First experimental results of a cryogenic stopping cell with short-lived, heavy uranium fragments produced at 1000 MeV/u
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 temper...
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| Veröffentlicht in: | Europhysics letters 2013-11, Vol.104 (4), p.1-1 |
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| creator | Purushothaman, S Reiter, M P Haettner, E Dendooven, P Dickel, T Geissel, H Ebert, J Jesch, C Plaß, W R Ranjan, M Weick, H Amjad, F Ayet, S Diwisch, M Estrade, A Farinon, F Greiner, F Kalantar-Nayestanaki, N Knöbel, R Kurcewicz, J Lang, J Moore, I D Mukha, I Nociforo, C Petrick, M Pfützner, M Pietri, S Prochazka, A Rink, A-K Rinta-Antila, S Scheidenberger, C Takechi, M Tanaka, Y K Winfield, J S Yavor, M I |
| description | 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 100K). A helium stopping gas density of up to 0.05mg/cm3 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 24ms 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. |
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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 100K). A helium stopping gas density of up to 0.05mg/cm3 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 24ms 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.</abstract><cop>Les Ulis</cop><pub>IOP Publishing</pub><tpages>1</tpages></addata></record> |
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| subjects | Extraction Fragments Gas density Mass spectrometers Mass spectrometry Nuclei Survival Uranium |
| title | First experimental results of a cryogenic stopping cell with short-lived, heavy uranium fragments produced at 1000 MeV/u |
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