The Feshbach theory of the optical potential naturally leads to a microscopic description of scattering in terms of the many-body self-energy. We consider a recent calculation of this quantity for O and study the possibility of applying it at astrophysical energies. The results obtained for the phase shifts and the O(p,γ) capture suggest that such studies are feasible but the calculations requi...

Given two nearby lying states of a m a n y b o d y system, each one involving m a n y one-par t ic le contributions, it would be very inconvenient to express the difference of the energies of these states as a difference of absolute energy values. Small errors in the absolute values could drast ical ly change the d i f ference. In cases where the energies are inf in i te , their difference make...

Cluster structures within Fermionic Molecular Dynamics T. Neff, H. Feldmeier Gesellschaft für Schwerionenforschung mbH, Planckstraße 1, 64291 Darmstadt, Germany The many-body states in an extended Fermionic Molecular Dynamics approach are flexible enough to allow the description of nuclei with shell model nature as well as nuclei with cluster and halo structures. Different many-body configurati...

The growing interest in the study of natural or artificial nanoscale structures stabilized by a corrugated surface calls for specific models adapted to the awkward symmetry of such systems. In this work the field susceptibility of a system composed of a finite number of micro-systems interacting with a solid surface is derived from a Dyson’s type equation. The many-body character of the interac...

Physical strands or sheets that can be modelled as curves or surfaces embedded in three dimensions are ubiquitous in nature, and are of fundamental importance in mathematics, physics, biology, and engineering. Often the physical interpretation dictates that self-avoidance should be enforced in the continuum model, i.e., finite energy configurations should not self-intersect. Current continuum m...