| Abstract: | In many-body perturbation theory(MBPT) we always introduce a parameter Nshellto measure the maximal allowed major harmonic-oscillator(HO) shells for the single-particle basis, while the no-core shell model(NCSM) uses N_(max)h? HO excitation truncation above the lowest HO configuration for the many-body basis. It is worth comparing the two different methods. Starting from "bare" and Okubo-Lee-Suzuki renormalized modern nucleon-nucleon interactions, NNLO_(opt) and JISP16, we show that MBPT within Hartree-Fock bases is in reasonable agreement with NCSM within harmonic oscillator bases for ~4He and ~(16)O in "close" model space. In addition, we compare the results using "bare" force with the Okubo-Lee-Suzuki renormalized force. |
