Two-phonon J = 1 states in even-mass Te isotopes with A = 122-130

R. Schwengner, G. Winter, W. Schauer, M. Grinberg, F. Becker, P. Von Brentano, J. Eberth, J. Enders, T. Von Egidy, R. D. Herzberg, N. Huxel, L. Käubler, P. Von Neumann-Cosel, N. Nicolay, J. Ott, N. Pietralla, H. Prade, S. Raman, J. Reif, A. RichterC. Schlegel, H. Schnare, T. Servene, S. Skoda, T. Steinhardt, C. Stoyanov, H. G. Thomas, I. Wiedenhöver, A. Zilges

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57 Scopus citations

Abstract

Excited states of the nuclei 122,126,130Te were populated via the (γ,γ′) 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 Eγ ≈ 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.

Original languageEnglish
Pages (from-to)277-295
Number of pages19
JournalNuclear Physics, Section A
Volume620
Issue number3
DOIs
StatePublished - 14 Jul 1997

Keywords

  • E = 4.5 MeV, Te(γ,γ′)
  • E = 4.5 MeV, Te(γ,γ′)
  • Nuclear reactions Te(γ,γ′)

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