Extraction of thermalized projectile fragments from gas
Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
2 National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, 48824, USA
Published online: 8 December 2007
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 stopping 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.
PACS: 29.25.Rm – Sources of radioactive nuclei / 52.20.Hv – Heavy ions in weak plasma
© EDP Sciences, Springer-Verlag, 2007