Spin Structure Functions of the Deuteron Measured with CLAS in and Above the Resonance Region

<p>Spin structure functions of the nucleon in the region of large <em>x</em> and small to moderate <em>Q</em>² continue to be of high current interest. The first moment of the spin structure function <em>g</em>₁, Γ₁, goes through a rapid transition from the photon point (<em>Q</em>² = 0), where it is constrained by the Gerasimov-Drell-Hearn sum rule, to the deep inelastic limit where it is sensitive to the nucleon spin fraction carried by quarks. The interesting behavior in the transition region is dominated by baryon resonance excitations. We concluded an experiment to measure these observables for deuterium as part of the “EG1” run group in Jefferson Lab's Hall B. We used a highly polarized electron beam with energies from 1.6 GeV to 5.7 GeV and a cryogenic polarized ND₃ target together with the CEBAF Large Acceptance Spectrometer (CLAS) to accumulate over 11 billion events. In this thesis, we present results for the spin structure function [special characters omitted](<em>x, Q</em>²), as well as its first moment, [special characters omitted](<em>Q</em>²) in and above the resonance region over a <em>Q</em>² range from 0.05 to 5 GeV², based on the data taken with beam energies of 1.6 and 5.7 GeV. We also extract the behavior of [special characters omitted](<em>x</em>) at large <em>x</em>. Our data are consistent with the Hyperfine-perturbed quark model calculation which predicts that [special characters omitted](<em>x</em> → 1) → 1. We also see evidence for duality in [special characters omitted](<em>x, Q</em>²) at <em>Q</em>²> 1.5 GeV².</p>

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date.available

2004

Author dc:creator

• Dharmawardane, Kahanawita G. Vipuli G.

Contributors dc:contributor

• Gail Dodge
• John Donat
• Sebastian Kuhn
• Anatoly Radyushkin
• Charles I. Sukenik

• Deuteron
• Nucleon
• Resonance
• Spin structure functions
• Nuclear

Statement dc:rights

• <p>In Copyright. URI: <a href="http://rightsstatements.org/vocab/InC/1.0/">http://rightsstatements.org/vocab/InC/1.0/</a> This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).</p>

Repository record dc:identifier

https://digitalcommons.odu.edu/physics_etds/31

OAI identifier oai:identifier

oai:digitalcommons.odu.edu:physics_etds-1036