Two- and Four-Quasiparticle States in Spherical Vibrational Nuclei
- 20 March 1967
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 155 (4) , 1144-1155
- https://doi.org/10.1103/physrev.155.1144
Abstract
Expressions are derived in the modified Tamm-Dancoff (TD) approximation which take into account the mixing of zero-, two-, and four-quasiparticle states for the description of the collective vibrational states of spherical nuclei. The proposed method is free from two very important defects inherent in the higher random-phase approximation (HRPA), namely, nonorthonormality and redunancy of the four-quasiparticle basic states. The relative merits of the present method over the existing one (HRPA) are discussed.Keywords
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