Electronic Resource
Springer
The European physical journal
298 (1980), S. 129-141
ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The quantal description of the relative motion of two complex nuclei is discussed on the basis of a Wigner transformed reduced von-Neumann equation which reduces to a transport equation of the Fokker-Planck type in the classical limit. For relative motion in three spatial dimensions a partial waves expansion of the reduced density operator leads to a set of equations for a matrix of quantal Wigner functionsρ ll′ ω (R, K) which decouple if angular momentum transfer is neglected. It is shown that the evolution inR-space of the radial momentum distributionsρ ll′ ω (R, K) is sufficiently well described by incorporating only statistical fluctuations, and that the effect of quantal fluctuations in the double differential cross sectiond 2 σ/dθdE is mainly due to the interference of the contributions from various partial waves. An application to the reaction40Ar→232Th atE lab=388 MeV based on the same nucleus-nucleus potential and the same transport coefficients as classical models shows that the coherent summation of the contributions of all partial waves reproduces in a natural way the large experimentally observed spreading in the Wilczynski plot in the quasi-elastic region.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01554053
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