51. First identification of large electric monopole strength in well-deformed rare earth nuclei
- Author
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Wimmer, K., Bildstein, V., Eppinger, K., Gernhäuser, R., Habs, D., Hinke, Ch., Kröll, Th., Krücken, R., Lutter, R., Maier, H. -J., Maierbeck, P., Morgan, Th., Schaile, O., Schwerdtfeger, W., Schwertel, S., and Thirolf, P. G.
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Nuclear Experiment - Abstract
Excited states in the well-deformed rare earth isotopes $^{154}$Sm and $^{166}$Er were populated via ``safe'' Coulomb excitation at the Munich MLL Tandem accelerator. Conversion electrons were registered in a cooled Si(Li) detector in conjunction with a magnetic transport and filter system, the Mini-Orange spectrometer. For the first excited $0^+$ state in $^{154}$Sm at 1099 keV a large value of the monopole strength for the transition to the ground state of $\rho^2(\text{E0}; 0^+_2 \to 0^+_\text{g}) = 96(42)\cdot 10^{-3}$ could be extracted. This confirms the interpretation of the lowest excited $0^+$ state in $^{154}$Sm as the collective $\beta$-vibrational excitation of the ground state. In $^{166}$Er the measured large electric monopole strength of $\rho^2(\text{E0}; 0^+_4 \to 0^+_1) = 127(60)\cdot 10^{-3}$ clearly identifies the $0_4^+$ state at 1934 keV to be the $\beta$-vibrational excitation of the ground state., Comment: submitted to Physics Letters B
- Published
- 2008
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