Speaker
Prof.
Robert Roth
(TU Darmstadt)
Description
The ab initio description of nuclear structure and reactions has seen remarkable progress over the past decade, driven by groundbreaking advances in nuclear many-body theory and the advent of two- and multi-nucleon interactions from chiral effective field theory. As a result, ab initio calculations are now possible for an unprecedented range of nuclei and observables.
I will discuss the transfer of the most advanced nuclear structure tools to the ab initio description of hypernuclei. Starting from two- and three-baryon interactions from chiral effective field theory, we adopt the similarity renormalization group to pre-diagonalize the Hamiltonian and enhance the convergence of the subsequent many-body calculation. Using the no-core shell model we then compute ground and excited states and the full spectroscopy of single-strange hypernuclei throughout the p-shell. For all steps of the calculation explicit $\Lambda$ and $\Sigma$ hyperons are included with their physical masses and with the $\Lambda\Sigma$ conversion terms of the hyperon-nucleon interaction. I will show that the $\Lambda\Sigma$ conversion plays a crucial role in hypernuclear structure and has profound implications for the so-called hyperon puzzle in neutron-star physics. Furthermore, I will discuss first ab initio calculations for light neutron-rich hypernuclei out to the neutron dripline.
Primary author
Prof.
Robert Roth
(TU Darmstadt)
Co-author
Dr
Roland Wirth
(TU Darmstadt)
