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Physics Letters B

Volume 234, Issue 4, 18 January 1990, Pages 425-429
Physics Letters B

A new collective excitation: The F-spin-vector, gamma-vibration

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Abstract

We apply the Tamm-Dancoff approximation in order to investigate vibrational excitations in the F-spin-symmetric O(6) limit of the proton-neutron interacting boson model. In addition to the well-known K = 1 scissors mode, we find a second F-spin-vector, K = 2, vibrational mode. The K = 2 surface distortions of the proton and neutron fluids, respectively, oscillate against each other. Since the proton-neutron interaction restrains this motion, the new collective mode is expected to lie at sizeable excitation energies of about 2 MeV, as opposed to the soft, in-phase γ-motion of the fluids, which is spurious, zero-energy mode.

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  • Level scheme and mixed-symmetry states of <sup>134</sup>Ba from in-beam (n, n′γ) measurements

    1992, Nuclear Physics, Section A

  • Proton-neutron modes in non-axial nuclei

    1991, Physics Letters B

  • Search for various collective excitation modes with the (n, n'γ) reaction

    1991, Acta Physica Hungarica
1

Fellow of the Consejo Nacional de Investigaciones Cientificas y Technicas, Argentina.

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