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Microscopic optical potentials for calcium isotopes
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DOI：10.1103/PhysRevC.98.044625.png)
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摘要
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We construct nucleonic microscopic optical potentials by combining the Green's function approach with the coupled-cluster method for Ca-40 and Ca-48. For the computation of the ground states of Ca-40 and Ca-48, 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 Ca-40 and Ca-48, 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. 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 eta in the Green's function, practical results can be further improved.
Keyword:
COUPLED-CLUSTER THEORY
EFFECTIVE-FIELD THEORY
RESONANT STATES
SCATTERING
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IF:
3.4
论文数:
2.9W
被引数:
5.7W
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