Development of the helium-jet fed on-line mass separator RAMA, I

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Abstract

Development of general experimental systems capable of mass analysis of radioactive species with half-lives as short as 50 ms and with simple application to a vast majority of the chemical elements is clearly of great interest in the study of nuclei far from stability. Such an on-line system has been developed which employs a helium-jet to transport activity from the target area to a mass separator. The initial development and early experiment use of this recoil atom mass analysis system (RAMA) are described. RAMA as a typical total efficiency of 0.01%, which should apply to ∼75 elements of melting point <2000°C. This efficiency is for a mass resolution MΔM ∼ 200.

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    This work was supported by the Nuclear Physics and Nuclear Sciences Divisions of the US Department of Energy under contract No. W-7405-ENG-48.

    ∗∗

    Present Address: Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545 USA.

    Permanent Address: Physics Department, Queen's University, Kingston, Ontario, Canada.

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