Heavy ion separation with a gas-filled magnetic spectrograph

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Abstract

Heavy ions passing through a magnetic field region filled with gas experience atomic charge-changing collisions and follow trajectories approximately determined by the mean charge state in the gas. The properties of a gas-filled Enge magnetic spectrograph are studied in detail by measuring focal-plane position spectra of fast heavy ions and their evolution as a function of gas pressure. The method allows physical separation of pairs of isobaric ions in the focal plane. Applications in accelerator mass spectrometry 0experiments are described. At intermediate low pressures, single atomic charge-changing processes can be identified. A Monte Carlo simulation program of the ion transport through the gas-filled magnet is developed and reproduces closely the experimental behavior.

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    §§

    Work supported by the US Department of Energy, Nuclear Physics Division, under Contract W-31-109-ENG-38.

    ∗

    Permanent address: Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel.

    ∗∗

    Permanent address: GSI Darmstadt, D-6100 Darmstadt, FRG.

    +

    On leave from Institute of Modern Physics, Lanzhou, People's Republic of China.

    ++

    On leave from Physics Department, Technical University of Munich, D-8046 Garching, FRG.

    §

    Permanent address: Rijksuniversiteit, Groningen, The Netherlands.

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    Copyright © 1989 Published by Elsevier B.V.