Proton-proton and deuteron-deuteron correlations in interactions of relativistic helium nuclei with protons

The reactions4Hep ?pp+X,3Hep ?pp+X and4Hep ?ddp have been investigated and the correlation function has been measured for protons and deuterons with small relative momenta. Strong positive correlation has been observed for protons related mainly to the final state interactions in1S0 state. The root mean square radius of the proton source calculated from the correlation function has been found to be equal to (1.7±0.3) fm and (2.1±0.3) fm for4He and3He respectively. It agrees with the known radii of these nuclei.