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Title: Microscopic optical potentials for calcium isotopes

Abstract

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 NNLOsat, which reproduces the charge radii of 40Ca and 48Ca, and the chiral nucleon-nucleon interaction NNLOopt. 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.

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [3];  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
OSTI Identifier:
1545568
Alternate Identifier(s):
OSTI ID: 1479607
Grant/Contract Number:  
AC05-00OR22725; FG02-13ER41967; FG52-08NA28552; SC0013365; SC0008499; SC0018223; ERKBP57; ERKBP72
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Rotureau, Jimmy, Danielewicz, P., Hagen, Gaute, Jansen, Gustav R., and Nunes, F. M. Microscopic optical potentials for calcium isotopes. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.98.044625.
Rotureau, Jimmy, Danielewicz, P., Hagen, Gaute, Jansen, Gustav R., & Nunes, F. M. Microscopic optical potentials for calcium isotopes. United States. doi:10.1103/PhysRevC.98.044625.
Rotureau, Jimmy, Danielewicz, P., Hagen, Gaute, Jansen, Gustav R., and Nunes, F. M. Mon . "Microscopic optical potentials for calcium isotopes". United States. doi:10.1103/PhysRevC.98.044625. https://www.osti.gov/servlets/purl/1545568.
@article{osti_1545568,
title = {Microscopic optical potentials for calcium isotopes},
author = {Rotureau, Jimmy and Danielewicz, P. and Hagen, Gaute and Jansen, Gustav R. and Nunes, F. M.},
abstractNote = {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 NNLOsat, which reproduces the charge radii of 40Ca and 48Ca, and the chiral nucleon-nucleon interaction NNLOopt. 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.},
doi = {10.1103/PhysRevC.98.044625},
journal = {Physical Review C},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: Real part of the radial (diagonal) optical potential for the bound states in 41Ca, calculated with the NNLOsat interaction. Results are shown for the $f$7/2, $p$3/2 and $p$1/2 neutron partial waves and for several values of Nmax.

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    Works referencing / citing this record:

    Exploring experimental conditions to reduce uncertainties in the optical potential
    journal, December 2019


    Ab Initio Optical Potentials and Nucleon Scattering on Medium Mass Nuclei
    journal, August 2019