The Acceleration of Polarized Protons to 22-{GeV}/$c$ and the Measurement of Spin Spin Effects in $p$ (Polarized) + $p$ (Polarized) $\to p + p$ - INSPIRE

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The Acceleration of Polarized Protons to 22-{GeV}/ $c$ and the Measurement of Spin Spin Effects in $p$ (Polarized) + $p$ (Polarized) $\to p + p$

Apr, 1988

162 pages

Published in:

Phys.Rev.D 39 (1989) 45

DOI:

10.1103/PhysRevD.39.45

Report number:

UM-HE-87-36

Experiments:

BNL-E-0782

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Abstract: (APS)

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 Ann in large- P⊥2 proton-proton elastic scattering, using the polarized proton beam and a polarized proton target. We also obtained a high-precision measurement of A at P⊥2=0.3 (GeV/c)2 at 13.3 GeV/c. At 18.5 GeV/c we found that Ann=(-2±16)% at P⊥2=4.7 (GeV/c)2, 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 P⊥2.

P P: ELASTIC SCATTERING
ELASTIC SCATTERING: P P
SCATTERING: WIDE-ANGLE
WIDE-ANGLE: SCATTERING
P: POLARIZED BEAM
POLARIZED BEAM: P
P: POLARIZED TARGET
POLARIZED TARGET: P
RESONANCE: DEPOLARIZATION
DEPOLARIZATION: RESONANCE

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