Results From The RHIC PC CNI Polarimeter for 2003

Technical Report · Wed Sep 01 04:00:00 EDT 2004

DOI:https://doi.org/10.2172/1061763· OSTI ID:1061763

Jinnouchi, O. ^[1]

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1. Brookhaven National Laboratory (BNL), Upton, NY (United States). RIKEN Research Center; et al.

The RHIC proton-carbon CNI polarimeters use pC elastic scattering in the coulomb-nuclear interference region to measure the beam polarization. Sensitivity to polarization is due to the coulomb spin-flip amplitude that is also responsible for the proton anomalous magnetic moment. The interference term arising from this amplitude, electromagnetic spinflip x hadronic spin nonflip, is calculable, but an additional interference term, from a hadronic spin flip amplitude x electromagnetic spin nonflip, is not. The polarimeter analyzing power A_N was determined at 22 GeV by measuring the beam polarization in an external beam at the AGS, experiment E925, while simultaneously measuring the CNI asymmetry in the AGS ring, experiment E950. E925 used proton-proton elastic scattering in a larger t region (-t = 0.15 (GeV/c)²), where the analyzing power was known (and non-zero), from polarized target experiments. A_N for pC CNI was determined to ±30% at 22 GeV. The analyzing power for RHIC at 100 GeV will be determined for the first time using a new polarized atomic hydrogen gas jet target in RHIC, over the next two years (2004-5).

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1061763
• Report Number(s): BNL--99322-2013-IR; C-A/AP/#171; KB0202011
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
relativistic heavy ion collider