2000/05/08 by A. Juodagalvis, Andrius Juodagalvis, Sven Åberg +1
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Angular momentum #Isoscalar #Isovector #Nuclear physics research studies #Nucleus #Pairing #Quadrupole #Rare-earth and actinide compounds #Rotation (mathematics) #Shell (structure) #Spins #nucl-th
paper · pdf · doi:10.1016/s0375-9474(00)00441-3
published as Nucl.Phys. A683 (2001) 207-226 · 19 pages with 9 figures, submitted to Nucl.Phys.A
arxiv created 2000/05/08 · openalex publication_date 2001/02/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The rotational behaviour of T=0 and T=1 bands in the odd-odd N=Z nucleus 62Ga is studied theoretically using the spherical shell model (laboratory frame) and the cranked Nilsson-Strutinsky model (intrinsic frame). Both models give a good description of available experimental data. The role of isoscalar and isovector pairing in the T=0 and T=1 bands as functions of angular momentum is studied in the shell model. The observed backbending in the T=0 band is interpreted as an unpaired band-crossing between two configurations with different deformation. The two configurations differ by 2p-2h and are found to terminate the rotational properties at Iπ=9+ and Iπ=17+, respectively. E2-decay matrix elements and spectroscopic quadrupole moments are calculated. From the CNS calculation, supported by shell model results, it is suggested that the low spin parts of the bands with T=0 and T=1 correspond to triaxially deformed states with the rotation taking place around the shortest axis (positive γ) and intermediate axis (negative γ), respectively. At lower spins the configuration space pf5/2g9/2, used in the shell model calculation, is found sufficient while also f7/2 becomes important above the backbending.