Out-of-plane correlations of α-particles and heavy ions in the reaction of 373 MeV 32S with gold

Out-of-plane correlations between α-particles and projectile-like heavy ions have been measured for the system 32S+197Au at Esub(LAB)=373 MeV. The angular widths of the correlations range from 240 to 400 (FWHM) depending on the Z of the heavy ion. In the framework of a model calculation these widths are shown to be very sensitive to the out-of-plane momentum of the α-particle at emission. It is concluded that only little heating of the reaction partners occurs prior to α-particle emission. (orig.)