ANALYZING POWER FOR PI-P CHARGE-EXCHANGE IN THE BACKWARD HEMISPHERE FROM 301 TO 625 MEV/C AND A TEST OF PI-N PARTIAL-WAVE ANALYSES

The analyzing power of -p0n has been measured for p=301-625 MeV/c with a transversely polarized target, mainly in the backward hemisphere. The final-state neutron and a from the 0 were detected in coincidence with two counter arrays. Our results are compared with predictions of recent N partial-wave analyses by the groups of Karlsruhe-Helsinki, Carnegie-Mellon University-Lawrence Berkeley Laboratory (CMU-LBL), and Virginia Polytechnic Institute (VPI). At the lower incident energies little difference is seen among the three analyses, and there is excellent agreement with our data. At 547 MeV/c and above, our data strongly favor the VPI phases, and disagree with Karlsruhe-Helsinki and CMU-LBL analyses, which are the source of the N resonance parameters given in the Particle Data Group table. © 1990 The American Physical Society.