Abstract
Excited states of the nuclei Te-122,Te-126,Te-130 were populated via the
(gamma,gamma') reaction at endpoint energies of the bremsstrahlung
between 4.5 and 5.5 MeV. Gamma rays were detected with a EUROBALL
CLUSTER detector and a single HPGe detector, In all investigated nuclei
two or three prominent dipole transitions were identified at E-gamma
approximate to 3 MeV, The corresponding low-lying J = 1 states are
interpreted as two-phonon excitations. Quasiparticle-phonon-model
calculations predict at about 3 MeV one 1(-) state arising from the
coupling of the first quadrupole and the first octupole phonon, and one
1(+) state arising from the coupling of the first and the second
quadrupole phonon, where the latter has isovector character. Such an
excitation mode can be considered as an analogue of the scissors mode in
vibrational nuclei. The calculated transition strengths are compatible
with experimental ones within a factor of about 1.5. (C) 1997 Elsevier
Science B.V.
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