Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Structure and Dynamics of Nuclei IV

HK 18.3: Vortrag

Montag, 28. März 2022, 16:45–17:00, HK-H7

Ground and dipole excited states of the ⁸He halo nucleus from ab initio coupled-cluster theory — •Francesca Bonaiti¹, Sonia Bacca^{1, 2}, and Gaute Hagen^{3, 4} — ¹Institut für Kernphysik and PRISMA⁺ Cluster of Excellence, Johannes Gutenberg-Universität, 55128 Mainz, Germany — ²Helmholtz-Institut Mainz, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany — ³Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA — ⁴Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA

We perform coupled-cluster calculations of ground- and dipole excited-state properties of the ⁸He halo nucleus with nucleon-nucleon and three-nucleon interactions from chiral effective field theory, both with and without explicit delta degrees of freedom. By increasing the precision in our coupled-cluster calculations from inclusion of leading order three-particle three-hole excitations in the cluster operator, we are able to reproduce (within uncertainties) the available experimental data for the ground-state energy and the charge radius. We also investigate the excited states induced by the electric dipole operator and present a discussion on the Thomas-Reiche-Kuhn and cluster sum rules. Finally, we compute the electric dipole polarizability, providing a theoretical benchmark for future experimental determinations that will study this exotic nucleus.