Chiral three-nucleon forces and bound excited states in neutron-rich oxygen isotopes. Holt, J. D., Menéndez, J., & Schwenk, A. European Physical Journal A, 49(3):1–6, 2013.
doi  abstract   bibtex   
We study the spectra of neutron-rich oxygen isotopes based on chiral two-and three-nucleon interactions. First, we benchmark our many-body approach by comparing ground-state energies to coupled-cluster results for the same two-nucleon interaction, with overall good agreement. We then calculate bound excited states in21,22,23O, focusing on the role of three-nucleon forces, in the standard sd shell and an extended sdf7/2p3/2 valence space. Chiral three-nucleon forces provide important one-and two-body contributions between valence neutrons. We find that both these contributions and an extended valence space are necessary to reproduce key signatures of novel shell evolution, such as the N = 14 magic number and the low-lying states in 21O and 23O, which are too compressed with two-nucleon interactions only. For the extended space calculations, this presents first work based on nuclear forces without adjustments. Future work is needed and open questions are discussed.
@article{Holt2013,
abstract = {We study the spectra of neutron-rich oxygen isotopes based on chiral two-and three-nucleon interactions. First, we benchmark our many-body approach by comparing ground-state energies to coupled-cluster results for the same two-nucleon interaction, with overall good agreement. We then calculate bound excited states in21,22,23O, focusing on the role of three-nucleon forces, in the standard sd shell and an extended sdf7/2p3/2 valence space. Chiral three-nucleon forces provide important one-and two-body contributions between valence neutrons. We find that both these contributions and an extended valence space are necessary to reproduce key signatures of novel shell evolution, such as the N = 14 magic number and the low-lying states in 21O and 23O, which are too compressed with two-nucleon interactions only. For the extended space calculations, this presents first work based on nuclear forces without adjustments. Future work is needed and open questions are discussed.},
archivePrefix = {arXiv},
arxivId = {1108.2680},
author = {Holt, J. D. and Men{\'{e}}ndez, J. and Schwenk, A.},
doi = {10.1140/epja/i2013-13039-2},
eprint = {1108.2680},
issn = {1434601X},
journal = {European Physical Journal A},
number = {3},
pages = {1--6},
title = {{Chiral three-nucleon forces and bound excited states in neutron-rich oxygen isotopes}},
volume = {49},
year = {2013}
}

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