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Measurement of the neutron (^3He) spin structure function at low Q^2 : a connection between the Bjorken and Drell-Hearn-Gerasimov sum rules

Citation

Jensen, John Steffen (2001) Measurement of the neutron (^3He) spin structure function at low Q^2 : a connection between the Bjorken and Drell-Hearn-Gerasimov sum rules. Dissertation (Ph.D.), California Institute of Technology. https://resolver.caltech.edu/CaltechTHESIS:07142014-135205986

Abstract

The spin dependent cross sections, σT1/2 and σT3/2 , and asymmetries, A and A for 3He have been measured at the Jefferson Lab's Hall A facility. The inclusive scattering process 3He(e,e)X was performed for initial beam energies ranging from 0.86 to 5.1 GeV, at a scattering angle of 15.5°. Data includes measurements from the quasielastic peak, resonance region, and the deep inelastic regime. An approximation for the extended Gerasimov-Drell-Hearn integral is presented at a 4-momentum transfer Q2 of 0.2-1.0 GeV2.

Also presented are results on the performance of the polarized 3He target. Polarization of 3He was achieved by the process of spin-exchange collisions with optically pumped rubidium vapor. The 3He polarization was monitored using the NMR technique of adiabatic fast passage (AFP). The average target polarization was approximately 35% and was determined to have a systematic uncertainty of roughly ±4% relative.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Hughes, Emlyn Willard
Thesis Committee:
  • Unknown, Unknown
Defense Date:28 August 2000
Record Number:CaltechTHESIS:07142014-135205986
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:07142014-135205986
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8538
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:14 Jul 2014 21:11
Last Modified:02 Dec 2020 02:49

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