Abstract
Accelerating polarized protons to 22 GeV/c at the Brookhaven Alternating Gradient Synchro- tron required both extensive hardware modifications and a difficult commissioning process. We had to overcome 45 strong depolarizing resonances to maintain polarization up to 22 GeV/c in this strong-focusing synchrotron. At 18.5 GeV/c we measured the analyzing power A and the spin-spin correlation parameter in large- proton-proton elastic scattering, using the polarized proton beam and a polarized proton target. We also obtained a high-precision measurement of A at =0.3 (GeV/c at 13.3 GeV/c. At 18.5 GeV/c we found that =(-2±16)% at =4.7 (GeV/c, where it was about 60% near 12 GeV at the Argonne Zero Gradient Synchrotron. This sharp change suggests that spin-spin forces may have a strong and unexpected energy dependence at high .
- Received 11 May 1988
DOI:https://doi.org/10.1103/PhysRevD.39.45
©1989 American Physical Society