Comment on "Ab Initio study of 40-Ca with an importance-truncated no-core shell model"

Details Comment on "Ab Initio study of 40-Ca with an importance-truncated no-core shell model" Comment on "Ab Initio study of 40-Ca with an importance-truncated no-core shell model"

2007-09-04

arxiv.org/abs/0709.0449v1

Phys.Rev.Lett.101:119201,2008

Physics

Nuclear Physics

Nuclear Theory

1 page, comment on arXiv:0705.4069 (PRL 99, 092501 (2007))

Scientific paper

10.1103/PhysRevLett.101.119201

In a recent Letter [Phys. Rev. Lett. 99, 092501 (2007)], Roth and Navratil present an importance-truncation scheme for the no-core shell model. The authors claim that their truncation scheme leads to converged results for the ground state of 40-Ca. We believe that this conclusion cannot be drawn from the results presented in the Letter. Furthermore, the claimed convergence is at variance with expectations of many-body theory. In particular, coupled-cluster calculations indicate that a significant fraction of the correlation energy is missing.

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