NEUTRON-PROTON INTERFEROMETRY IN 30A MEV AR-40-197 COLLISIONS(AU)

Neutron-proton correlation functions in 30A MeV Ar-40+Au-197, C-12, CH 2 reactions have been measured. In contrast to the nn and pp correlati ons, which exhibit the shape expected from quantum symmetrization effe cts and nuclear+Coulomb (pp) final-state interaction, the np function shows much less correlation strength. This may be due to Coulomb repul sion on the proton and/or to a larger effective spin than expected. Se lecting high energy nucleons strengthens both the np and pp correlatio ns.