Broken pairs in the interacting boson model: Projection of spurious states

Cacciamani, S. and Bonsignori, G. and Iachello, F. and Vretenar, Dario (1996) Broken pairs in the interacting boson model: Projection of spurious states. Physical Review C, 53 (4). pp. 1618-1631. ISSN 0556-2813

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The interacting boson model is extended by the inclusion of selective noncollective fermion states through the successive breaking of the correlated S and D pairs (s and d bosons). High angular momentum states are generated in this way, and their structure described by the coupling between fermions in broken pairs and the boson core. The model space of bosons and broken pairs contains also unphysical states that are generated automatically when fermions couple to angular momenta JF=0 and 2. A procedure is derived for the projection of spurious components from bases that contain one fermion pair. Spurious states are identified and an algorithm for their projection is constructed. The model is applied to the description of states in the spherical nucleus Sn116, and the weakly deformed nucleus Sr82. Calculated spectra and transition probabilities are compared with experimental data. It is found that projection of spurious states from the model space is essential for a description of excited states with low angular momenta above the yrast, while it is less important for high-spin states close to the yrast line.

Item Type: Article
Keywords: interacting boson model, high spin states, broken pairs, 116 Sn, 82 Sr
Date: April 1996
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1996) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119211
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 14 May 2014 17:55
Last Modified: 14 May 2014 17:55

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