Measurements of isotope shifts of accelerator-produced radioactive atoms in an on-line resonance cell

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Abstract

Fluorescence spectra from atoms of radioactive nuclides produced by heavy-ion fusion reactions have been measured on line with a gas-filled, liquid-nitrogen-cooled resonance cell. This device yields useful spectra from Yb nuclides produced at rates lower than 1000 s−1. Spectra have now been obtained for Yb isotopes more than 18 neutrons away from the line of β stability. These data show a large isotope shift surprisingly near the N = 82 shell closure. The apparatus has also been used to measure isotope shifts of the refractory element Hf.

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Supported by the National Science Foundation.

1

Now at Kernfysisch Versneller Instituut, Groningen, The Netherlands

2

Now at Los Alamos National Laboratory, Los Alamos, NM, USA.

3

Now at Argonne National Laboratory, Argonne, IL, USA.

4

Now at University of Manchester, Manchester, UK.

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