Angular Distributions Of Alpha Particles Emitted By Deformed Oriented Nuclei

A detailed quantitative experimental investigation of the influence of nuclear deformation on the angular distribution of a particles emitted by oriented nuclei is reported. The favored ct transitions in the decay of the deformed nuclei Fr-221, Pa-227, and Pa-229 were studied. In all three cases, very large anisotropies have been observed. The results are in good agreement with calculations based on a particle tunneling through a deformed Coulomb barrier.