期刊
PHYSICAL REVIEW C
卷 80, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.80.021306
关键词
-
资金
- US Department of Energy [DE-AC05-00OR22725, DE-FC02-07ER41457, DE-FG02-96ER40963]
We compute the binding energy of neutron-rich oxygen isotopes and employ the coupled-cluster method and chiral nucleon-nucleon interactions at next-to-next-to-next-to-leading order with two different cutoffs. We obtain rather well-converged results in model spaces consisting of up to 21 oscillator shells. For interactions with a momentum cutoff of 500 MeV, we find that O-28 is stable with respect to O-24, while calculations with a momentum cutoff of 600 MeV result in a slightly unbound O-28. The theoretical error estimates due to the omission of the three-nucleon forces and the truncation of excitations beyond three-particle-three-hole clusters indicate that the stability of O-28 cannot be ruled out from ab initio calculations, and that three-nucleon forces and continuum effects play the dominant role in deciding this question.
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