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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Elektromagnetische und Hadronische Sonden

HK 23.7: Talk

Tuesday, March 11, 2008, 12:45–13:00, 1C

np-Amplitude Studies at ANKE — •David Chiladze for the ANKE collaboration — Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany

A key feature of the ongoing and planned experiments at ANKE spectrometer is the use of polarized beams and targets which allow one to perform double–polarization measurements with the hadronic probes. The proton–neutron programme has already been started at ANKE by using polarized deuterons on an unpolarized target to study the d^→p^→→ (pp)n deuteron charge–exchange reaction and the full programme with a polarized storage cell target will be conducted in the beginning of 2008.

At low excitation energies of the final pp system, the spin observables are directly related to the spin–dependent parts of the neutron–proton charge–exchange amplitudes. Our measurement of the deuteron–proton spin correlations will allow us to determine the relative phases of these amplitudes in addition to their overall magnitudes. Such data are of importance for the phase shift analysis of the np system where data are scarce.

This contribution will present recent results of the np-amplitude studies from the ANKE facility using the polarized deuteron COSY beam.

Supported by the COSY-FFE program