In an experiment of a radioactive ion beam, which aims at discovering exotic unstable nuclei, a corresponding target-out experiment ( i.e. do the same without target ) is usually proposed. With the help of this procedure, one can define zero-degree line more precisely, and get the angular resolution of the detecting systerm. However, if there is no target-out experiment, the zero-line and the angular resolution will not be so good. So, is there any technique could be used to deal with this case: how to analysis a quasi-elastic scattering of unstable nuclei on light target well without target-out experiment?
Thanks a lot!