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

Scientific paper - Original scientific paper

• Author: S. Cacciamani
• Author: G. Bonsignori
• Author: F. Iachello
• Author: Dario Vretenar
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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.

• Keywords (english): interacting boson model; high spin states; broken pairs; 116 Sn; 82 Sr
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C - Nuclear Physics
• Numbering: vol. 53, no. 4, pp. 1618-1631
• p-ISSN: 0556-2813
• e-ISSN: 1089-490X
• DOI: https://doi.org/10.1103/PhysRevC.53.1618
• URN:NBN: urn:nbn:hr:217:996353
• Publication: 1996
• Document URL: http://link.aps.org/doi/10.1103/PhysRevC.53.1618
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (1996) by the American Physical Society.
• Created on: 2019-10-04 14:38:00