Abstract
Coupled cluster theory is an attractive tool to solve the quantum many-body problem because its singles and doubles (CCSD) approximation is computationally affordable and yields about 90% of the correlation energy. Capturing the remaining 10%, e.g., via including triples, is numerically expensive. Here, we assume that short-range three-body correlations dominate and---following Lepage (arXiv:nucl-th/9706029)---that their effects can be included within CCSD by renormalizing the three-body contact interaction. We renormalize this contact in $^{16}\mathrm{O}$ and obtain systematically improved CCSD results for $^{24}\mathrm{O}, ^{20--34}\mathrm{Ne}, ^{40,48}\mathrm{Ca}, ^{78}\mathrm{Ni}, ^{90}\mathrm{Zr}$, and $^{100}\mathrm{Sn}$.
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