Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Hadronenstruktur und -spektroskopie
HK 2.4: Vortrag
Montag, 19. März 2012, 15:00–15:15, RW 2
Excitation of the Δ(1232) isobar in deuteron charge exchange on hydrogen at 1.6, 1.8 and 2.3 GeV — •David Mchedlishvili — Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
Deuteron charge-exchange break-up d→p → {pp}n, where the final {pp} diproton system is at very low excitation energy and hence in the 1S0 state, is a powerful tool to probe the spin-flip terms in the proton-neutron charge-exchange reaction. Recent measurements with the ANKE spectrometer at the COSY storage ring at 1.6, 1.8, and 2.3 GeV have extended this study into the pion-production regime in order to investigate the excitation of the Δ(1232) isobar in the dp → {pp}Δ0 reaction. Values of the differential cross section and two deuteron tensor analysing powers, Axx and Ayy, have been extracted in terms of the diproton production angle or Δ0 invariant mass. These data can be interpreted in impulse approximation in terms of the spin-longitudinal or spin-transverse contributions to the elementary n→p → p→ Δ0 process. However, the existence of the another contributory mechanism at low mass region will also be demonstrated. The presented results will be compared to those obtained with the SPES-4 spectrometer at Saclay at 2 GeV.
Supported by the COSY-FFE program.