By joining our teams, you'll be putting your skills and enthusiasm to work to major projects. The quasi-particle finite amplitude method has become the tool of choice for fast and accurate calculations of the nuclear strength function. Such a method is particularly interesting when applied to deformed nuclei, where traditional approaches based on large matrix diagonalisations become almost intractable. Most of the developments have been made using Hartree-Fock-Bogoliubov solvers based on zero-range Skyrme interactions, but recent work has shown that it is possible to apply the algorithm to numerical solvers using different interactions, such as Gogny and ab-initio. This latter development has been achieved at CEA using a newly created Hartree-Fock-Bogoliubov solver written in C++. The aim of the current project is therefore to extend the code to include the charge exchange process and to calculate β-decay rates for all medium and heavy nuclei between the valley of stability and the neutron drip line, but using a Gogny interaction instead. One of the objectives is to create and share databases of β-decay rates with collaborators working in other directions  in order to make a systematic comparison with existing data and to identify possible outliers and/or discrepancies. As several studies have shown, these calculations are sensitive to the spin-isovector sector of the interaction. By repeating the analysis for some selected Gogny interactions, it will thus be possible to perform a first sensitivity analysis and thus identify possible discrepancies.. As a candidate :  -          You will be actively working on the  developpement of the CEA code for charge-exchange QFAM in C++. -          You will create all the necessary documentation of the new implementation. -          You will perfom  analytical calculations in order to obtain rigorous mathematical expressions to be used in the numerical code. -          You will perform large scale calculations on a cluster. -          You will develop advance tools to analyse the large amount of data originated from the simulations. -          You will work in close contact with the other members of the theory group. -          You will organize meetings with the experimental colleagues in order to better support the ongoing experimental activity.