A Measurement of the Deuteron Magnetic Dipole Form Factor from Vector Polarization Observables

A measurement of the vector analyzing powers $T^{e}_{10}$ and $T^{e}_{11}$ and the magnetic dipole form factor $G_{M}$ in elastic electron-deuteron scattering has been conducted at the MIT-Bates Linear Accelerator Facility using a polarized electron beam, an internal polarized atomic deuterium target, and the symmetric BLAST(Bates Large Acceptance Spectormeter Toroid) detector in the Bates South Hall Ring. The beam helicity dependent target vector asymmetries, simultaneously measured in both sectors of BLAST, allow the extraction of $T^{e}_{10}$ and $T^{e}_{11}$. To our knowledge this is the first such use of a polarized target in measuring these observables. At low $Q^{2}$, the statistically more significant observable $T^{e}_{11}$ is dominated by the interference of $G_{M}$ and the charge monopole form factor $G_{C}$. The high accuracy to which $G_{C}$ is known in this region allows for the extraction of $G_{M}$ yielding the first such measurement of this kind from spin observables. Preliminary results for $T^{e}_{10}$, $T^{e}_{11}$, and $G_{M}$ will be presented. This work supported by DOE grants 181021 (UNH) and DEFC02-94ER40818 (MIT-Bates).