Publications
Publication Information
| Title | Measurements of the Double-Spin Asymmetry A1 on Helium-3: Toward a Precise Measurement of the Neutron A1 |
| Authors | Diana Parno |
| JLAB number | JLAB-PHY-11-1565 |
| LANL number | (None) |
| Other number | DOE/ER/40150-4976 |
| Document Type(s) | (Thesis) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
|
Thesis A PHD thesis Advisor(s) : Gregg Franklin (CMU) | |
| Publication Abstract: | The spin structure of protons and neutrons has been an open question for nearly twenty- ve years, after surprising experimental results disproved the simple model in which valence quarks were responsible for nearly 100% of the nucleon spin. Diverse theoretical approaches have been brought to bear on the problem, but a shortage of precise data { especially on neutron spin structure { has prevented a thorough understanding. Experiment E06-014, conducted in Hall A of Je fferson Laboratory in 2009, presented an opportunity to add to the world data set for the neutron in the poorly covered valence-quark region. Je fferson Laboratory's highly polarized electron beam, combined with Hall A's facilities for a high-density, highly polarized 3He target, allowed a high-luminosity double-polarized experiment, while the large acceptance of the BigBite spectrometer gave coverage over a wide kinematic range: 0:15 < x < 0:95. In this work, we present the analysis of a portion of the E06-014 data, measured with an incident beam energy of 4.74 GeV and spanning 1:5 < Q2 < 5:5 (GeV/c)2. From these data, we extract the longitudinal asymmetry in virtual photon-nucleon scattering, A1, on the 3He nucleus. Combined with the remaining E06-014 data, this will form the basis of a measurement of the neutron asymmetry An1 that will extend the kinematic range of the data available to test models of spin-dependent parton distributions in the nucleon. |
| Experiment Numbers: | E99-117 |
| Group: | Hall A |
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