Author/Authors :
K. Kirsebom، نويسنده , , Yu.V Kononets، نويسنده , , U Mikkelsen، نويسنده , , S.P M?ller، نويسنده , , E Uggerh?j، نويسنده , , T Worm، نويسنده , , K Elsener، نويسنده , , C Biino، نويسنده , , S Ballestrero، نويسنده , , P Sona، نويسنده , , R.O Avakian، نويسنده , , K.A Ispirian، نويسنده , , S.P Taroian، نويسنده , , S.H. Connell، نويسنده , , J.P.F. Sellschop، نويسنده , , Z.Z Vilakazi، نويسنده ,
Abstract :
Presented are experimental results for the difference in pair production probability (the asymmetry) for 5–150 GeV photons polarized parallel and perpendicular to a (110) plane in a 1.5 mm thick diamond 〈100〉 crystal. The photons are produced by interaction of 150 GeV electrons with an aligned diamond 〈100〉 crystal of 0.5 mm thickness. A significant asymmetry is found over the whole energy range, which corresponds to a high degree of linear polarization of the photons as well as a difference in the refractive index. This proof-of-principle result gives the possibility of producing high energy photons with circular polarization by use of a crystal. This might open for several opportunities in high energy physics like for instance the investigation of the contribution of the gluons to the spin of the nucleon.
