Ab initio coupled-cluster calculations of ground and dipole excited states in He8

Bonaiti, F.; Bacca, S.; Hagen, Gaute

doi:10.1103/physrevc.105.034313

Ab initio coupled-cluster calculations of ground and dipole excited states in He 8

Journal Article · Thu Mar 10 00:00:00 EST 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.105.034313· OSTI ID:1855629

Bonaiti, F. ^[1]; ^[1]; ^[2]

Johannes Gutenberg-Univ., Mainz (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

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 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. Lastly, we compute the electric dipole polarizability, providing a theoretical benchmark for future experimental determinations that will study this exotic nucleus.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1855629

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 105; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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