Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model

Details Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model

2007-05-28

arxiv.org/abs/0705.4069v1

Phys.Rev.Lett.99:092501,2007

Physics

Nuclear Physics

Nuclear Theory

4 pages, 5 figures, 1 table

Scientific paper

10.1103/PhysRevLett.99.071302

We propose an importance truncation scheme for the no-core shell model, which enables converged calculations for nuclei well beyond the p-shell. It is based on an a priori measure for the importance of individual basis states constructed by means of many-body perturbation theory. Only the physically relevant states of the no-core model space are considered, which leads to a dramatic reduction of the basis dimension. We analyze the validity and efficiency of this truncation scheme using different realistic nucleon-nucleon interactions and compare to conventional no-core shell model calculations for 4He and 16O. Then, we present the first converged calculations for the ground state of 40Ca within no-core model spaces including up to 16\hbar\Omega-excitations using realistic low-momentum interactions. The scheme is universal and can be easily applied to other quantum many-body problems.

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