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

• Published in: Europhysics letters Vol. 104; no. 4; pp. 42001 - 42006
• Main Authors: 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.
• Format: Journal Article
• Language: English
• Published: EDP Sciences, IOP Publishing and Società Italiana di Fisica 01-11-2013
• Subjects: 29.25.Rm; 29.30.Aj; 29.38.Db
• ISSN: 0295-5075; 1286-4854
• DOI: 10.1209/0295-5075/104/42001

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.