Rotational structure of T=0 and T=1 bands in the N=Z nucleus 62Ga Original Research Article

The rotational behavior 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 View the MathML source, used in the shell model calculation, is found sufficient while also View the MathML source becomes important above the backbending.