Freiburg 2024 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 5: Heavy and Superheavy Nuclei
MS 5.7: Talk
Wednesday, March 13, 2024, 12:45–13:00, HS 3042
Designing a compact buffer-gas cell for recoil-ion sources for the SHIPTRAP experiment — •Jaykumar Patel1,2, Michael Block1,3,4, Francesca Giacoppo1,4, Manuel J. Gutiérrez1,4,5, and Alexandre Obertelli6,7 — 1GSI, Darmstadt, Germany — 2TUD, Darmstadt, Germany — 3JGU, Mainz, Germany — 4HIM, Mainz, Germany — 5University of Greifswald, Germany — 6IKP, TU Darmstadt, Germany — 7RIKEN Nishina centre, Japan
Masses of transuranium nuclides, for example around the N=152 deformed shell gap are pivotal for understanding shell evolution and nuclear structure in that region. By combining α decay energies and direct mass measurements e.g. from SHIPTRAP and RIKEN-KEK, various masses in this region have already been determined. However, expecting extended regions of enhanced stability, the shell gap evolution in different isotopic chains is of interest. Mass measurements on long lived isotopes can be performed with high precision with Penning traps by using different ion sources. Currently used laser-ablation ion sources need large sample sizes, which is unsuitable for transuranium isotopes. This can be overcome by recoil ion sources where the recoil ions from α decays can be used for mass measurements. This work aims at building a compact buffer gas cell in which recoil ions are stopped at low energies for efficient transport to the Penning trap. The cell with a funnel-type electrode system will operate at room temperature with He gas at pressures around 50 mbar. This setup, enabling offline measurements of certain isotopes, can serve as a reference for mass measurements of superheavy element at SHIPTRAP, GSI Darmstadt.
Keywords: Recoil Ion source; Buffer gas cell; direct mass measurements; Ion-funnel system; Ion-tranjectory simulations