Computing the dipole polarizability of Ca48 with increased precision

Miorelli, Mirko; Bacca, S.; Hagen, Gaute; Papenbrock, Thomas F.

doi:10.1103/PhysRevC.98.014324

Computing the dipole polarizability of ${}^{48}{Ca}$ with increased precision

Journal Article · Mon Jul 23 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.98.014324· OSTI ID:1471875

Miorelli, Mirko ^[1]; Bacca, S. ^[2]; ^[3]; ^[4]

TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
Johannes Gutenberg-Univ. Mainz, Mainz (Germany); TRIUMF, Vancouver, BC (Canada); Univ. of Manitoba, Winnipeg, MB (Canada)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, we compute the electric dipole polarizability of ⁴⁸Ca with an increased precision by including more correlations than in previous studies. Employing the coupled-cluster method we go beyond single and double excitations and include leading-order three-particle-three-hole (3p-3h) excitations for the ground state, excited states, and the similarity-transformed operator. We study electromagnetic sum rules, such as the bremsstrahlung sum rule m₀ and the polarizability sum rule αD using interactions from chiral effective field theory. To gauge the quality of our coupled-cluster approximations we perform several benchmarks with the effective interaction hyperspherical harmonics approach in ⁴He and with self consistent Green's function in ¹⁶O. We compute the dipole polarizability of ⁴⁸Ca employing the chiral interaction N₂LO_sat and the 1.8/2.0 (EM). We find that the effect of 3p-3h excitations in the ground state is small for 1.8/2.0 (EM) but non-negligible for N₂LO_sat. The addition of these new correlations allows us to improve the precision of our ⁴⁸Ca calculations and reconcile the recently reported discrepancy between coupled-cluster results based on these interactions and the experimentally determined αD from proton inelastic scattering in ⁴⁸Ca. For the computation of electromagnetic and polarizability sum rules, the inclusion of leading-order 3p-3h excitations in the ground state is important, while it is less so for the excited states and the similarity-transformed dipole operator.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: DOE Office of Science; USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1471875

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 98; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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