Abstract
A low-lying state of 132, 134, 136, 138Ba, strongly excited in the scattering of 20 MeV α-particles at 175°, is identified as the first 3− octupole vibrational state in each case. Angular distribution measurements for α-particle scattering to this state and the well-known first 2+ state in 132, 134, 136, 138Ba are in agreement with harmonic-vibration coupled-channel predictions. Deformation parameters are obtained, and the deduced isoscalar transition rates are compared with measured electromagnetic transition rates. The first 3− states of 132, 134, 136, 138Ba are found to be at excitation energies of 2.070, 2.251, 2.529 and 2.879 MeV, respectively. A state in 130Ba at an excitation energy of 1.948 MeV is tentatively identified as the first octupole-vibrational state in this nucleus.
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