Rotational Structure of T=0 and T=1 bands in the N=Z Nucleus 62Ga

Details Rotational Structure of T=0 and T=1 bands in the N=Z Nucleus 62Ga Rotational Structure of T=0 and T=1 bands in the N=Z Nucleus 62Ga

2000-05-08

arxiv.org/abs/nucl-th/0005018v1

Nucl.Phys. A683 (2001) 207-226

Physics

Nuclear Physics

Nuclear Theory

19 pages with 9 figures, submitted to Nucl.Phys.A

Scientific paper

10.1016/S0375-9474(00)00441-3

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 I\pi=9+ and I\pi=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 \gamma) and intermediate axis (negative \gamma), respectively. At lower spins the configuration space pf_{5/2}g_{9/2}, used in the shell model calculation, is found sufficient while also f_{7/2} becomes important above the backbending.

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