Ab-initio computation of neutron-rich oxygen isotopes

Details Ab-initio computation of neutron-rich oxygen isotopes Ab-initio computation of neutron-rich oxygen isotopes

2009-07-23

arxiv.org/abs/0907.4167v1

Phys.Rev.C80:021306,2009

Physics

Nuclear Physics

Nuclear Theory

5 pages + eps, 3 figures

Scientific paper

10.1103/PhysRevC.80.021306

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 28O is stable with respect to 24O, while calculations with a momentum cutoff of 600 MeV result in a slightly unbound 28O. 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 28O 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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