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Title: Computing the dipole polarizability of Ca 48 with increased precision

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 m 0 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 N 2LO 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 N 2LO 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 inmore » the ground state is important, while it is less so for the excited states and the similarity-transformed dipole operator.« less
Authors:
 [1] ;  [2] ; ORCiD logo [3] ; ORCiD logo [4]
  1. TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
  2. Johannes Gutenberg-Univ. Mainz, Mainz (Germany); TRIUMF, Vancouver, BC (Canada); Univ. of Manitoba, Winnipeg, MB (Canada)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-96ER40963; SC0008499; SC0018223; ERKBP57; ERKBP72
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1471875
Alternate Identifier(s):
OSTI ID: 1461225

Miorelli, Mirko, Bacca, S., Hagen, Gaute, and Papenbrock, Thomas F.. Computing the dipole polarizability of Ca48 with increased precision. United States: N. p., Web. doi:10.1103/PhysRevC.98.014324.
Miorelli, Mirko, Bacca, S., Hagen, Gaute, & Papenbrock, Thomas F.. Computing the dipole polarizability of Ca48 with increased precision. United States. doi:10.1103/PhysRevC.98.014324.
Miorelli, Mirko, Bacca, S., Hagen, Gaute, and Papenbrock, Thomas F.. 2018. "Computing the dipole polarizability of Ca48 with increased precision". United States. doi:10.1103/PhysRevC.98.014324.
@article{osti_1471875,
title = {Computing the dipole polarizability of Ca48 with increased precision},
author = {Miorelli, Mirko and Bacca, S. and Hagen, Gaute and Papenbrock, Thomas F.},
abstractNote = {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 N2LOsat 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 N2LOsat. 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.},
doi = {10.1103/PhysRevC.98.014324},
journal = {Physical Review C},
number = 1,
volume = 98,
place = {United States},
year = {2018},
month = {7}
}