Barrier and internal wave contributions to the quantum probability density and flux in light heavy-ion elastic scattering

We investigate the properties of the optical model wave function for light heavy-ion systems where absorption is incomplete, such as $\alpha + ^{40}$Ca and $\alpha + ^{16}$O around 30 MeV incident energy. Strong focusing effects are predicted to occur well inside the nucleus, where the probability density can reach values much higher than that of the incident wave. This focusing is shown to be correlated with the presence at back angles of a strong enhancement in the elastic 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 decompose the scattering wave function and the associated probability flux into their barrier and internal wave contributions within a fully quantal 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.Comment: 16 pages, 15 figures. RevTeX file. To appear in Phys. Rev. C. The figures are only available via anonynous FTP on ftp://umhsp02.umh.ac.be/pub/ftp_pnt/figscat

De onderwijzer en de cultuuroverdracht

Contains fulltext : mmubn000001_006093590.pdf (publisher's version ) (Open Access)Promotor : F. RuttenVIII, 122 p

Preference for particular study and university 1964

Preferences ( ranking ) for specific university/ for field of study / occupational values. Background variables: basic characteristics/ residence/ occupation/employment/ education/ religio

Studiekeuze eerstejaars studenten 1964

Preferences ( ranking ) for specific university/ for field of study / occupational values. Background variables: basic characteristics/ residence/ occupation/employment/ education/ religio