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Volume 346 - 23rd International Spin Physics Symposium (SPIN2018) - Parallel Session: Spin physics in Nuclear Reactions and Nuclei (F. Becattini and o. Hen)
Measurement of the Vector and Tensor Asymmetries at Large Missing Momentum in Quasielastic $(\vec e, e'p)$ Electron Scattering from Deuterium
R. Milner* for the BLAST Collaboration
*corresponding author
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Pre-published on: 2019 August 19
Published on: 2019 August 23
We report the measurement of the beam-vector and tensor asymmetries $A{_{ed}^V}$ and $A{_d^T}$ in quasielastic $(\vec e, e'p)$ electrodisintegration of the deuteron at the MIT-Bates Linear Accelerator Center up to missing momentum of 500 MeV/c. Data were collected simultaneously over a momentum transfer range 0.1 < Q$^2$ < 0.5 (GeV/c)$^2$ with the Bates Large Acceptance Spectrometer Toroid using an internal deuterium gas target, polarized sequentially in both vector and tensor states. The data are compared with calculations. The beam-vector asymmetry $A{_{ed}^V}$ is found to be directly sensitive to the D-wave component of the deuteron and have a zero-crossing at a missing momentum of about 320 MeV/c, as predicted. The tensor asymmetry $A{_d^T}$ at large missing momentum is found to be dominated by the influence of the tensor force in the neutron-proton final-state interaction. The new data provide a strong constraint on theoretical models.
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