Experimental Investigation of the Reaction exp 12 C( gamma , pi exp 0 )X in the Photon Energy Range Between Threshold and 450 MeV

摘要

The photoproduction of neutral pions on exp 12 C has been investigated between threshold and 450 MeV photon energy using the tagged photon beam at the Bonn 500 MeV synchrotron and a large acceptance detector. The pi exp 0 detector consists of cylindrical wire chambers covering a solid angle of nearly 4 pi . Using a scintillation counter as an active exp 12 C target an attempt was made to separate coherent and incoherent pi exp 0 photoproduction. The measured total and differential cross sections are compared to corresponding theoretical calculations. (ERA citation 08:042698)