Orateur
Description
Atomic nuclei exhibit multiple energy scales ranging from hundreds of MeV in binding energies to fractions of an MeV for low-lying collective excitations. Describing these different energy scales within an ab-initio framework is a long-standing challenge that we overcome by using high-performance computing, many-body methods with polynomial scaling, and ideas from effective-field-theory. With this approach we accurately describe the first 2+ and 4+ energies and the quadrupole transitions from the first 2+ to the ground-state in neon isotopes. For 32,34Ne less is known and we predict that they are strongly deformed and collective. For 30Ne we interestingly find that a deformed and nearly spherical shape coexist, similar to what is seen in 32Mg. We also confirm that 78Ni has a low-lying rotational band, and that deformed ground states and shape coexistence emerge along the magic neutron number N = 50 towards the key nucleus 70Ca. On the neutron-deficient side we also addressed structure of nuclei around the strongly deformed N = Z = 40 nucleus 80Zr, although there are challenges our results are competitive with mean-field calculations. With this talk I hope to convey that the accurate computation of multiscale nuclear physics demonstrates the predictive power of modern ab initio methods.
