Electron Scattering from Tensor-Polarized Deuterons in the VEPP-3 Electron Storage Ring

Abstract

ELASTIC SCATTERINGWithin the plane wave impulse approximation, the differential cross section for unpolarized elastic electron-deuteron scattering may be written in the familiar Rosenbluth form:in which a m is the Mott cross section, and A and B are given in terms of the deuteron charge (G c ), quadrupole (G g ) and magnetic (G m ) form factors:with Q 2 the square of the 4-momentum transfer and T -Q 2 /4m^2. Thus, a Rosenbluth separation may be used to extract A and B (and hence G m ) from scattering data, but G c and G q may not be separated. To isolate these form factors requires the use of polarization techniques. Following the Madison convention 1 , the scattering of unpolarized electrons from a tensor polarized deuteron is described by the cross section 2 =<7 0 [l + T 2 oi20 + 2r 2 iRe(f2i) + 2r22Re(*22)]in which the T2i and £21 are respectively the components of the analyzing power and polarization tensors, in a spherical basis. For moderate momentum transfers and suitably chosen polarization directions, the terms involving T21 and T22 are small, and may be ignored for the moment. The tensor analyzing power T20 is given by: >,