Barely Off-Shell Nucleon Structure

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

OSTI ID:1967356

Baillie, Nathan ^[1]

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1. College of William and Mary, Williamsburg, VA (United States)

The Barely Off-Shell Nucleon Structure (BoNuS) experiment measured electron scattering from neutrons bound in deuterium nuclei at Jefferson Lab?s Hall B with the intent of obtaining the ratio Fn2 / Fp 2 at high Bjorken x. The Fn2 structure function is difficult to obtain due to nature?s lack of a free neutron target. Previous experiments have measured inclusive quasi-elastic scattering in atomic nuclei, corrected for scattering from the protons in the nucleus, and relied upon models for the neutron binding and motion to obtain Fn2 . In BoNuS we restrict our analysis to neutron scattering events tagged by a backward-going low-energy recoil proton. This selects loosely bound neutrons that are nearly on their mass-shell and have few final-state interactions with the recoil proton. The recoil protons were detected in a Radial Time Projection Chamber (RTPC) using gas electron multipliers (GEMs) in a cylindrical geometry around the target. We will present the first preliminary results for Fn2 in the resonance and deep-inelastic regions

• 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: 1967356
• Report Number(s): JLAB-PHY-07-980; DOE/OR/23177-5938
• Country of Publication: United States
• Language: English