First identification of large electric monopole strength in well-deformed rare earth nuclei
Abstract
Excited states in the well-deformed rare earth isotopes 154Sm and 166Er 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 154Sm at 1099 keV a large value of the monopole strength for the transition to the ground state of 2(E0; 0+2 0+g) = 96(42)· 10-3 could be extracted. This confirms the interpretation of the lowest excited 0+ state in 154Sm as the collective β-vibrational excitation of the ground state. In 166Er the measured large electric monopole strength of 2(E0; 0+4 0+1) = 127(60)· 10-3 clearly identifies the 04+ state at 1934 keV to be the β-vibrational excitation of the ground state.
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