Zlomanczuk, J.; Zupranski, P.; Zurek, M.
Source
Physical Review C 87, 035204 (2013)
Subject
Language
Abstract
An exclusive measurement of the excitation function for the dd->3Heppi- reaction was performed at the Cooler Synchrotron COSY-Juelich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 GeV/c to 2.400 GeV/c crossing the kinematic threshold for the eta meson production in the dd->4He-eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the 4He-eta system varied from -51.4MeV to 22MeV. The integrated luminosity in the experiment was determined using the dd->3Hen reaction. The shape of the excitation function for the dd->3Heppi- was examined. No signal of the 4He-eta bound state was observed. An upper limit for the cross-section for the bound state formation and decay in the process dd->(4He-eta)bound->3Heppi- was determined on the 90% confidence level and it varies from 20nb to 27nb for the bound state width ranging from 5MeV to 35MeV, respectively.
Comment: 8 pages, 9 figures
Comment: 8 pages, 9 figures