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The angular dependence of proton-proton correlation functions is studied incentral $^{40}Ca+^{40}Ca$ and $^{48}Ca+^{48}Ca$ nuclear reactions at E=80MeV/A. Measurements were performed with the HiRA detector complemented by the4$\pi$ Array at NSCL. A striking angular dependence in the laboratory frame isfound within p-p correlation functions for both systems that greatly exceedsthe measured and expected isospin dependent difference between the neutron-richand neutron-deficient systems. Sources measured at backward angles reflect theparticipant zone of the reaction, while much larger sources observed at forwardangles reflect the expanding, fragmenting and evaporating projectile remnants.The decrease of the size of the source with increasing momentum is observed atbackward angles while a weaker trend in the opposite direction is observed atforward angles. The results are compared to the theoretical calculations usingthe BUU transport model.

Angular Dependence in Proton-Proton Correlation Functions in Central $^{40}Ca+^{40}Ca$ and $^{48}Ca+^{48}Ca$ Reactions