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Related Experiment Videos

Coupled-cluster and configuration-interaction calculations for heavy nuclei.

M Horoi1, J R Gour, M Włoch

  • 1Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.

Physical Review Letters
|May 16, 2007
PubMed
Summary
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Coupled-cluster (CC) and configuration-interaction (CI) methods accurately model correlated fermions. Practical CC approximations match demanding CI results for (56)Ni, showing their efficiency.

Area of Science:

  • Nuclear physics
  • Quantum chemistry

Background:

  • Coupled-cluster (CC) and configuration-interaction (CI) are key quantum many-body methods.
  • Accurate modeling of correlated fermions is crucial for nuclear structure and quantum chemistry.

Purpose of the Study:

  • Compare CC and CI methods for (56)Ni within the pf-shell.
  • Evaluate practical CC approximations for large-scale fermion systems.

Main Methods:

  • Utilized the pf-shell basis for calculations.
  • Employed CC approximations including 1p-1h, 2p-2h, and noniterative 3p-3h clusters.
  • Compared results with CI calculations truncated at 4p-4h.

Main Results:

  • CC and CI methods provide comparable results for (56)Ni.

Related Experiment Videos

  • The CC method with specific cluster treatments achieves accuracy similar to more complex CI approaches.
  • Method performance is independent of the energy gap between specific orbits.

    • Conclusions:

    • Practical CC approximations offer a computationally efficient alternative to demanding CI methods.
    • These CC methods are suitable for studying systems with a large number of correlated fermions.