Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-12-13
Proceedings of the 11th International Conference on Nuclear Reaction Mechanisms, Varenna June 12-16 2006, p. 63. (Edited by E.
Physics
Nuclear Physics
Nuclear Theory
10 pages, 5 figures
Scientific paper
The fundamental ingredients of the MCAS (multi-channel algebraic scattering) method are discussed. The main feature, namely the application of the sturmian theory for nucleon-nucleus scattering, allows solution of the scattering problem given the phenomenological ingredients necessary for the description of weakly-bound (or particle-unstable) light nuclear systems. Currently, to describe these systems, we use a macroscopic, collective model. Analyses show that the couplings to low-energy collective-core excitations are fundamental but they are physically meaningful only if the constraints introduced by the Pauli principle are taken into account. For this we introduce in the nucleon-nucleus system the Orthogonalizing Pseudo-Potential formalism, extended to collective excitations of the core. The formalism leads one to discuss a new concept, Pauli hindrance, which appears to be important especially to understand the structure of weakly-bound and unbound systems.
Amos Ken
Canton Luciano
Karataglidis Steven
Pisent G.
Svenne J. P.
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