The performance of the cryogenic buffer-gas stopping cell of SHIPTRAP

Kaleja, O.; Anđelić, B.; Blaum, K.; Block, M.; Chhetri, P.; Droese, C.; Düllmann, Ch. E.; Eibach, M.; Eliseev, S.; Evend, J.; Götz, S.; Giacoppo, F.; Kalantar-Nayestanaki, N.; Laatiaoui, M.; Ramirez, E. Minaya; Murböck, A. Mistry T.; Raeder, S.; Schweikhard, L.; Thirolf, P. G.

doi:10.1016/j.nimb.2019.05.009

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The performance of the cryogenic buffer-gas stopping cell of SHIPTRAP

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Kaleja, O.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Eliseev, S.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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https://doi.org/10.1016/j.nimb.2019.05.009
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Citation

Kaleja, O., Anđelić, B., Blaum, K., Block, M., Chhetri, P., Droese, C., et al. (2020). The performance of the cryogenic buffer-gas stopping cell of SHIPTRAP. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 463, 280-285. doi:10.1016/j.nimb.2019.05.009.

Cite as: https://hdl.handle.net/21.11116/0000-0005-A39D-2

Abstract

Direct high-precision mass spectrometry of the heaviest elements with SHIPTRAP, at GSI in Darmstadt, Germany, requires high efficiency to deal with the low production rates of such exotic nuclides. A second-generation gas stopping cell, operating at cryogenic temperatures, was developed and recently integrated into the relocated system to boost the overall efficiency. Offline measurements using ²²³Ra and ²²⁵Ac recoil-ion sources placed inside the gas volume were performed to characterize the gas stopping cell with respect to purity and extraction efficiency. In addition, a first online test using the fusion-evaporation residue ²⁵⁴No was performed, resulting in a combined stopping and extraction efficiency of 33(5)%. An extraction time of 55(44) ms was achieved. The overall efficiency of SHIPTRAP for fusion-evaporation reaction products was increased by an order of magnitude to 6(1)%. This will pave the way for direct mass spectrometry of heavier and more exotic nuclei, eventually in the region of superheavy elements with proton numbers .