Beam Asymmetry of Coherent <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">π</mi></math>° Photoproduction on <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>4</mn></mrow></msup></mrow><mi>He</mi></math> in the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">Δ</mi></math>(1232) Range Measured using Coherent Bremsstrahlung

A. Kraus; O. Selke; F. Rambo; G. Galler; M. Schumacher; F. Smend; R. Wichmann; F. Wissmann; S. Wolf; J. Ahrens; H. –J. Arends; R. Beck; J. Peise

doi:10.1103/PhysRevLett.79.3834

Beam Asymmetry of Coherent $π$ ° Photoproduction on $^{4} He$ in the $Δ$ (1232) Range Measured using Coherent Bremsstrahlung

A. Kraus, O. Selke, F. Rambo, G. Galler, M. Schumacher, F. Smend, R. Wichmann, F. Wissmann, S. Wolf, J. Ahrens, H. –J. Arends, R. Beck, and J. Peise

Phys. Rev. Lett. 79, 3834 – Published 17 November 1997

Abstract

Using coherent bremsstrahlung at MAMI (Mainz), the beam asymmetry of the differential cross sections for coherent $π °$ photoproduction on $^{4} He$ has been measured in the energy interval from 200 to 500 MeV at an angle of $θ_{lab} = 37 °$ . The coherent ( $γ, π °$ ) reaction is used as a precise linear polarimeter for the first time. Agreement with predictions has been obtained on a $≳ 3 %$ level of precision.