for the “nuclear billiard” are dissimilar for the studied multipolarities. For the first two multipole degrees we noticed a more rapid emergence of chaotic states as moving on towards higher radian frequencies of oscillation. When analyzing the system with quadrupole collective deformations of the potential well, an order-strong chaos-weak chaos-order sequence is revealed. Still, as emphasized in the “Shannon entropies” subsection, the quadrupole case represents an intricate one, and further analysis would be required before concluding it.

Every type of quantitative analysis strengthened previous results regarding the monopolar intermittency route to chaos for the “nuclear billiard”. The collective oscillation frequency for the intermittent behaviour was located prior to the resonance state of interaction (at $\Omega =0.1\ c/\rm{fm}$).

Further studies along the above issues are currently in progress. The used formalism can be improved by adding spin and charge to the nucleons. A semi-quantal treatment of this problem, including Pauli blocking effect, is hoped to shed more light on the discussed issue in the near future.

We wish to thank to R.I. Nanciu, I.S. Zgură, A.Ş. Cârstea, G. Păvălaş, S. Zaharia, A. Gheaţă, M. Rujoiu, A. Mitruţ, and R. Mărginean for fruitful discussions on this paper.

G.F. Burgio, M. Baldo, A. 