The single photon method

For any other species of neutrino the diagrams of type (o) are absent. 

The formula for the cross-section is rather complicated and can be found in Berends et oL (1988b). We note simply that the amplitudes for a given neutrino species j, i.e. production of a given ujpj pair is of the form  

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FAD allows to study rather precisely and unambiguously the OACF of polymer chains. Thanks to the unique statistical nature of the single photon method, and to the performances of the synchrotron source, it has proved very useful in the discussion of the nature of motions. For instance, it led to the first observation of the diffusion of orientational motions along the chains in polymer melts. Of course, the labeling nature of this kind of experiments implies two limitations. The first one, technical, is the necessity of labeling chains. Indeed, many different polymers can be labelled and several species have been or are studied in our laboratory (Polystyrene polybutadienes -20.37) polyisoprenes poly-... 

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