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Nonperturbative shell-model interactions from the in-medium similarity renormalization group

We present the first ab initio construction of valence-space Hamiltonians for medium-mass nuclei based on chiral two- and three-nucleon interactions using the in-medium similarity renormalization group. When applied to the oxygen isotopes, we find experimental ground-state energies are well reproduced, including the flat trend beyond the drip line at 24O. Similarly, natural-parity spectra in 21,22,23,24O are in agreement with experiment, and we present predictions for excited states in 25,26O. The results exhibit a weak dependence on the harmonic-oscillator basis parameter and reproduce spectroscopy within the standard sd valence space.

preprint2014arXivOpen access
S. K. BognerH. HergertJ. D. HoltA. SchwenkS. BinderA. CalciJ. LanghammerR. Roth
nucl-exnucl-th
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S. K. BognerH. HergertJ. D. HoltA. SchwenkS. BinderA. CalciJ. LanghammerR. Roth

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