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- Title
"Stiff" deformed nuclei, configuration dependent pairing and the β and γ degrees of freedom.
- Authors
Sharpey-Schafer, J. F.; Bark, R. A.; Bvumbi, S. P.; Dinoko, T. R. S.; Majola, S. N. T.
- Abstract
We review the current experimental data on collective structures within the pairing gap of even-even deformed nuclei, with emphasis on nuclei near mass number A∼150. The essential physics that determines the characteristics of the first excited 0+ (02+) state in these nuclei has been in dispute for several decades. Interpretation of these states in terms of surface β quadrupole vibrations has often been challenged. We examine the role that configuration dependent pairing can play in these levels particularly at the onset of deformation as major shells fill. In all deformed nuclei rotational bands are found experimentally, starting at a state with spin 2+ with excitation energies near the middle of the pairing gap. These rotational bands, with quantum number Kπ=2+, are usually referred to as γ bands and have been identified with quadrupole surface vibrations in the plane perpendicular to the major axis of deformation. However Kπ=2+ bands can also arise due to the breaking of axial symmetry of the quadrupole shape. We discuss data that can help with these different interpretations.
- Subjects
HEAVY nuclei; QUADRUPOLES; QUANTUM numbers; PAIRING correlations (Nuclear physics); VIBRATION (Mechanics)
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2019, Vol 55, Issue 2, p1
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/i2019-12665-x