Abstract

The BLAST (Bates Large Acceptance Spectrometer Toroid) experiment has been carried out at the MIT‐Bates Linear Accelerator Center to study spin‐dependent electron scattering from protons and deuterons with small systematic uncertainties. The experiment used a longitudinally polarized, intense electron beam stored in the Bates South Hall Ring in combination with isotopically pure, highly‐polarized internal targets of polarized hydrogen and vector‐ and tensor‐polarized deuterium from an atomic beam source. The BLAST data have been used to extract precise results for the elastic form factor ratios GE/GM of the proton and the neutron at low momentum transfer.

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