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

Kaleja, O., Andelic, B., Blaum, K., Block, M., Chhetri, P., Droese, C., Düllmann, C. E., Eibach, M., Eliseev, S., Even, J., Götz, S., Giacoppo, F., Kalantar-Nayestanaki, N., Mistry, A. K., Murböck, T., Raeder, S. & Schweikhard, L., 15-Jan-2020, In : Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms. 463, p. 280-285 6 p.

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

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DOI

  • O. Kaleja
  • B. Andelic
  • K. Blaum
  • M. Block
  • P. Chhetri
  • C. Droese
  • Ch E. Düllmann
  • M. Eibach
  • S. Eliseev
  • J. Even
  • S. Götz
  • Francesca Giacoppo
  • N. Kalantar-Nayestanaki
  • Andrew Kishor Mistry
  • T. Murböck
  • Sebastian Raeder
  • L. Schweikhard
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 223 Ra and 225 Ac 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 254 No 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 Z⩾104.
Original languageEnglish
Pages (from-to)280-285
Number of pages6
JournalNuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms
Volume463
Early online date10-May-2019
Publication statusPublished - 15-Jan-2020

    Keywords

  • Cryogenic gas stopping cell, Extraction time, Fusion-evaporation reaction products, Mass spectrometry, Penning traps, Stopping and extraction efficiency, Transfermium elements, nobelium, DIRECT MASS MEASUREMENTS, HEAVIEST ELEMENTS, SPECTROSCOPY, IONIZATION, CALIBRATION, NOBELIUM

ID: 84987094