Ion-source development at the 252Cf ISOL facility

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Abstract

The ISOL system at the INEL utilizes the He-gas-jet technique to transport fission products from 252Cf spontaneous-fission sources to the ion source of an electromagnetic mass separator. A long-lived, gas-jet-coupled ion source for production of rare-earth, fission-product ion beams has been developed and implemented in this system. This paper describes the ion source, its operating parameters and its implementation in the search for new rare-earth element isotopes. New isotopes observed, with preliminary values of their half-lives in parentheses, are 153Pr (4.2 s), 155Nd (8.9 s), 156Nd (5.5 s), 157Pm (10.9 s), 158Pm (4.3 s) and 162Eu (11.0 s). Total separation efficiencies (based on the ratio of radionuclide activity collected at the focal plane of the mass separator to radionuclide activity generated by the 252Cf source) were estimated to be approximately 1% for 154Pm and 1% for 158Sm.

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    Work supported by the US Department of Energy under contract No. DE-AC07-76IDO1570 with EG&G Idaho, Inc.

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