Particle-hole excitations in the interacting boson model (IV). The U(5)-SU(3) coupling

• Published in: Nuclear physics. A Vol. 651; no. 1; pp. 31 - 55
• Main Authors: De Coster, C., Decroix, B., Heyde, K., Jolie, J., Lehmann, H., Wood, J.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 03.05.1999
• Subjects: I-spin multiplets; Particle-hole excitations; U-SU coupling; 24.80.Dc; I-spin multiplets; 21.60.Ev; 21.60.Fw; U-SU coupling; Particle-hole excitations
• ISSN: 0375-9474
• DOI: 10.1016/S0375-9474(99)00124-4

In the extended interacting boson model (EIBM) both particle- and hole-like bosons are incorporated to encompass multi-particle-multi-hole excitations at and near to closed shells. We apply the group theoretical concepts of the EIBM to the particular case of two coexisting systems in the same nucleus exhibiting a U(5) (for the regular configurations) and an SU(3) symmetry (for the intruder configurations). Besides the description of “global” symmetry aspects in terms of I-spin, also the very specific local mixing effects characteristic for the U(5)-SU(3) symmetry coupling are studi d. The model is applied to the Po isotopes and a comparison with a more realistic calculation is made.