Truncation method for shell model calculations.

@article{Horoi1994TruncationMF,
  title={Truncation method for shell model calculations.},
  author={Horoi and Brown and Zelevinsky},
  journal={Physical review. C, Nuclear physics},
  year={1994},
  volume={50 5},
  pages={
          R2274-R2277
        }
}
A method of truncating the large shell model basis is outlined. It relies on the order given by the unperturbed energies of the basis states and on the constancy of their spreading widths. Both quantities can be calculated by a simple averaging procedure. The method is tested in the [ital sd] shell where the [ital JT] dimensions are of the order of a few thousand. It proves to be very effective in the middle of the [ital fp] shell where [ital JT] dimensions of the order of a few times 10[sup 6… 
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