Probing the deuteron structure at small NN distances by subthreshold antiproton production

It is shown that subthreshold antiproton production in d - p and d - d collisions can provide new information about the deuteron structure at small internuclear distances. Detailed predictions for future experiments at KEK are made which indicate, that a signal of the non-nucleon component in the deuteron can be obtained from the differential p yield and in an almost model independent way from the ratio of the p spectra from d - d and d - p reactions.