Abstract.
The NSCL gas cell and quadrupole ion-guide system has been used to study the thermalization of fast nuclear reaction products in a buffer gas. The fraction of radioactive ions that can be extracted from the gas cell is dramatically suppressed by space charge created by the stop** ions. The results of a review of the ion yields from the NSCL and from other gas cells from the literature with different sizes and different incident particle energies shows an overall consistency with a dramatic decline in extraction efficiency at high ionization rates.
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Morrissey, D. Extraction of thermalized projectile fragments from gas. Eur. Phys. J. Spec. Top. 150, 365–366 (2007). https://doi.org/10.1140/epjst/e2007-00348-7
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DOI: https://doi.org/10.1140/epjst/e2007-00348-7