First experimental results of a cryogenic stoppingcell with short-lived, heavy uranium fragmentsproduced at 1000 MeV/u

Sivaji 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 Peterick, M. Pfützner, S. Pietri, A. Prochazka, A K Rink, S Rinta-Antila, C Sheidenberger, M. Takechi, Yoshiki K. Tanaka, J.S. Winfield, M. I. Yavor

Research output: Contribution to journalLetterpeer-review

Abstract

A cryogenic stopping cell (CSC) has been commissioned with238U projectile frag-ments produced at 1000 MeV/u. The spatial isotopic separation in flight was performed with theFRS applying a monoenergetic degrader. For the first time, a stopping cell was operated withexotic nuclei at cryogenic temperatures (70 to 100 K). A helium stopping gas density of up to0.05 mg/cm3was used, about two times higher than reached before for a stopping cell with RF ionrepelling structures. An overall efficiency of up to 15%, a combined ion survival and extractionefficiency of about 50%, and extraction times of 24 ms were achieved for heavyα-decaying ura-nium fragments. Mass spectrometry with a multiple-reflection time-of-flight mass spectrometerhas demonstrated the excellent cleanliness of the CSC. This setup has opened a new field for thespectroscopy of short-lived nuclei.
Original languageEnglish
JournalEurophysics Letters
Volume104
Issue number4
DOIs
Publication statusPublished - 16 Dec 2013

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