Nuclear quadrupole moments of 5/2 - and 9/2 - states in 169 Ta

. The nuclear spectroscopic quadrupole moments for the π h 9/2 5/2 - , 1/2 - [541] and the π h 11/2 9/2 - , 9/2 - [514] isomeric states in 169 Ta have been measured employing the time differential perturbed angular-distribution technique following the nuclear reaction 159 Tb( 16 O, 6nγ) 169 Ta at beam energy 104 MeV. The ratio of the intrinsic quadrupole moments Q_0(K^ = 5/2^-)/Q_0(K^ = 9/2^-) has been derived as 1.87(13) from the measured quadrupole precession frequencies of the corresponding states. The model-independent analysis of the equilibrium deformation indicates strong prolate- and oblate-driving nature of the 1/2 - [541] and 9/2 - [514] orbitals in 169,171 Ta isotopes, respectively.