Nucleus-Dependent Valence-Space Approach to Nuclear Structure

作者：Stroberg, S. R.; Calci, A.; Hergert, H.; Holt, J. D.; Bogner, S. K.; Roth, R.; Schwenk, A.

来源：Physical Review Letters, 2017, 118(3): 032502.

DOI：10.1103/PhysRevLett.118.032502

• SHELL-MODEL
• FIELD-THEORY
• FORCES
• MATTER
• ISOTOPES
• PHYSICS
• IMPACT
• MASS

We present a nucleus-dependent valence-space approach for calculating ground and excited states of nuclei, which generalizes the shell-model in-medium similarity renormalization group to an ensemble reference with fractionally filled orbitals. Because the ensemble is used only as a reference, and not to represent physical states, no symmetry restoration is required. This allows us to capture three-nucleon (3N) forces among valence nucleons with a valence-space Hamiltonian specifically targeted to each nucleus of interest. Predicted ground-state energies from carbon through nickel agree with results of other large-space ab initio methods, generally to the 1% level. In addition, we show that this new approach is required in order to obtain convergence for nuclei in the upper p and sd shells. Finally, we address the 1(+)/3(+) inversion problem in Na-22 and V-46. This approach extends the reach of ab initio nuclear structure calculations to essentially all light- and medium-mass nuclei.

• 出版日期2017-1-20