Polarized {sup 3}He(e,e'n) Asymmetries in Three Orthogonal Measurements

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Asymmetry measurements were conducted in Jefferson Lab's experimental Hall A through electron scattering from a polarized {sup 3}He target in the quasi-elastic polarized-{sup 3}He(e,e'n) reaction. Measurements were made with the target polarized in the longitudinal direction with respect to the incoming electrons A_L, in a transverse direction that was orthogonal to the beam-line and parallel to the q-vector A_T, and in a vertical direction that was orthogonal to both the beam-line and the q-vector (A_y^0). The experiment measured $A_y^0$ at four-momentum transfer squared Q^2 of 0.127 (GeV/c)^2, 0.456 (GeV/c)^2, and 0.953 (GeV/c)^2. The A_T and A_L asymmetries were both measured ... continued below

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Long, Elena September 1, 2012.

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Asymmetry measurements were conducted in Jefferson Lab's experimental Hall A through electron scattering from a polarized {sup 3}He target in the quasi-elastic polarized-{sup 3}He(e,e'n) reaction. Measurements were made with the target polarized in the longitudinal direction with respect to the incoming electrons A_L, in a transverse direction that was orthogonal to the beam-line and parallel to the q-vector A_T, and in a vertical direction that was orthogonal to both the beam-line and the q-vector (A_y^0). The experiment measured $A_y^0$ at four-momentum transfer squared Q^2 of 0.127 (GeV/c)^2, 0.456 (GeV/c)^2, and 0.953 (GeV/c)^2. The A_T and A_L asymmetries were both measured at Q^2 of 0.505 (GeV/c)^2 and 0.953 (GeV/c)^2. This is the first time that three orthogonal asymmetries have been measured simultaneously. Results from this experiment are compared with the plane wave impulse approximation (PWIA) and Faddeev calculations. These results provide important tests of models that use 3He as an effective neutron target and show that the PWIA holds above Q^2 of 0.953 (GeV/c)^2.

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  • Report No.: JLAB-PHY-12-1635
  • Report No.: DOE/OR/23177-2333
  • Report No.: arXiv:1209.2739
  • Grant Number: AC05-06OR23177
  • DOI: 10.2172/1052214 | External Link
  • Office of Scientific & Technical Information Report Number: 1052214
  • Archival Resource Key: ark:/67531/metadc839477

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  • September 1, 2012

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  • May 19, 2016, 9:45 a.m.

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  • June 3, 2016, 3:04 p.m.

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Long, Elena. Polarized {sup 3}He(e,e'n) Asymmetries in Three Orthogonal Measurements, thesis or dissertation, September 1, 2012; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc839477/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.