Conference paper

JLab experiment 01-006: resonances' spin structure

Oscar A. Rondon ; Institute of Nuclear and Particle Physics - University of Virginia, Charlottesville, VA 22901, U.S.A.

Abstract

Experiment 01-0061 (Resonances’ Spin Structure) was carried out at Jefferson Lab’s Hall C to measure the nucleon spin structure functions in the region of the nucleon resonances. Longitudinally polarized electrons of 5.76 GeV beam energy were incident on solid polarized ammonia and deuterated ammonia (15NH3, 15N2H3) targets. The scattered electrons were detected in the High Momentum Spectrometer parked at a 13.15◦ angle relative to the beam. The polarized target field was used to align the nucleon spins parallel and perpendicular to the beam helicity to measure the corresponding asymmetries Ak and A⊥. The measured asymmetries are used to extract in a model-free way the nucleon spin asymmetries A1(W, Q2 ) and A2(W, Q2 ), which are functions of the invariant mass of the final system, W, and of the fourmomentum transfer, Q2 . The measurements extend over 0.8 GeV ≤ W ≤ 1.95 GeV and are at an average Q2 = 1.3 [GeV/c] 2 . Preliminary results are shown, including the world’s first set of data on the perpendicular asymmetry of the proton and the deuteron for this kinematic region.

Keywords

nucleon spin; nucleon resonances; polarized electron scattering

Hrčak ID:

305607

URI

https://hrcak.srce.hr/305607

Publication date:

1.3.2004.

Article data in other languages: croatian

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