Volume 104, Number 4, November 2013
|Number of page(s)||6|
|Published online||17 December 2013|
First experimental results of a cryogenic stopping cell with short-lived, heavy uranium fragments produced at 1000 MeV/u
1 GSI Helmholtzzentrum für Schwerionenforschung GmbH - 64291 Darmstadt, Germany
2 II. Physikalisches Institut, Justus-Liebig-Universität Gießen - 35392 Gießen, Germany
3 KVI, University of Groningen - 9747 AA Groningen, The Netherlands
4 University of Jyväskylä - FI-40014 Jyväskylä, Finland
5 Faculty of Physics, University of Warsaw, - 00-681 Warszawa Poland
6 Institute for Analytical Instrumentation, Russian Academy of Sciences - 190103 St. Petersburg, Russia
Received: 11 September 2013
Accepted: 19 November 2013
A cryogenic stopping cell (CSC) has been commissioned with 238U projectile fragments produced at 1000 MeV/u. The spatial isotopic separation in flight was performed with the FRS applying a monoenergetic degrader. For the first time, a stopping cell was operated with exotic nuclei at cryogenic temperatures (70 to 100 K). A helium stopping gas density of up to was used, about two times higher than reached before for a stopping cell with RF ion repelling structures. An overall efficiency of up to 15%, a combined ion survival and extraction efficiency of about 50%, and extraction times of 24 ms were achieved for heavy α-decaying uranium fragments. Mass spectrometry with a multiple-reflection time-of-flight mass spectrometer has demonstrated the excellent cleanliness of the CSC. This setup has opened a new field for the spectroscopy of short-lived nuclei.
PACS: 29.38.Db – Fast radioactive beam techniques / 29.30.Aj – Charged-particle spectrometers: electric and magnetic / 29.25.Rm – Sources of radioactive nuclei
© EPLA, 2013
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