Gamma-ray angular distribution in Coulomb excitation experiments at intermediate energies as a signature of electromagnetic and nuclear forces in peripheral collisions

In Coulex experiments at intermediate beam energies be sides electromagnetic forces the nuclear interaction may occur. These two excitation mechanisms result in emission of gamma-rays with a characteristic angular distribution W(theta). Measurement of W(theta) was performed at the RISING fast beam set-up to probe the electromagnetic-nuclear interface. Unexpectedly large hadronic-like contribution was observed when high Z projectiles were used.