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Title: The Q{sup 2} evolution of the generalized Gerasimov-Drell-Hearn integral for the neutron using a {sup 3}He target

Abstract

The authors present data on the inclusive scattering of polarized electrons from a polarized {sup 3}He target at energies from 0.862 to 5.06 GeV, obtained at a scattering angle of 15.5{sup o}. The data include measurements from the quasielastic peak, through the resonance region, to the beginning of the deep inelastic regime, and were used to determine the virtual photon cross-section difference {sigma}{sub 1/2}-{sigma}{sub 3/2}. They extract the extended Gerasimov-Drell-Hearn integral for the neutron in the range of 4-momentum transfer squared Q{sup 2} of 0.1-0.9 (GeV){sup 2}. Sum rules involving the spin structure of the nucleon offer an important opportunity to study Quantum Chromodynamics (QCD). At long distance scales or in the confinement regime, a sum rule of great interest is that due to Gerasimov, Drell and Hearn (GDH). The GDH sum rule relates an integral over the full excitation spectrum of the spin-dependent total photoabsorption cross section to the nucleon's anomalous magnetic moment. It has not been investigated experimentally until recently, and further measurements are needed for a definitive test. At short distance scales or in the perturbative regime, two other sum rules, one due to Bjorken and the other derived by Ellis and Jaffe, have provided us withmore » significant information on nucleon spin structure through an extensive experimental and theoretical investigation. These sum rules make predictions involving the first moments of the spin structure functions measured in deep inelastic scattering (DIS).« less

Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
(US)
OSTI Identifier:
794400
Resource Type:
Journal Article
Resource Relation:
Other Information: No journal information given for this preprint; PBD: [2002]
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS SECTIONS; DEEP INELASTIC SCATTERING; MAGNETIC MOMENTS; NEUTRONS; QUANTUM CHROMODYNAMICS; STRUCTURE FUNCTIONS; SUM RULES; TARGETS

Citation Formats

. The Q{sup 2} evolution of the generalized Gerasimov-Drell-Hearn integral for the neutron using a {sup 3}He target. United States: N. p., 2002. Web.
. The Q{sup 2} evolution of the generalized Gerasimov-Drell-Hearn integral for the neutron using a {sup 3}He target. United States.
. Mon . "The Q{sup 2} evolution of the generalized Gerasimov-Drell-Hearn integral for the neutron using a {sup 3}He target". United States. https://www.osti.gov/servlets/purl/794400.
@article{osti_794400,
title = {The Q{sup 2} evolution of the generalized Gerasimov-Drell-Hearn integral for the neutron using a {sup 3}He target},
author = {},
abstractNote = {The authors present data on the inclusive scattering of polarized electrons from a polarized {sup 3}He target at energies from 0.862 to 5.06 GeV, obtained at a scattering angle of 15.5{sup o}. The data include measurements from the quasielastic peak, through the resonance region, to the beginning of the deep inelastic regime, and were used to determine the virtual photon cross-section difference {sigma}{sub 1/2}-{sigma}{sub 3/2}. They extract the extended Gerasimov-Drell-Hearn integral for the neutron in the range of 4-momentum transfer squared Q{sup 2} of 0.1-0.9 (GeV){sup 2}. Sum rules involving the spin structure of the nucleon offer an important opportunity to study Quantum Chromodynamics (QCD). At long distance scales or in the confinement regime, a sum rule of great interest is that due to Gerasimov, Drell and Hearn (GDH). The GDH sum rule relates an integral over the full excitation spectrum of the spin-dependent total photoabsorption cross section to the nucleon's anomalous magnetic moment. It has not been investigated experimentally until recently, and further measurements are needed for a definitive test. At short distance scales or in the perturbative regime, two other sum rules, one due to Bjorken and the other derived by Ellis and Jaffe, have provided us with significant information on nucleon spin structure through an extensive experimental and theoretical investigation. These sum rules make predictions involving the first moments of the spin structure functions measured in deep inelastic scattering (DIS).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {7}
}