1. 1 Probing mean field theory in the nuclear interior Bernard Frois CEA-DRT bernard.frois@cea.fr

2. 2 Celebrating Daniel Gogny

3. A great friend Working with him and his group was a pleasure. We achieved a lot together. Great sense of humor. « Bon vivant » Very French, wonderful smile, cheerful. A sense of elegance and style An impressive smoker 3

4. A great physicist Very sharp. World Class. Superb knowledge in Physics and Maths. Original, profound, intense in his work, perfectionist Liked to work at the blackboard A constellation of collaborators An artist … 4

5. 5 1950’s Robert Hofstadter Nobel Prize in Electron scattering 1974 Visitor at CEA –Saclay

6. 6 This figure gives a summary of the approximate charge density distributions found for various nuclei studied by electron scattering at Stanford University (R. Hofstadter)

7. 7 1960 – 1970 Bethe, Bruckner, Goldstone Significant disagreement with experimental properties of nuclear matter 1970: Orsay group plays a leading role in the new generation HF calculations and Vnn Hans Bethe, Nobel Laureate Marcel Veneroni « Le Maître » plays a central role.

8. 8 Is the shell model valid in the nuclear interior ? Maria Goeppert-Mayer

9. 1975 – 1985 « Teaming Up » A wealth of high momentum electron scattering data measured at CEA-Saclay A powerful interaction between Saclay and Bruyères le Châtel groups 9

10. 10 Daniel Gogny develops his finite range force with his group and his HFB calculations in the 70’s Daniel Gogny got the Prix Joliot-Curie in 1986

11. 11 1977 High momentum electron at CEA-Saclay allowed for the first time to probe the fine details of the nucleus Note that this is a classic interference experiment. Electrons one by one follow the interference pattern. Each electron wave interfers with itself.

12. 12

13. 13 3s ? 3s

14. 14 Correlations deplete the valence orbit

15. 15 No problem in the nuclear interior. Pauli principle blocks the strong NN interaction at short distances. A problem of correlations at the fermi surface

16. This body of work has provided firm benchmarks against which to test our understanding of the nuclear many-body problems

17. 17 INPC98 The young generation is ready