First experimental results of a cryogenic stopping cell with short-lived, heavy uranium fragments produced at 1000 MeV/u

S. Purushothaman, M. P. Reiter, E. Haettner, P. Dendooven, T. Dickel, H. Geissel, J. Ebert, C. Jesch, W. R. Plass, M. Ranjan, H. Weick, F. Amjad, S. Ayet, M. Diwisch, A. Estrade, F. Farinon, F. Greiner, N. Kalantar-Nayestanaki, R. Knöbel, J. KurcewiczJ. Lang, I. D. Moore, I. Mukha, C. Nociforo, M. Petrick, M. Pfützner, S. Pietri, A. Prochazka, A. K. Rink, S. Rinta-Antila, C. Scheidenberger, M. Takechi, Y. K. Tanaka, J. S. Winfield, M. I. Yavor

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Abstract

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 -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.

Original languageEnglish
Article number42001
JournalEPL
Volume104
Issue number4
DOIs
StatePublished - Nov 2013

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