Nuclear targets for a precision measurement of the neutral pion radiative width

摘要

A technique is presented for precision measurements of the area densities, ρT, of approximately 5% radiation length carbon and ~(208)Pb targets used in an experiment at Jefferson Laboratory to measure the neutral pion radiative width. The precision obtained in the area density for the carbon target is ± 0.050%, and that obtained for the lead target through an X-ray attenuation technique is ± 0.43%.