Self-consistent multiparticle-multihole configuration mixing description of nuclear many-body systems

Many-body methods such as shell models or self-consistent mean fields remain among the most used and powerful approaches to the description of nuclei. Based on different philosophies, these methods however differ in the range of masses and physical phenomena they can describe. In this talk we present an approach to nuclear structure that is at the crossroads between these two concepts. This method is based on the determination of a general wave function taken as a superposition of Slater determinants built on a single-particle basis that is solution of a generalized mean-field equation. Full self-consistency is reached as the individual orbitals incorporate part of the nuclear correlations and, in turn, minimize residual many-body interactions. We will present applications of the method to ground and spectroscopic properties of p- and sd-shell nuclei [1]. The impact of the optimization of the orbitals will be emphasized. 

[1] C. Robin et al., Phys. Rev. C 93, 024302 (2016); C. Robin et al, Phys. Rev. C 95, 044315 (2017).