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HK: Hadronen und Kerne

HK 56: Postersitzung

HK 56.6: Poster

Wednesday, March 18, 1998, 17:00–19:00, Foyer

Barrier and Internal Wave Contributions to the Probability Flux in Light Heavy-ion Scattering — •F. Brau¹, F. Michel¹, and G. Reidemeister² — ¹Université de Mons-Hainaut, Belgium — ²Université Libre de Bruxelles, Belgium

We have investigated the properties of the optical model wave functions for systems where absorption is incomplete, like α + ⁴⁰Ca and α + ¹⁶O around 30 MeV incident energy. Strong focusing effects are found to occur well inside the nuclear medium, where the probability density can reach values much higher than that of the incident wave; this focusing is correlated with the presence at large angles of a strong enhancement of the cross section, the so-called ALAS (Anomalous Large Angle Scattering) phenomenon. This is substantiated by calculations of the quantum probability flux and of classical trajectories. To clarify this mechanism, we have decomposed the scattering wave function and the associated probability flux into their barrier and internal wave contributions within a fully quantum calculation. Finally, a calculation of the divergence of the quantum flux shows that when absorption is incomplete, the focal region gives a sizeable contribution to nonelastic processes.