Realistic Interactions and Configuration Mixing in Fermionic Molecular Dynamics

TL;DR

This paper investigates how the intrinsic structure of many-body states in Fermionic Molecular Dynamics influences multifragmentation in heavy-ion collisions, exploring effective interactions and configuration mixing.

Contribution

It introduces a new approach to derive effective interactions using a unitary correlation operator and presents initial results on mixing multiple Slater determinants.

Findings

Multifragmentation depends on the intrinsic structure of many-body states.

Effective interactions derived from realistic potentials can vary in predicting nuclear properties.

Initial mixing of Slater determinants shows promising results for dynamical calculations.

Abstract

In Fermionic Molecular Dynamics the occurrence of multifragmentation depends strongly on the intrinsic structure of the many-body state. Slater determinants with narrow single-particle states and a cluster substructure show multifragmentation in heavy-ion collisions while those with broad wave functions, which resemble more a shell-model picture, deexcite by particle emission. Which of the two type of states occurs as the ground state minimum or as a local minimum in the energy depends on the effective interaction. Both may equally well reproduce binding energy and radii of nuclei. This ambiguity led us to reinvestigate the derivation of the effective interaction from realistic nucleon-nucleon potentials by means of a unitary correlation operator which is much more suited for dynamical calculations than the G-matrix or the Jastrow method. First results of mixing many Slater determinants are also presented.