Speaker
Description
It is experimentally and theoretically challenging to determine the ex-
act number of exited nucleon states and their properties, since the short
lifetime of these exited states leads to strongly overlapping resonances.
Using a polarized beam, a polarized target or using the polarization
of the recoil nucleon helps to measure single or double polarization
observables, that are needed for an unambiguous partial wave analysis
solution.
The CBELSA/TAPS experiment in Bonn provides a polarized pho-
ton beam as well as a longitudinally or transversely polarized target,
allowing for the determination of single and double polarization ob-
servables. The Crystal Barrel (CB) calorimeter, together with the
MiniTAPS calorimeter in forward direction, give the opportunity for
close to 4$\pi$ coverage for the measurements.
This talk will present preliminary results of the determination of
the polarization observables T, P and H, for energies between 600MeV
and 3200MeV, using data collected after the recent upgrade of the
CB calorimeters readout electronics and these results are compared to
previous data and model predictions
