This title appears in the Scientific Report :
2013
Please use the identifier:
http://hdl.handle.net/2128/5396 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevC.87.035204 in citations.
Search for η-mesic ^{4}He with the WASA-at-COSY detector
Search for η-mesic ^{4}He with the WASA-at-COSY detector
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...
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Please use the identifier: http://dx.doi.org/10.1103/PhysRevC.87.035204 in citations.
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. An exclusive measurement of the excitation function for the dd→3Hepπ− reaction was performed at the Cooler Synchrotron COSY-Jülich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 to 2.400 GeV/c crossing the kinematic threshold for the η-meson production in the dd→4Heη reaction at 2.336 GeV/c. The corresponding excess energy with respect to the 4He-η system varied from −51.4 to 22 MeV. The integrated luminosity in the experiment was determined using the dd→3Hen reaction. The shape of the excitation function for the dd→3Hepπ− reaction was examined. No signal of the 4He-η bound state was observed. An upper limit for the cross section for the bound state formation and decay in the process dd→(4He-η)bound→3Hepπ− was determined on the 90% confidence level and it varies from 20 to 27 nb for the bound state width ranging from 5 to 35 MeV, respectively. |