Dependence of pp->pp pi0 near Threshold on the Spin of the Colliding   Nucleons
  A polarized internal atomic hydrogen target and a stored, polarized beam are used to measure the spin-dependent total cross section Delta_sigma_T/sigma_tot, as well as the polar integrals of the spin correlation coefficient combination A_xx-A_yy, and the analyzing power A_y for pp-> pp pi0 at four bombarding energies between 325 and 400 MeV. This experiment is made possible by the use of a cooled beam in a storage ring. The polarization observables are used to study the contribution from individual partial waves. 
H.O. Meyer, J.T. Balewski, M. Dzemidzic, J. Doskow, R.E. Pollock, B.   v. Przewoski, T. Rinckel, F. Sperisen, P. Th\"orngren...