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I calculate the parity violating asymmetry A_{pv} for elastic electronscattering from 27Al in order to compare with the Qweak experiment "background"27Al measurement. I find that Coulomb distortions, and the quadrupole formfactor, reduce A_{pv} near the diffraction minimum. The Qweak data can be usedto confirm the neutron radius of 27Al, if nuclear structure uncertainties areindeed small, as I suggest, and one can estimate inelastic and impuritycontributions. This could provide an important check of the measurement,analysis, and theory.

Parity violating elastic electron scattering from 27Al and the Qweak measurement