@article{Lisetskiy2009,
abstract = {We construct effective two-body Hamiltonians and E2 operators for the p shell by performing 16 $\Omega$ ab initio no-core shell model (NCSM) calculations for A=5 and A=6 nuclei and explicitly projecting the many-body Hamiltonians and E2 operator onto the 0 $\Omega$ space. We then separate the effective E2 operator into one-body and two-body contributions employing the two-body valence cluster approximation. We analyze the convergence of proton and neutron valence one-body contributions with increasing model space size and explore the role of valence two-body contributions. We show that the constructed effective E2 operator can be parametrized in terms of one-body effective charges giving a good estimate of the NCSM result for heavier p-shell nuclei. {\textcopyright} 2009 The American Physical Society.},
author = {Lisetskiy, A. F. and Kruse, M. K.G. and Barrett, B. R. and Navratil, P. and Stetcu, I. and Vary, J. P.},
doi = {10.1103/PhysRevC.80.024315},
issn = {1089490X},
journal = {Physical Review C - Nuclear Physics},
month = {aug},
number = {2},
pages = {024315},
title = {{Effective operators from exact many-body renormalization}},
url = {https://link.aps.org/doi/10.1103/PhysRevC.80.024315},
volume = {80},
year = {2009}
}

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