Tests of shell-model truncation methods - art. no. 057302

Truncation methods for the nuclear shell model are tested and compared in t erms of properties of Si-28, Al-28, and Mg-40. Included are the traditional methods based on energy denominators and the number of particle-hole excit ations, as well as a newer procedure which takes into account the two-body interactions. For nuclei with T>>0 the newer method is found appreciably be tter than the traditional methods, which are about equal. For nuclei with N approximate to Z there is little difference among the three methods.