  With the aim to study spin dependence of pion production near threshold, an
internal target facility and a forward detector have been installed in the
Cooler synchrotron ring at IUCF. The detector system comprises scintillators
and wire chambers. The target consists of a thin-walled open-ended storage cell
into which polarized atomic hydrogen is injected. Using a stored and cooled,
polarized proton beam, polarization observables of the reaction pp -> pp pi0
have been studied at energies between 21 and 55 MeV above the pion production
threshold in the center of mass system. We report here measurements of the spin
correlation parameters Axx and Ayy, and the analyzing power Ay, integrated over
the pion polar angle.
