0 Rotational structure of T = 0 and T = 1 bands in the N = Z nucleus 62
نویسندگان
چکیده
The rotational behavior of T=0 and T=1 bands in the odd-oddN=Z nucleus Ga 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.
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