Change of the dipole strength distributions between the neighboring Gamma-soft nuclei 194Pt and 196Pt

Linnemann, A.; Brentano, P. von; Eberth, J.; Enders, J.; Fitzler, A.; Fransen, C.; Guliyev, E.; Herzberg, R.-D.; Käubler, L.; Kuliev, A. A.; Neumann-Cosel, P. von; Pietralla, N.; Prade, H.; Richter, A.; Schwengner, R.; Thomas, H. G.; Weisshaar, D.; Wiedenhöver, I.

Change of the dipole strength distributions between the neighboring Gamma-soft nuclei 194Pt and 196Pt

Linnemann, A.; von Brentano, P.; Eberth, J.; Enders, J.; Fitzler, A.; Fransen, C.; Guliyev, E.; Herzberg, R.-D.; Käubler, L.; Kuliev, A. A.; von Neumann-Cosel, P.; Pietralla, N.; Prade, H.; Richter, A.; Schwengner, R.; Thomas, H. G.; Weisshaar, D.; Wiedenhöver, I.

A nuclear resonance fluorescence experiment with two highly efficient EUROBALL Cluster detectors has been performed on the Gamma-soft nucleus 194Pt. Dipole excitations were observed between 2 and 4 MeV excitation energy. They are tentatively interpreted as the main fragments of the scissors mode based on the measurec excitation strengths and a comparison to microscopic calculations in the framework of the quasiparticle random phase approximation (QRPA). The data indicate large differences to the neighbouring isotope 196Pt: a doublingof the observed dipole strength and a shift of the energy centroid by about 600 keV. None of the currently available models is able to reproduce these features consistently in both nuclei.

Keywords: ¹⁹⁴Pt(γ,γ′); Observed dipole strength for Eₓ ≤ 4 MeV; Deduced M1 scissors mode strength and energy centroid; Comparison to ¹⁹⁴Pt

Physic letters B 554(2003)15-20

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