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  • Improved limit on the directly measured antiproton lifetime 
    Sellner, S.; Besirli, M.; Bohman, M.; Borchert, M.J.; Harrington, J.; Higuchi, T.; Mooser, A.; Nagahama, H.; Schneider, G.; Smorra, C.; Tanaka, T.; Blaum, K.; Matsuda, Y.; Ospelkaus, C.; Quint, W.; Walz, J.; Yamazaki, Y.; Ulmer, S. (Bristol : Institute of Physics Publishing, 2017)
    Continuous monitoring of a cloud of antiprotons stored in a Penning trap for 405 days enables us to set an improved limit on the directly measured antiproton lifetime. From our measurements we extract a storage time of ...
  • Measurement of Ultralow Heating Rates of a Single Antiproton in a Cryogenic Penning Trap 
    Borchert, M.J.; Blessing, P.E.; Devlin, J.A.; Harrington, J.A.; Higuchi, T.; Morgner, J.; Smorra, C.; Wursten, E.; Bohman, M.; Wiesinger, M.; Mooser, A.; Blaum, K.; Matsuda, Y.; Ospelkaus, C.; Quint, W.; Walz, J.; Yamazaki, Y.; Ulmer, S. (College Park, MD : American Physical Society, 2019)
    We report on the first detailed study of motional heating in a cryogenic Penning trap using a single antiproton. Employing the continuous Stern-Gerlach effect we observe cyclotron quantum transition rates of 6(1) quanta/h ...
  • Observation of individual spin quantum transitions of a single antiproton 
    Smorra, C.; Mooser, A.; Besirli, M.; Bohman, M.; Borchert, M.J.; Harrington, J.; Higuchi, T.; Nagahama, H.; Schneider, G.L.; Sellner, S.; Tanaka, T.; Blaum, K.; Matsuda, Y.; Ospelkaus, C.; Quint, W.; Walz, J.; Yamazaki, Y.; Ulmer, S. (Amsterdam : Elsevier BV, 2017)
    We report on the detection of individual spin quantum transitions of a single trapped antiproton in a Penning trap. The spin-state determination, which is based on the unambiguous detection of axial frequency shifts in ...
  • A parts-per-billion measurement of the antiproton magnetic moment 
    Smorra, C.; Sellner, S.; Borchert, M. J.; Harrington, J. A.; Higuchi, T.; Nagahama, H.; Tanaka, T.; Mooser, A.; Schneider, G.; Bohman, M.; Blaum, K.; Matsuda, Y.; Ospelkaus, C.; Quint, W.; Walz, J.; Yamazaki, Y.; Ulmer, S. (London : Nature Publishing Group, 2017)
    Precise comparisons of the fundamental properties of matter-antimatter conjugates provide sensitive tests of charge-parity-time (CPT) invariance(1), which is an important symmetry that rests on basic assumptions of the ...
  • Sympathetic cooling of a trapped proton mediated by an LC circuit 
    Bohman, M.; Grunhofer, V.; Smorra, C.; Wiesinger, M.; Will, C.; Borchert, M.J.; Devlin, J.A.; Erlewein, S.; Fleck, M.; Gavranovic, S.; Harrington, J.; Latacz, B.; Mooser, A.; Popper, D.; Wursten, E.; Blaum, K.; Matsuda, Y.; Ospelkaus, C.; Quint, W.; Walz, J.; Ulmer, S. (London [u.a.] : Nature Publ. Group, 2021)
    Efficient cooling of trapped charged particles is essential to many fundamental physics experiments1,2, to high-precision metrology3,4 and to quantum technology5,6. Until now, sympathetic cooling has required close-range ...