Final state effects in the neutron Compton scattering on hydrogen molecules-a new approach

In an alternative treatment of the so-called final state (FSE) effects the concept of scattering time is analyzed and the elastic slowing-down of the recoiling protons during this time is explicitly calculated and compared, first with those expected from standard FSE calculations and then with experimental data for one specifically chosen, well-studied system, the D2 molecule. The results of the present FSE calculations differ from the standard ones in the high energy tail of the Compton peak, but agrees very well with experiment. Taking into account the line shape differences discussed here should also be of importance for the closer analysis of proton momentum distributions as well as for the interpretation of the H- and D- intensity anomalies.