Présidents de session
Session 13: Ab initio approach
- Petr Navratil (TRIUMF, Vancouver, Canada)
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...
The magnetic dipole moment is one of the fundamental observable in finite nuclei and can tell us how much the nucleus is dominated by the single-particle picture. Reproducing magnetic dipole moments has been one of the major challenges in nuclear ab initio theory. With the valence-space in-medium similarity renormalization group (VS-IMSRG), one of the ab initio calculation methods applicable...
Ab Initio methods aim at providing a unified description of nuclei from realistic two- and three-body interactions. The last ten years have witnessed great progresses in their range of applicability. This includes the possibility to describe higher mass systems, but also the generalization of many-body formalisms to singly and doubly open-shell nuclei. While symmetry-broken single-reference...
The emergence of collective modes such as nuclear clustering has a profound effect on reactions that occur in stellar interiors. Thus, a good description of astrophysical reaction rates needs to properly take into account the clustering (and deformation) aspects of nuclear structure. To demonstrate how this phenomenon arises from the fundamental nuclear interaction we apply the no-core shell...
The discrepancy between the average measured lifetime of trapped ultracold neutrons (τtrap = 879.4 ± 0.6 s) and the average beam measured lifetime of neutrons (τbeam = 888.0 ± 2.0 s) remains unresolved up to now. In 1990 Green and Thomson tried to resolve this puzzle by entering the two-body decay of neutrons (the decay into a hydrogen atom and antineutrino) into consideration. From the...
