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Measurements of the Proton and Deuteron Spin Structure Function<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">g</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and Asymmetry<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">A</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></…
We have measured proton and deuteron virtual photon-nucleon asymmetries ${A}_{2}^{p}$ and ${A}_{2}^{d}$ and structure functions ${g}_{2}^{p}$ and ${g}_{2}^{d}$ over the range $0.03<x<0.8$ and $1.3<{Q}^{2}<10(\mathrm{GeV}/c{)}^{2}$ by inelastically scattering polarized electrons off polarized ammonia targets. Results for ${A}_{2}$ are significantly smaller than the positivity limit $\sqrt{R}$ for both targets. Within experimental precision …