Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering off $^{28}$Si and $^{90}$Zr
nucl-ex
/ Authors
A. Esser, M. Thiel, P. Achenbach, K. Aulenbacher, S. Aulenbacher, S. Baunack, D. Bosnar, S. Caiazza, M. Christmann, M. Dehn
and 23 more authors
M. O. Distler, L. Doria, P. Eckert, M. Gorchtein, P. Guelker, P. Herrmann, M. Hoek, S. Kegel, P. Klag, H. -J. Kreidel, M. Littich, S. Lunkenheimer, F. E. Maas, M. Makek, H. Merkel, M. Mihovilovivc, J. Mueller, U. Mueller, J. Pochodzalla, B. S. Schlimme, R. Spreckels, V. Tioukine, C. Sfienti
/ Abstract
We report on a new measurement of the beam-normal single spin asymmetry $A_{\mathrm{n}}$ in the elastic scattering of 570 MeV transversely polarized electrons off $^{28}$Si and $^{90}$Zr at $Q^{2}=0.04\, \mathrm{GeV}^2/c^2$. The studied kinematics allow for a comprehensive comparison with former results on $^{12}$C. No significant mass dependence of the beam-normal single spin asymmetry is observed in the mass regime from $^{12}$C to $^{90}$Zr.