Evolution Of The Mixed-Symmetry 2(1,Ms)(+) Quadrupole-Phonon Excitation From Spherical To Gamma-Soft Xe Nuclei

Low-lying collective states of Xe-130,Xe-132 have been investigated by gamma-ray spectroscopy following (12C)(Xe,Xe*)C-12 projectile Coulomb excitation. The one- phonon 2(1,ms)(+) states have been identified: the 2(4)(+) state at 2150 keV with B(M1; 2(4)(+) -> 2(1)(+)) = 0.15(4)mu(2)(N) N in Xe-130 and the 2(3)(+) state at 1985 keV with B(M1;2(3)(+) -> 2(1)(+)) = 0.22(6)mu(2)(N) in Xe-132. The evolution of the one- phonon 2(1,ms)(+) states in the even- even stable xenon isotopic chain from the vibrators near N = 82 to the gamma-soft nuclei toward midshell is discussed.