Abstract
We perform coupled-cluster calculations of ground- and dipole excited-state properties of the He8 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 via the inclusion of leading-order three-particle three-hole excitations in the cluster operator, we obtain a ground-state energy and a charge radius that are consistent with experiment, albeit with a slight underbinding. 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.
| Original language | English |
|---|---|
| Article number | 034313 |
| Journal | Physical Review C |
| Volume | 105 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2022 |
Funding
This work was supported by the Deutsche Forschungsgemeinschaft through Grant No. 279384907–SFB 1245 and through the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” ( EXC 2118/1, Grant No. 39083149); by the Office of Nuclear Physics, U.S. Department of Energy, under Grant No. DE-SC0018223 (NUCLEI SciDAC-4 collaboration) and Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC (ORNL). Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment program and by the supercomputer Mogon at Johannes Gutenberg Universität Mainz. This research used resources of the Oak Ridge Leadership Computing Facility located at ORNL, which is supported by the Office of Science of the Department of Energy under Contract No. DE-AC05-00OR22725.