Measuring the Neutron and 3He Spin Structure at Low Q2

Conference · Mon Oct 01 04:00:00 EDT 2007

OSTI ID:1967332

Sulkosky, Vincent ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

The study of the nucleon spin structure has been an active field for the past few decades. The ultimate goal is to understand the structure and interactions of protons and neutrons in terms of quarks and gluons. The Gerasimov-Drell-Hearn (GDH) sum rule is an important tool available to study nucleon spin structure. Originally derived for real photon absorption, the sum rule was first extended to non-zero Q2 in 1989. The extension of the sum rule provides a Q2-dependent relation that can be used to study the nucleon spin structure and make comparisons between theoretical predictions and the experimental data. Jefferson Lab experiment E97-110 performed a precise measurement of the Q2 dependence of the extended GDH integral and of other moments of the neutron and 3He spin scructure functions between 0.02 and 0.3 GeV2. These data allow us to test chiral perturbation theory calculations and check the GDH sum rule by extrapolating to the real photon point. The data were taken in Hall A using the Jefferson Lab highly polarized continuous electron beam and a polarized 3He target. The experimental details will be discussed, and preliminary results will be presented.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1967332
• Report Number(s): JLAB-PHY-07-972; DOE/OR/23177-5926
• Country of Publication: United States
• Language: English