Microscopic optical potentials for calcium isotopes

Rotureau, Jimmy; Danielewicz, P.; Hagen, Gaute; Jansen, Gustav R.; Nunes, F. M.

doi:10.1103/PhysRevC.98.044625

Title: Microscopic optical potentials for calcium isotopes

Journal Article · 29 October 2018 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.98.044625 · OSTI ID:1545568

Rotureau, Jimmy ^[1]; Danielewicz, P. ^[1];

^[2];

^[3]; Nunes, F. M. ^[1]

Michigan State Univ., East Lansing, MI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We construct nucleonic microscopic optical potentials by combining the Green's function approach with the coupled-cluster method for ⁴⁰Ca and ⁴⁸Ca. For the computation of the ground states of ⁴⁰Ca and ⁴⁸Ca, we use the coupled-cluster method in the singles-and-doubles approximation, while for the A = ±1 nuclei we use particle-attached and particle-removed equation-of-motion method truncated at two-particle–one-hole and one-particle–two-hole excitations, respectively. Our calculations are based on the chiral nucleon-nucleon and three-nucleon interaction NNLO_sat, which reproduces the charge radii of ⁴⁰Ca and ⁴⁸Ca, and the chiral nucleon-nucleon interaction NNLO_opt. In all cases considered here, we observe that the overall form of the neutron scattering cross section is reproduced for both interactions, but the imaginary part of the potential, which reflects the loss of flux in the elastic channel, is negligible. Furthermore, the latter points to neglected many-body correlations that would appear beyond the coupled-cluster truncation level considered in this work. We show that, by artificially increasing the parameter η in the Green's function, practical results can be further improved.

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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:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1545568

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 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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